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

Its robust construction and IP54 protection rating ensure durability and resistance against dust and water ingress

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

Brand: Astec

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