William RedCat 61 Apo - 61mm f/4.9 flatfield refractor for astrophotography

With the REDCAT61 astrograph, William offers a very well-corrected telescope for astrophotography up to full format.

♦ Aperture 61 mm / focal length 300 mm / focal ratio 1:4.9

♦ Petzval design with pure color apochromatic FPL53 lens

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

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

♦ 360° rotation of the camera for the right image section

♦ Focusing via internal focusing (William Internal Focus Design - WIFD) as with telephoto lenses

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

♦ Flexible prism rail on the base (long version), suitable for Vixen Level and Arca-Swiss, plus a 1/4" photo tripod internal thread

♦ Bahtinov mask for astrophotography is included


 
William Optics REDCAT 61mm f/4.9 Astrograph
The William RecdCat 51 is a successful model and has found its fans. Now William offers a more powerful RedCat with a 61mm opening. The refractor is also designed for mobile astrophotography and is carried by smaller mounts or stable star trackers.

The Apo is aimed at astrophotographers and nature photographers who are looking for a portable and powerful manual telephoto lens. Like many telephoto lenses, the focusing works internally, but like telescopes, it uses buttons with an additional fine focusing button. The Petzval design offers very good correction and illumination for all cameras up to full format.
 
Photography with the RedCat 61 Apo:

♦ Astrophotography
With a 300 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 fine focusing enables precise focusing, the rotation enables the selection of the appropriate image section. Included in delivery is a Bahtinov mask for astrophotography. The mask helps with focusing and is integrated into the lens attachment.

♦ Landscape photography and wildlife photography
The RedCat 61, for example, is also ideal for photographing animals. The internal focusing allows you to focus without shifting your weight, i.e. without changing your position. The image section is therefore retained. The imaging performance will impress you. A photo tripod is necessary for use.


 
Opening: 61mm
Focal length: 300mm
Aperture ratio: f/4.9
Optical design: 4-element Petzval design with element made of FPL53
Illuminated and corrected field of view: 44 mm
Focusing: Internal Focusing (William Internal Focus Design - WIFD)
Dew cap: Integrated
Bahtinovmask: Yes
Mounting connection: Prism rail type Vixen and Arca-Swiss, with tripod thread
Weight: less than 2.8 kg (OTA only), less than 3.7 kg (OTA with pipe clamps, dovetail bar and viewfinder shoe/handle)


♦ RedCat 61 Apo
♦ Bahtinov mask
♦ Cover caps for lens and eyepiece connection
♦ Cover cap for fine drive
♦ Pipe clamps
♦ Universal prism rail with photo tripod connection
♦ Handle