William Optics Apochromatic refractor AP 51/250 RedCat 51 OTA

William Optics RedCat 51 Travel Apochromat for Astrophotography and Nature Photography

This apochromatic refractor is intended for all astro-photographers and nature photographers who are searching for a transportable and tack-sharp telephoto lens. Due to the 4-element Petzval design, a fully corrected image field of 44 mm diameter without chromatic aberration is achieved. Thus even the deployment of full-frame cameras is possible. However, with 225 mm length, the apo is not larger than a normal telephoto lens. But it can do much more.

The application areas of the RedCat 51 apo:

♦ Astrophotography
With 250 mm focal length and fast f/4.9, short exposure times are possible. The working distance of 55 mm allows using all popular astro cameras and DSLR/SLR cameras. Due to the 2" filter thread which is integrated in the helical focuser, using nebula filters is also possible. Include in the scope of delivery is a Bahtinov mask. The mask helps when focusing and is integrated in the objective cap.

♦ Countryside photography and animal photography
The RedCat 51 is also perfect for, for example photographing animals. The slip-proof helical focuser allows focusing within seconds. The image quality will impress you.

♦ Observation with eyepieces
Of course you can also observe with the RedCat 51. With the optional star diagonal almost all popular 1.25" eyepieces can be attached. The angled view is helpful when observing objects close to the zenith as well as when observing nature at daytime, the design as Amici prism provides a correctly orientated image. You can find this item, as well as a matching eyepiece, in the accessories section.