William Optics RedCat 51 Flatfield APO 51/250 mm RedCat 51 Flatfield APO 51/250 mm William Optics telescope

William Optics RedCat 51 Flatfield APO 51/250 mm telescope.

This William Optics RedCat 51 Travel Apochromat apochromatic refractor for astrophotography and nature photography is intended for all astrophotographers and nature photographers who are looking for a transportable and compact telephoto lens of the highest quality.

Due to the 4-element Petzval design, a fully corrected image field of 44 mm diameter is achieved without chromatic aberration. Therefore, even the use of full frame cameras is possible.

Astrophotography: with a focal length of 250 mm and a fast focal ratio of f / 4.9, short exposure times are possible .The maximum working distance of 59.70 mm allows the use of all popular astronomical and digital SLR cameras. Thanks to the2"filter thread that is integrated in the helical focuser, it is also possible to use specific filters for deep sky, broadband .....

In addition, a Bahtinov mask is included as standard. The mask is a great help when focusing and is integrated into the lens cap.

Field photography and animal photography: The RedCat 51 is also perfect for e.g. animal photography. The non-slip helical focuser allows you to focus in seconds. The image quality will impress you.

Observing with eyepieces:of course, you can also observe with the RedCat 51. With the optional 1.25 " adapter, all 1.25" eyepieces can be attached .

Technical specifications:

• Aperture: 51 mm
• Focal length: 250 mm
• Focal ratio: f / 4.9
• Optical Design: Petzval 4-element design with FPL53 lens without false color (4 elements in 3 groups)
• Glass types: FPL53 and FPL51
• Illuminated and corrected image field: 44 mm diameter
• Working distance from M48x0.75 thread: 59.5 mm backfokus
• 2" filter thread
• 360° camera rotation
• Dovetail: Vixen and photographic tripods
• Spray cap diameter: 80 mm
• Tube length: 225 mm
• Tube weight: 1.5 kg
• Nylon case
• Camera support M48
• Bahtinov mask
• Very well corrected image field of 44 mm diameter, even suitable for full frame cameras
• Camera connection via M48 thread (suitable adapters are available)
• 360° camera rotation
• Precise focusing via helical focuser

Telescope William Optics RedCat 51 Flatfield APO 51/250 mm.