The Nikon FSA-L2 Camera Attachment is for use exclusively with Nikon EDG Fieldscopes & Nikon DSLR cameras. When used with the Nikon EDG 85/A Fieldscopes, the FSA-L2 Camera Attachment has a 3.5x zoom & provides a focal length of 500-1750mm (f/5.9-21). When connected to an EDG scope via the FSA-L2 Camera Attachment, Nikon DSLRs can be used in aperture priority mode for fast & accurate exposure. The FSA-L2 features a bright optical path with fully multilayer-coated lenses, meaning that the combination of EDG Fieldscopes, the FSA-L2 & Nikon DSLR cameras allows the capture of beautiful moments with high precision & superb image quality.