![]() The RedCat 51 is constructed to have a big 43mm image circle compatible with APS-C and full-frame DSLRs, mirrorless, and dedicated astronomy cameras. No field flattener will ever be needed with this scope. The RedCat 51 / SpaceCat 51 utilizes FPL53 and FPL51 glass in a 4-element Petzval design for excellent color correction and an exceptionally flat field. It’s ideal for ultra-wide-field imaging of the deep sky and for terrestrial imaging of birds, landscapes, and wildlife.įast, Razor-Sharp Optics and Flat Field with a Large Field of View Includes slot for 48mm astronomy filters and M48 threads to accommodate a wide range of cameras. ![]() Precision helical focuser, field rotator, and Bahtinov mask for fast and precise set-up.Ideal for wide-field astronomical or terrestrial imaging with APS-C or full-frame DSLR, mirrorless, or dedicated astronomy cameras.Ultra-compact 51mm Petzval apochromatic refractor with razor sharp optics and intrinsically flat field.Features a new mounting ring and dovetail rail.Features a focusing index on the lens body.Features a tilt-adjustment mechanism on the rear to ensure that your camera sensor is squared with the optical axis.William Optics designs an impeccable astrograph in the Redcat 51 APO! William Optics RedCat 51 APO f/4.9 Refracting Telescope
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