F6.3 Focal Reducer Schmidt Threads for schmit-cassegrain SCT Telescope

Skyoptikst F6.3focal reducer/corrector is suitable for Celestron 5 "6" 8 "9" 11 "and 14" Schmidt Cassegrain SCT telescope, zenith mirror at SCT port, etc., metal structure, two groups of four-piece design, full-band multi-layer coating, which can reduce the focus of your telescope to F6.3 without changing the image quality. This zoom lens/corrector can make the focal ratio of C5, C6, C8, C9.25 become f6.3; The focal ratio of C14 becomes f7. The use of this zoom lens can increase the field of view and reduce the exposure time in astronomical photography. Skyoptikst does not provide the Schmidt Cassegrain telescope of F6.3 because such a design is impossible, and there will be a large central occlusion, which will lead to the reduction of contrast. The defocus lens/corrector of this f6.3 is a 4-piece design with full surface coating. The use of this zoom lens has a good performance in photography.Name: F6.3 zoom lensShell material: metal structureName: F6.3 zoom lensShell material: metal structureCoating: full broadband coatingSize: 49X34X55MMLens design structure: 2 groups of 4 piecesThreaded interface: ScT interfaceWeight: net weight 0.1KG/gross weight 0.22KGLens material: glass material

• This focal reducer/corrector lens works with all Celestron 5", 6", 8", 9 1/4", 11" and 14" Schmidt-Cassegrain telescopes.
• Four-elements design, fully multi-coated optics,increase the transmittance of light
• It can reduce the focus of your telescope to F6.3 without changing the image quality
• Converts f/10 optical system to faster f/6.3 which can increase the field of view and reduce the exposure time in astronomical photography
• Aluminum alloy frame and all optical glass lens material