William Optics RedCat 71 APO Telescope - Red

Brand: William Optics


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  • 71mm f/4.9 Astrograph
  • 350mm Focal Length
  • FPL-53 glass for color-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)

Product Details

  • Building on the massive success of the RedCat 51, William Optics has proudly announced the all-new RedCat 71!

    The William Optics RedCat71 is a 71-mm f/4.9 refractor that features a 350mm focal length for fantastic widefield images of the night sky. The optical design is a Petzval design with a doublet front element incorporating FPL-53 glass, plus a single central element and a single rear lens. By using this four-element Petzval design, our WO RedCat71 provides a flat image plane without requiring any additional flattener and the image circle is over 45mm.

    45mm Image Circle

    WO RedCat71 is designed primarily for imaging, making it an astrograph. This scope provides an excellent color 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.

    Four-Element Patented Design 2+1+1

    Super Bright Bahtinov Mask

    Full Frame & APS-C Compatible

    Premium Anodizing Finish

    The premium quality of Anodizing finish and calibrated helical focuser with a 2GT gear ring 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)

  • specifications

    Aperture71mm (2.75")
    Corrected Image Circle45mm
    Dawes Limit1.63 arcseconds
    Focal Length350 mm
    Focal Ratiof/4.9
    Free ShippingYes
    Highest Magnification142x
    Light Gathering Power103x
    Optical DesignPetzval
    Tube Length435mm
    Tube Weight6.2 lb
  • included items

    • [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] Dew Shield with Focus Tension Ring
    • [J] Super Bright Bahtinov Mask
    • Soft Carry Case

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