William Optics RedCat 71 APO f/4.9 Refracting Telescope

123,600.00 excl. 18% GST

  • 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).
Lens Type Petzval Design
Focal Length 350mm
Diameter 71mm
Aperture f/4.9
Flattener Petzval Flat Field
Focuser Helical Focuser with 2GT Gear Ring
Color Red
Lens Material FPL-53
Strehl Ratio 0.95+
Camera Format Full Frame DSLR / Mirrorless / CMOS / CCD
Test Report Not Available
T-Mounts Supported Canon EF, RF Nikon F, Z Sony E Pentax K Micro Four Thirds (M4/3) FUJI X
Tube Length 435mm
OTA Weight 2.8kg
Total Weight 3.7kg
What’s 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


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