William Optics RedCat 71 Apo - 71 mm f/4.9 Flatfield Refractor for Astrophotography

William offers with the REDCAT71 Astrograph a very well corrected telescope for astrophotography up to full frame format.

♦ Aperture 71 mm / Focal length 350 mm / Focal ratio f/4.9

♦ Petzval design with chromatic aberration free FPL53 objective (4 elements in 3 groups)

♦ Very well corrected and illuminated image field up to full frame format - the corrector is built in - no more adapter battle necessary

♦ Camera connection via M48 male thread (suitable adapters are available) - working distance 55 mm

♦ 360° rotation of the camera for the right display window

♦ Focusing via precise helical focuser like telephoto lenses

♦ Tilting option for individual adjustment of the camera sensor to the telescope

♦ Flexible dovetail bar at the base (long version), suitable for Vixen style and Arca-Swiss saddle plates, in addition with 1/4" female photo tripod thread

♦ Nylon carrying bag and Bahtinov mask for astrophotography are included in delivery


 

William Optics REDCAT 71 mm f/4.9 Astrograph

The William RecdCat 51 is a successful model and has found its following. Now William offers the much more powerful RedCat with 71 mm aperture. The refractor is again designed for mobile astrophotography and is carried by smaller mounts or by stable startrackers.

The apo is aimed at astrophotographers and nature photographers who are looking for a portable and powerful manual telephoto lens. The focusing is like with a telephoto lens via a knurled ring. The Pezval design offers a very good correction and illumination for all cameras up to full frame format.
 

The areas of application of the RedCat 71 apo:

♦ Astrophotography
With 348 mm focal length and fast f/4.9, short exposure times are possible. The working distance of 55 mm allows the use of all common astro cameras, system cameras and DSLR/SLR cameras. The use of nebula filters is also possible due to the 2" filter thread integrated in the helical focuser. Included is a Bahtinov mask for astrophotography. The mask helps with focusing and is integrated in the objective cap.

♦ Countryside photography and animal photography
The RedCat 71 is also perfect for, for example photographing animals. The slip-proof helical focuser allows focusing within seconds. The image quality will impress you. A photo tripod is necessary for use.

♦ Observation with eyepieces
Of course you can also observe with the RedCat 71. With the optionalen 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.

 

Aperture:	71 mm
Focal length:	350 mm
Focal ratio:	f/4.9
Optical design:	4-element Petzval design with FPL53 element
Illuminated and corrected field of view:	44 mm
Dew shield:	Integrated
Bahtinov mask:	Yes
Mount connection:	21 cm long Vixen and Arca-Swiss style dovetail bar with photo thread
Weight:	6.2 lbs / 2.8 kg (OTA only), 8.2 lbs / 3.7 kg (OTA with ring, dovetail and saddle)

In the box:
♦ RedCat 71 apo
♦ M48 camera connector
♦ Bahtinov mask
♦ Dust caps for objective and eyepiece
♦ Tube rings
♦ Universal dovetail bar with photo tripod connection
♦ Nylon carrying bag with foam inside