Leica engineered the 35mm Digiscoping Objective Lens to address two key drawbacks to their original digiscoping adapter: to improve the transition between observation and taking photos, and to take advantage of the wide zoom magnification range afforded by the eyepiece. Where the old adapter replaced the eyepiece, therefore effectively making the APO-Televid into a fixed-focal-length telephoto lens, this new objective lens mounts over the eyepiece so users can quickly remove it to make observations and easily re-install it to capture photos. This mounting also allows users to zoom in on subjects using the eyepiece, therefore, maintaining the spotter's versatility even while digiscoping.
The adapter is machined to fit Leica's 25-50x 82mm & 65mm APO-Televid spotting scopes and has been optimized for use with 20-APS-C cameras, where it will remain vignette-free through the entire zoom range. While the adapter is compatible with full-frame sensors, images may experience vignetting at certain magnifications. To minimize light-loss and ensure true colour fidelity and high-contrast, Leica utilizes extra-low-dispersion (ED) glass elements and fully multi-coats them with proprietary anti-reflection coatings. Because of design differences in the mounting system, this accessory will not fit older 77mm Leica Televid spotters.