Canon RF 100-400mm f/5.6-8 Is USM Lens
All-Round Zoom The RF100-400mm f/5.6-8 IS USM has a large focal coverage from 100mm to 400mm. Compatible with both Extender RF 1.4x and Extender RF 2x, the effective range can be increased to 560mm and 800mm respectively. 0.41x Magnification Through the RF mount design, the RF100-400mm f/5.6-8 IS USM has a short minimum focusing distance allowing it to achieve 0.41x magnification. Image Stabilisation Natively, the RF100-400mm f/5.6-8 IS USM can achieve up to 5.5 stops image stabilisation. When paired with a compatible camera, the 5-axis In-Body Image Stabilizer (In-Body IS) and the In-Lens Optical Image Stabilizer (Optical IS) provide Coordinated Control Image Stabilisation (IS) capable of up to 6 stops of image stabilisation. Nano USM This compact ultrasonic motor provides high-speed AF. The innovative AF actuator is suitable for high-precision micro-driving and delivers high performance even during movie recording and live-view shooting. Lens Layout The introduction of the RF mount has enabled the RF100-400mm f/5.6-8 IS USM to deliver high image quality in a lightweight and compact design. UD Lens This lens uses a single Ultra Low Dispersion (UD) lens element with low refraction and low dispersion that reduces chromatic aberrations to deliver higher image quality.
All-Round Zoom The RF100-400mm f/5.6-8 IS USM has a large focal coverage from 100mm to 400mm. Compatible with both Extender RF 1.4x and Extender RF 2x, the effective range can be increased to 560mm and 800mm respectively. 0.41x Magnification Through the RF mount design, the RF100-400mm f/5.6-8 IS USM has a short minimum focusing distance allowing it to achieve 0.41x magnification. Image Stabilisation Natively, the RF100-400mm f/5.6-8 IS USM can achieve up to 5.5 stops image stabilisation. When paired with a compatible camera, the 5-axis In-Body Image Stabilizer (In-Body IS) and the In-Lens Optical Image Stabilizer (Optical IS) provide Coordinated Control Image Stabilisation (IS) capable of up to 6 stops of image stabilisation. Nano USM This compact ultrasonic motor provides high-speed AF. The innovative AF actuator is suitable for high-precision micro-driving and delivers high performance even during movie recording and live-view shooting. Lens Layout The introduction of the RF mount has enabled the RF100-400mm f/5.6-8 IS USM to deliver high image quality in a lightweight and compact design. UD Lens This lens uses a single Ultra Low Dispersion (UD) lens element with low refraction and low dispersion that reduces chromatic aberrations to deliver higher image quality.
All-Round Zoom The RF100-400mm f/5.6-8 IS USM has a large focal coverage from 100mm to 400mm. Compatible with both Extender RF 1.4x and Extender RF 2x, the effective range can be increased to 560mm and 800mm respectively. 0.41x Magnification Through the RF mount design, the RF100-400mm f/5.6-8 IS USM has a short minimum focusing distance allowing it to achieve 0.41x magnification. Image Stabilisation Natively, the RF100-400mm f/5.6-8 IS USM can achieve up to 5.5 stops image stabilisation. When paired with a compatible camera, the 5-axis In-Body Image Stabilizer (In-Body IS) and the In-Lens Optical Image Stabilizer (Optical IS) provide Coordinated Control Image Stabilisation (IS) capable of up to 6 stops of image stabilisation. Nano USM This compact ultrasonic motor provides high-speed AF. The innovative AF actuator is suitable for high-precision micro-driving and delivers high performance even during movie recording and live-view shooting. Lens Layout The introduction of the RF mount has enabled the RF100-400mm f/5.6-8 IS USM to deliver high image quality in a lightweight and compact design. UD Lens This lens uses a single Ultra Low Dispersion (UD) lens element with low refraction and low dispersion that reduces chromatic aberrations to deliver higher image quality.
All-Round Zoom The RF100-400mm f/5.6-8 IS USM has a large focal coverage from 100mm to 400mm. Compatible with both Extender RF 1.4x and Extender RF 2x, the effective range can be increased to 560mm and 800mm respectively. 0.41x Magnification Through the RF mount design, the RF100-400mm f/5.6-8 IS USM has a short minimum focusing distance allowing it to achieve 0.41x magnification. Image Stabilisation Natively, the RF100-400mm f/5.6-8 IS USM can achieve up to 5.5 stops image stabilisation. When paired with a compatible camera, the 5-axis In-Body Image Stabilizer (In-Body IS) and the In-Lens Optical Image Stabilizer (Optical IS) provide Coordinated Control Image Stabilisation (IS) capable of up to 6 stops of image stabilisation. Nano USM This compact ultrasonic motor provides high-speed AF. The innovative AF actuator is suitable for high-precision micro-driving and delivers high performance even during movie recording and live-view shooting. Lens Layout The introduction of the RF mount has enabled the RF100-400mm f/5.6-8 IS USM to deliver high image quality in a lightweight and compact design. UD Lens This lens uses a single Ultra Low Dispersion (UD) lens element with low refraction and low dispersion that reduces chromatic aberrations to deliver higher image quality.
in 33 offers
The lowest price for Canon RF 100-400mm f/5.6-8 Is USM Lens right now is $954.00 at Kogan.com, compared across 22 retailers.
The all-time low was $635.68 on 21 Feb 2026 — today's price is 50% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 9 June 2026.
Last updated at 09/06/2026 18:08:00
Canon RF 100-400 f5.6-f8 is Lens - AU Version
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Canon RF 100-400mm F/5.6-8 IS USM Lens
Free delivery
Canon RF 100-400mm f/5.6-8 IS USM Lens
Free delivery
Canon RF 100-400mm F/5.6-8 IS USM Lens
Free delivery
Canon RF 100-400mm f/5.6-8 IS USM Lens
Free delivery between 15–22 June
Canon RF 100-400mm F/5.6-8 IS USM Lens SPOT DEAL
Delivery $14.95
Canon RF 100-400mm f/5.6-8 IS USM Lens
Delivery between 12–17 June $12.90
Canon RF 100-400mm f/5.6-8 IS USM Lens
Delivery between 15–18 June $21.20
Canon RF 100-400mm f/5.6-8 IS USM Lens
Delivery between 16–24 June $9.90
Canon RF 100-400mm f/5.6-8 IS USM Lens
Delivery between 16–18 June $8.95
originally posted on bhphotovideo.com
I am a photo enthusiast with a variety of theme interests and a relatively active outdoors life. I am shooting with an EOS R and a telephoto zoom was the last piece missing from my equipment list. Although I did invest in the RF 15-35 F2.8L to cover all my potential wide-angle landscape and astrophotography needs, I have long struggled to restrain myself from investing in the excellent (according to all reviews) RF 100-500 L. The reason being size and weight and how to deal with them in long trecks and anticipating that this RF 100-400 would provide a good enough quality at a much more portable package.When this lens became available and upon finding out that it would be compatible with extenders, preordering was an instant decision. For my needs it is excellent. ... MoreI am a photo enthusiast with a variety of theme interests and a relatively active outdoors life. I am shooting with an EOS R and a telephoto zoom was the last piece missing from my equipment list. Although I did invest in the RF 15-35 F2.8L to cover all my potential wide-angle landscape and astrophotography needs, I have long struggled to restrain myself from investing in the excellent (according to all reviews) RF 100-500 L. The reason being size and weight and how to deal with them in long trecks and anticipating that this RF 100-400 would provide a good enough quality at a much more portable package.When this lens became available and upon finding out that it would be compatible with extenders, preordering was an instant decision. For my needs it is excellent. It is truly a very portable lens, it shoots handheld even at 400mm with the 2x extender on and produces lovely images. For my trecking outings, the RF 15-35 2.8L, this RF 100-400, and a 2x extender, give me a practical coverage from 15 to 800mm. The gap from 35 to 100 is not something that I usually need in my landscape shots or that I cannot cover with a couple of steps back or forth.The 100-400 works quite good for macro shots as well, for my needs. I am absolutely thrilled with the results the usabillity and the overall cost.
originally posted on bhphotovideo.com
I have this lens on my Canon R7. So, I have an effective field of view of 160mm-640mm. This lens covers such a wide focal length on a crop sensor which makes it perfect for wildlife and sports. However, this lens can be used for so much more.Although it may be considered a slow lens, ISO performance of cameras have come a long way. So, there's no need to feel leery about a 6.3 aperture. Surprisingly, and not thought of as such, but this lens can also be used as a portrait lens. With such a great range of focal length, take advantage of is by zooming into your subject. The lens renders beautiful looking backgrounds and combined with telephoto compression; you'll get excellent separation of your subject to background.It's a light lens which might make one feel ... MoreI have this lens on my Canon R7. So, I have an effective field of view of 160mm-640mm. This lens covers such a wide focal length on a crop sensor which makes it perfect for wildlife and sports. However, this lens can be used for so much more.Although it may be considered a slow lens, ISO performance of cameras have come a long way. So, there's no need to feel leery about a 6.3 aperture. Surprisingly, and not thought of as such, but this lens can also be used as a portrait lens. With such a great range of focal length, take advantage of is by zooming into your subject. The lens renders beautiful looking backgrounds and combined with telephoto compression; you'll get excellent separation of your subject to background.It's a light lens which might make one feel like they are not holding something that's built well. However, don't be fooled. The lens is built well enough to take it in most types of weather. I would not use this lens in a steady rain without a raincoat over the lens though.Focusing is surprisingly fast, quiet and accurate on the R7 which makes it ideal to catch those fleeting moments.If you are looking for an affordable, lightweight, fast focusing and versatile zoom lens look no further and click the add to cart icon.As per the norm, BH Photo is number one for accuracy of search on their website, product in-stock selection and service. It's always a pleasure to do business with them.
originally posted on bestbuy.ca
So yeah, mine was stolen and I got someone's used and damaged EF 75-300mm lens instead. Customer service sent me on a wild goose chase since there is no way to prove anything, so I'm down $800+ and had to re-buy the lens elsewhere.It appears none of the RF lens boxes are sealed, so there is always a risk of someone tampering with the product and removing the serial number label and documentation to make it impossible to track. Maybe a store employee improperly checked the thief's return. Maybe they put an open box item with the new items since there is no way to tell them apart from the outside. Who knows?Some people might think stealing is sticking it to the corporations, especially since there was some animosity towards Canon for changing their lens platform ... MoreSo yeah, mine was stolen and I got someone's used and damaged EF 75-300mm lens instead. Customer service sent me on a wild goose chase since there is no way to prove anything, so I'm down $800+ and had to re-buy the lens elsewhere.It appears none of the RF lens boxes are sealed, so there is always a risk of someone tampering with the product and removing the serial number label and documentation to make it impossible to track. Maybe a store employee improperly checked the thief's return. Maybe they put an open box item with the new items since there is no way to tell them apart from the outside. Who knows?Some people might think stealing is sticking it to the corporations, especially since there was some animosity towards Canon for changing their lens platform and making EF lenses obsolete. But in the end, it is the customer who loses while the corporations walk away with the money. Therefore, DO NOT STEAL.
| Mount | RF |
| Focal Length | 100-400mm |
| Minimum Focusing Distance | 0.88 (at 200mm) |
| Maximum Magnification | 0.41x (at 400mm) |
| Lens Construction | 12 elements in 9 groups |
Canon RF 100-400 f5.6-f8 is Lens - AU Version
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Canon RF 100-400mm F/5.6-8 IS USM Lens
Free delivery
Canon RF 100-400mm f/5.6-8 IS USM Lens
Free delivery
Canon RF 100-400mm F/5.6-8 IS USM Lens
Free delivery
Canon RF 100-400mm f/5.6-8 IS USM Lens
Free delivery between 15–22 June
I am a photo enthusiast with a variety of theme interests and a relatively active outdoors life. I am shooting with an EOS R and a telephoto zoom was the last piece missing from my equipment list. Although I did invest in the RF 15-35 F2.8L to cover all my potential wide-angle landscape and astrophotography needs, I have long struggled to restrain myself from investing in the excellent (according to all reviews) RF 100-500 L. The reason being size and weight and how to deal with them in long trecks and anticipating that this RF 100-400 would provide a good enough quality at a much more portable package.When this lens became available and upon finding out that it would be compatible with extenders, preordering was an instant decision. For my needs it is excellent. ... MoreI am a photo enthusiast with a variety of theme interests and a relatively active outdoors life. I am shooting with an EOS R and a telephoto zoom was the last piece missing from my equipment list. Although I did invest in the RF 15-35 F2.8L to cover all my potential wide-angle landscape and astrophotography needs, I have long struggled to restrain myself from investing in the excellent (according to all reviews) RF 100-500 L. The reason being size and weight and how to deal with them in long trecks and anticipating that this RF 100-400 would provide a good enough quality at a much more portable package.When this lens became available and upon finding out that it would be compatible with extenders, preordering was an instant decision. For my needs it is excellent. It is truly a very portable lens, it shoots handheld even at 400mm with the 2x extender on and produces lovely images. For my trecking outings, the RF 15-35 2.8L, this RF 100-400, and a 2x extender, give me a practical coverage from 15 to 800mm. The gap from 35 to 100 is not something that I usually need in my landscape shots or that I cannot cover with a couple of steps back or forth.The 100-400 works quite good for macro shots as well, for my needs. I am absolutely thrilled with the results the usabillity and the overall cost.
I have this lens on my Canon R7. So, I have an effective field of view of 160mm-640mm. This lens covers such a wide focal length on a crop sensor which makes it perfect for wildlife and sports. However, this lens can be used for so much more.Although it may be considered a slow lens, ISO performance of cameras have come a long way. So, there's no need to feel leery about a 6.3 aperture. Surprisingly, and not thought of as such, but this lens can also be used as a portrait lens. With such a great range of focal length, take advantage of is by zooming into your subject. The lens renders beautiful looking backgrounds and combined with telephoto compression; you'll get excellent separation of your subject to background.It's a light lens which might make one feel ... MoreI have this lens on my Canon R7. So, I have an effective field of view of 160mm-640mm. This lens covers such a wide focal length on a crop sensor which makes it perfect for wildlife and sports. However, this lens can be used for so much more.Although it may be considered a slow lens, ISO performance of cameras have come a long way. So, there's no need to feel leery about a 6.3 aperture. Surprisingly, and not thought of as such, but this lens can also be used as a portrait lens. With such a great range of focal length, take advantage of is by zooming into your subject. The lens renders beautiful looking backgrounds and combined with telephoto compression; you'll get excellent separation of your subject to background.It's a light lens which might make one feel like they are not holding something that's built well. However, don't be fooled. The lens is built well enough to take it in most types of weather. I would not use this lens in a steady rain without a raincoat over the lens though.Focusing is surprisingly fast, quiet and accurate on the R7 which makes it ideal to catch those fleeting moments.If you are looking for an affordable, lightweight, fast focusing and versatile zoom lens look no further and click the add to cart icon.As per the norm, BH Photo is number one for accuracy of search on their website, product in-stock selection and service. It's always a pleasure to do business with them.
So yeah, mine was stolen and I got someone's used and damaged EF 75-300mm lens instead. Customer service sent me on a wild goose chase since there is no way to prove anything, so I'm down $800+ and had to re-buy the lens elsewhere.It appears none of the RF lens boxes are sealed, so there is always a risk of someone tampering with the product and removing the serial number label and documentation to make it impossible to track. Maybe a store employee improperly checked the thief's return. Maybe they put an open box item with the new items since there is no way to tell them apart from the outside. Who knows?Some people might think stealing is sticking it to the corporations, especially since there was some animosity towards Canon for changing their lens platform ... MoreSo yeah, mine was stolen and I got someone's used and damaged EF 75-300mm lens instead. Customer service sent me on a wild goose chase since there is no way to prove anything, so I'm down $800+ and had to re-buy the lens elsewhere.It appears none of the RF lens boxes are sealed, so there is always a risk of someone tampering with the product and removing the serial number label and documentation to make it impossible to track. Maybe a store employee improperly checked the thief's return. Maybe they put an open box item with the new items since there is no way to tell them apart from the outside. Who knows?Some people might think stealing is sticking it to the corporations, especially since there was some animosity towards Canon for changing their lens platform and making EF lenses obsolete. But in the end, it is the customer who loses while the corporations walk away with the money. Therefore, DO NOT STEAL.
As a photography enthusiast, I have many Canon EF lenses. After I bought the Canon R6 mirrorless camera, I have been using Canon EF-to-R adapter to use my EF lenses.It works very well. But, when I travel, I found the EF 70-200/4L + EF1.4x extender was kind of heavy and the image stabilizer was not good enough for dark light. So I bought this lens, which are better in those 2 areas.This lens is not 'L' lens, I did not expect it to outperform my EF700-200/4L+EF1.4x combo. However, I did several real photo tests at 100-300mm range on Canon R6 camera, there was really no practical difference between these 2 set. This is a very good surprise!The 400mm side could be improved. That's why I only give it 4 stars, not 5.
The lens is light weight and does not need a tripod-ring. It is well made and feels solid in the hands. When there is plenty of light or sunshine the lens performs pretty well.I have used this lens for a few days now shooting my grandsons games and birds in the backyard this weekend and I am not very impressed. Even when I got a keeper, it was still vaguely out of focus or just not crisp.I use an R6.When shooting flagfooball yesterday my keeper ratio was terrible; something as low as 2 in ten were keepers. When it did miss focus, you could not determine where the camera was aiming; nothing was in focus. I was shooting handheld and it was a pretty bright day so there should have been plenty of sunshine. I also tested in lower light conditions, just overcast. It ... MoreThe lens is light weight and does not need a tripod-ring. It is well made and feels solid in the hands. When there is plenty of light or sunshine the lens performs pretty well.I have used this lens for a few days now shooting my grandsons games and birds in the backyard this weekend and I am not very impressed. Even when I got a keeper, it was still vaguely out of focus or just not crisp.I use an R6.When shooting flagfooball yesterday my keeper ratio was terrible; something as low as 2 in ten were keepers. When it did miss focus, you could not determine where the camera was aiming; nothing was in focus. I was shooting handheld and it was a pretty bright day so there should have been plenty of sunshine. I also tested in lower light conditions, just overcast. It was hit or miss in this situation.I also found it slow to focus and especially in low light.
For context, I should say that I am absolutely an amateur photographer and my lenses are all in the same category as this one, or cheaper. Also, this is the first 200mm lens I've ever had.That said, I find it has strengths that easily justify its price, and its weaknesses will probably fade as I get more practice with it.The stabilization is really good, but still for birds (not my main subject) you will still need to work hard to get your shots. For a lot of more stationary or at least less herky-jerky subjects, it's plenty.It's light in the sense of being lighter than similar lenses, but make no mistake: if you're holding your camera with one hand, after a while this lens will make that hand tired.It looks a little funny extended, but that's the fashion ... MoreFor context, I should say that I am absolutely an amateur photographer and my lenses are all in the same category as this one, or cheaper. Also, this is the first 200mm lens I've ever had.That said, I find it has strengths that easily justify its price, and its weaknesses will probably fade as I get more practice with it.The stabilization is really good, but still for birds (not my main subject) you will still need to work hard to get your shots. For a lot of more stationary or at least less herky-jerky subjects, it's plenty.It's light in the sense of being lighter than similar lenses, but make no mistake: if you're holding your camera with one hand, after a while this lens will make that hand tired.It looks a little funny extended, but that's the fashion now I guess. I got the cheap hood which works just fine. The control ring has turned out be be super useful on this lens -- much more than on the 35mm -- because changing the ISO is a regular thing when shooting any kind of action.I didn't buy it for portraits but I did take a few and they were pretty bad.So far though it looks very, very promising for my plans: urban photography (in a huge city, with a river) and landscapes (on a volcanic island), plus whatever weird things I see in the distance and want to shoot.I will echo the advice I got from many YouTubers and also from the experts at B&H in New York: if this is what you can afford, and you don't want to spend four times this much, then just get it.
The price went down so I went ahead and bought one for my RP. The lens is solid and light weight but to my surprise it's long and not compact. It focuses fast and you can override the focusing ring. A couple of negatives were was a hit or miss. Majority of images were soft after experimenting thru different settings, Av, Tv, P modes, changing shutter speeds and aperture settings. Video was sharp. I find I needed to use a high shutter speed to minimize shakiness at the max zoom range although the IS was on. Another concern was that when I zoomed fast there was a lag on the viewfinder. I have a Tamron 18-400 lens and although it's heavier it's almost the same length using the adapter and the pictures are sharper. In the end I returned the lens. I was a bit ... MoreThe price went down so I went ahead and bought one for my RP. The lens is solid and light weight but to my surprise it's long and not compact. It focuses fast and you can override the focusing ring. A couple of negatives were was a hit or miss. Majority of images were soft after experimenting thru different settings, Av, Tv, P modes, changing shutter speeds and aperture settings. Video was sharp. I find I needed to use a high shutter speed to minimize shakiness at the max zoom range although the IS was on. Another concern was that when I zoomed fast there was a lag on the viewfinder. I have a Tamron 18-400 lens and although it's heavier it's almost the same length using the adapter and the pictures are sharper. In the end I returned the lens. I was a bit disappointed because I really wanted a FF lens for the RP but the performance fell short.
The RF 100 - 400 5.6/8 IS USM offers Quality Optics beyond what the price point would indicate .. I have this lens paired to my R6 and it islike this lens was Made for the R6 .. The overall feel / balance and weight is a Perfect Match to the R6 .. RF 100 - 400 has a Solid Feel toit .. No Zoom Tension Adjustment on this lens , However , I find thatthe Feel / Resistance is Perfect as is .. Lens has combination STM and USM focus mechanics and this lens does in fact Focus INSTANTLY .. No Hunting / Breathing / Searching .. Snaps right into focus .. The Tracking Mode is nothing short of SPECTACULAR with this lens for both People as well as Animals down to and including Small Birds ..Images from this lens are SHARP .. CRISP .. CLEAN .. with Excellentand Accurate ... MoreThe RF 100 - 400 5.6/8 IS USM offers Quality Optics beyond what the price point would indicate .. I have this lens paired to my R6 and it islike this lens was Made for the R6 .. The overall feel / balance and weight is a Perfect Match to the R6 .. RF 100 - 400 has a Solid Feel toit .. No Zoom Tension Adjustment on this lens , However , I find thatthe Feel / Resistance is Perfect as is .. Lens has combination STM and USM focus mechanics and this lens does in fact Focus INSTANTLY .. No Hunting / Breathing / Searching .. Snaps right into focus .. The Tracking Mode is nothing short of SPECTACULAR with this lens for both People as well as Animals down to and including Small Birds ..Images from this lens are SHARP .. CRISP .. CLEAN .. with Excellentand Accurate Color Saturation .. When R6 is set to 1.6 crop this lensbecomes a 160 - 640 mm lens .. Focus / operation is Identical to setfor full frame .. Images show No Noticeable Deteriation in 16 x 20 prints when crop set.. I purchased this lens for Use / Situations in which I do Not want to Carry my 5d mk4 with the EF 100 - 400 5.6 Land I must say , I am Extremely Happy with the RF 100 - 400 5.6 / 8.This is a Lightweight Combination which can be Comfortably Carried ALL DAY , and yet Offers HIGH QUALITY images , at a BARGAIN PRICE.This is not an L series lens .. It does NOT cost almost $ 3,000 dollars ,But, aside from the Price .. the Weight .. the Size .. Most users will NOT , notice the Difference between this lens and the Vastly More Expensive 100 - 500 5.6 L .. Not everyone Needs nor can Afford an L series lens .. If you are Looking at the RF 100 - 400 5.6/8 ..Then this is Most Likely , The RIGHT lens for YOU ..
Canon's RF 100-400mm f/5.6-8 is perhaps the single greatest buy in the photography world today. They could have easily charged double the price. What you get for $500 is an outstanding optic, capable of producing simply phenomenal images. Read the reviews on line. They are near unanimous in singing the praises for this lens. Is it slow at f/8 at 400mm? Not really. Image stabilization combined with the sensitivity of the EOS Rs sensors more than makes up for the f/8. You simply can't think in terms of film anymore. Today's f/8 is yesterday's f/4. In terms of economics to get a single stop faster you're going to need to cough up more than four times the cost which I guarantee you will not note the single stop more in speed. There's certainly no gain in image ... MoreCanon's RF 100-400mm f/5.6-8 is perhaps the single greatest buy in the photography world today. They could have easily charged double the price. What you get for $500 is an outstanding optic, capable of producing simply phenomenal images. Read the reviews on line. They are near unanimous in singing the praises for this lens. Is it slow at f/8 at 400mm? Not really. Image stabilization combined with the sensitivity of the EOS Rs sensors more than makes up for the f/8. You simply can't think in terms of film anymore. Today's f/8 is yesterday's f/4. In terms of economics to get a single stop faster you're going to need to cough up more than four times the cost which I guarantee you will not note the single stop more in speed. There's certainly no gain in image resolution. Same goes with the RF line of f/4 L lenses versus their RF equivalents at f/2.8. The additional cost is simply not worth it. You will not regret purchasing the 100-400mm lens. It's magnificent!
I bought this lens because of reviews stating that said the image quality is fantastic, plus it is much smaller in size and lower in weight compared to L glass. I'm going on a landscape photo trip that will involve miles of hiking every day, so size and weight are critically important. I have the EF 100-400 f/4-5.6 L (a wonderful beast), and while the images are amazing, I did not want to carry that thing all day long. For the price, I am simply stunned by the image quality of this RF 100-400. I took it out for some test shots and I believe it is every bit as sharp as my EF 100-400, especially when it comes to edited and printed images. Yes, it is a few stops slower, but for landscape work on a tripod, that does not matter. And I can shield it from rain with a cover ... MoreI bought this lens because of reviews stating that said the image quality is fantastic, plus it is much smaller in size and lower in weight compared to L glass. I'm going on a landscape photo trip that will involve miles of hiking every day, so size and weight are critically important. I have the EF 100-400 f/4-5.6 L (a wonderful beast), and while the images are amazing, I did not want to carry that thing all day long. For the price, I am simply stunned by the image quality of this RF 100-400. I took it out for some test shots and I believe it is every bit as sharp as my EF 100-400, especially when it comes to edited and printed images. Yes, it is a few stops slower, but for landscape work on a tripod, that does not matter. And I can shield it from rain with a cover since it isn't weather-sealed like L glass is. I am very much looking forward to the trip with this lens.
| Mount | RF |
| Focal Length | 100-400mm |
| Minimum Focusing Distance | 0.88 (at 200mm) |
| Maximum Magnification | 0.41x (at 400mm) |
| Lens Construction | 12 elements in 9 groups |