You can connect a camera with a 52mm threaded lens directly to a ZEISS Conquest Gavia spotting scope using the Photo Lens Adapter. The adapter attaches a mirrorless or similarly lightweight camera to the scope's eyepiece. This allows you to put the Conquest Gavia's high-quality optics to work as a telephoto lens. To avoid vignetting, a focal length of 30mm for cameras with APS-C sensors and 40mm for full-frame cameras is recommended.