William Optics Black & White Cat 51

The William Optics Black & White Cat 51 is the latest iteration of the popular William Optics RedCat 51 series. Available as a limited-edition OTA, the Black and White Cat offers all the latest updates of the 51 series.

William Optics Black & White Cat 51The William Optics Black & White Cat 51 offers a 51mm objective lens in a sleek quadruplet Petzval APO design, using Synthetic Fluoride (FPL53 and FPL51) glass for a full frame flat field image. The optical quality provides exceptional performance at a fast focal ratio of f/4.9 and its compact size makes it ideal for convenient wide field astrophotography or piggybacking.

The Black & White Cat 51 comes with 48 mm threads, so it is compatible with several different brands of digital and mirrorless cameras such as Canon, Nikon, Sony, Pentax, as well as the most popular dedicated astronomy camera manufacturers such as ZWO, QHY and more. It incorporates a smooth helical focuser, a field rotator that is fully rotatable by 360 degrees, a slot for 48mm filters and a reversible dovetail for either Vixen style or Arca-Swiss mounting.

The William Optics Black & White Cat 51 specifications include:

– Optical Design: Refractor

– Refractor Design: Apochromat (APO)

– Focal Length: 250mm

– Diameter: 51mm

– Aperture: f/4.9

– Number of Refractor Elements: 4

– Focuser: Helical focuser

– Image Circle: >43mm

– OTA length (fully retracted): 228mm

– OTA length (fully extended): 291mm

– Weight: 2.9 lbs / 1.3kg (OTA only); 3.9 lbs / 1.76 kg (OTA with ring and dovetail)

You can learn more about the William Optics Black & White Cat 51 here.

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