william optics redcat 91 wifd 91mm f 4 9 apochromatic refractor telescope ota only Third Party Suitable for a variety of

Suitable for a variety of environments

The switching technology optimizes energy efficiency

Brand: Astec

critical for applications requiring high input/output operations per second (IOPS

william optics redcat 91 wifd 91mm f 4 9 apochromatic refractor telescope ota only Third Party Suitable for a variety ofFeaturing an image circle big enough for medium format photography, the RedCat 91 WIFD 91mm f 4. 9 Apochromatic Refractor Telescope from William Optics is a photo only optical tube assembly built for making gorgeous deep sky images. The RedCat 91 features a fully multicoated five element lens with super ED, ED, and Lanthanum elements in a field flattening Petzval design that delivers edge to edge sharpness and eliminates complex back focus