LotuTec coating: Sheds water, dirt, grease, grime. Lenses can be wiped clean without smearing. T multicoating: lenses are fully multicoated with T coatings to reduce flare, improve contrast, enhance light transmission. FL Concept: fluoride glass lens elements deliver brighter and sharper images with accurate color and higher levels of contrast. They minimize chromatic aberrations while virtually eliminating stray light interference, image fuzziness, low contrast.
Lightweight housing is waterproof and fogproof. Thread for adapting photo/astro adapter: M 45 x 0.5. Integral retractable lens hood shades and protects objective. Focus knob is ergonomically positioned for intuitive operation. Rotating tripod collar with 1/4"-20 and 3/8"-16 mounting threads.
DSF - dual-speed focusing: when a subject is in clear focus, the system sets itself into Precision Mode where a 270° rotation on either side of current focus is slow and precise. Outside of that zone the focusing speed increases 5x. Once a new focus is established, the system automatically drops back to Precision Mode. _gsrx_vers_1516 GS 9.3 (1516).