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William Optics RedCat 71 APO 348mm f/4.9 OTA

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Product Code
Telescope Type
APO Quadruplet Refractor
Aperture (mm)
71 mm
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William Optics

William Optics RedCat 71 APO 348mm f/4.9 OTA

William Optics RedCat 71 APO is a 71-mm f/4.9 refractor using a Petzval design with a doublet front element incorporating FPL-53 glass, plus a single central element and a single rear lens. By this design, William Optics RedCat 71 APO provides a flat image plane without any additional flattener and the image circle is over 45mm. William Optics RedCat 71 APO is designed primarily for imaging, making it an astrograph.

William Optics RedCat 71 APO provides an excellent colour correction and pinpoint stars at the very edge of a 45mm image circle.

If you want to take images with the best quality, this beautiful and powerful telescope is what you want!

Key Features:

  • 71mm f/4.9 Astrograph.
  • FPL-53 glass for colour free apochromatic performance.
  • 4 elements in 3 groups (2-1-1- configuration; new, unique, patented design - not a conventional objective/flattener/reducer design).
  • Covers 45mm full frame imaging circle.
  • Precise helical focusing and camera rotation; includes a 48mm make thread that accepts a wide T-ring.
  •  Includes mounting rings, 21cm long Red Vixen style dovetail and Cat saddle.
  •  Weight =  6.2lbs / 2.8kg (OTA only);  8.2lbs /  3.7kg (OTA with ring, dovetail and saddle).

Four-Element Patented Design 2+1+1, Full frame/ APS-C compatible

William Optics RedCat 71 LensWilliam Optics RedCat 71 Image Circle


Super Bright Bahtinov mask. 

The premium quality of Anodizing finish and calibrated helical focuser with 2GT gear ring which is much more precise than those on typical camera lenses, and it is lockable, making it easy to nail and maintain focus.

(2GT standard gear ring, 153 teeth, Diameter 98mm, width 8mm)

William Optics RedCat 71 Bahtinov MaskWilliam Optics RedCat 71 Focuser

What's in the Box?

William Optics RedCat 71 in the Box

  • [A] M48 Dust Cap/Thread
  • [B] Tilt Adapter
  • [C] Camera Angle Rotator
  • [D] Rotator Tension Knob
  • [E] Saddle Handlebar (with two M4 thumb screws)
  • [F] Helical Focuser with 2GT Gear Ring
  • [G] Arca Swiss/Vixen Plate
  • [H] Mounting Rings
  • [I] Due Shield with Focus Tension Ring
  • [J] Super Bright Bahtinov Mask
  • [K] Soft Carry Bag


  • Focal Length    348mm
  • Diameter    71mm
  • Aperture    f/4.9
  • Focuser    Helical Focuser with 2GT Gear Ring
  • Image Circle    >43mm
  • Tube Length
  • (with dew shield)    435mm
  • Weight    6.2lbs / 2.8kg (OTA only)
  • 8.2lbs / 3.7kg (OTA with ring, dovetail and saddle)

William Optics RedCat 71 Spot Diagram

William Optics RedCat 71 Longitudinal Aberation


Specifications: William Optics RedCat 71 APO 348mm f/4.9 OTA

  • Focal Length - 348mm
  • Diameter - 1mm
  • Aperture - f/4.9
  • Focuser - Helical Focuser with 2GT Gear Ring
  • Image Circle - >43mm
  • Tube Length
  • (with dew shield) - 435mm
  • Weight - 6.2lbs / 2.8kg (OTA only)
  • 8.2lbs / 3.7kg (OTA with ring, dovetail and saddle)

What's in the Box

What's in the Box: William Optics RedCat 71 APO 348mm f/4.9 OTA

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