The ES-2 is a Film Digitizing Adapter that lets you easily convert your film images to digital. Taking advantage of the high-pixel count of the D850's 45.7 MP, the Film Digitizing Adapter lets you convert both 35mm slides and negatives to digital files. Using a lens such as the AF-S Micro NIKKOR 60mm f/2.8G ED attached to the D850, the camera's digitizing function automatically reverses the colors and stores them as JPEG images. This once time-consuming process involving a film scanner can be done much more quickly. For negative strips, use the FH-4 Strip Film Holder with the ES-2 and for slides, use the FH-5 Slide Mount Holder with the ES-2. Easing the process for making digital files from your film originals, the ES-2 Film Digitizing Adapter Set from Nikon is a clever accessory for re-photographing 35mm negatives and slides. Designed to be paired with a macro lens, such as the AF-S Micro NIKKOR 60mm f/2.8G ED, this adapter is fitted to the front of the lens and holds the film at the minimum focusing distance of the lens to ensure critical sharpness. Dedicated film holders for both film strips and mounted slides are included, as well, to help hold the film taut and to benefit handling. While suitable for use with any camera, this adapter is particularly well-suited for the D850 due to its dedicated Negative Digitizer mode and ability to automatically reverse colors in-camera to expedite the digitizing process.