Description
Optically fast refractor telescopes used for astrophotography are often plagued by significant field curvature, which is especially noticeable when using CCD/CMOS imagers and DSLRs with APS-C sized and full-frame sensors. This manifests in stars that are out of focus on the periphery of the image frame. With the Svbony SV193 field flattener, stars will appear in sharp focus across the entire frame. Lets you enjoy the full imaging potential of your fast refractor telescope. Compatibility One side is a standard 2-inch socket to connect to the main lens;the other side is M48x0.75 threaded to connect to the camera bayonet Fit for refractors with focal lengths of 400mm to 660mm and focal ratios of f/5 to f/7.5, the Field Flattener for Short Refractors Superior Clear Image 3 elements 2 groups lens structure corrected the dispersion of glass and reduce the chromatic aberration Fully multi-layer coating enhance the transmission of lights Blackened lens edges minimize the reflection of lights Specification: Model: SV193 Backfocus:55mm Barrel Size: 2-inch Threads Standard: M48x0.75 Lens Structure: 3-Elements/2Groups Lens Coating: FMC Blackened Lens Edges: Yes Net Weight: 177g Package Includes: 1x Svbony SV193 0.8x Photo Reducer 1x 2PCS Rubber Dust Cover