Brand: William Optics

William Optics RedCat 71 WFID APO Petzval OTA (L-RC71RDIII)

T-C-71RDII

Brand: William Optics

William Optics RedCat 71 WFID APO Petzval OTA (L-RC71RDIII)

T-C-71RDII

  • 350mm focal length, f/4.9 Petzval apochromatic astrograph
  • Upgraded WIFD focuser
  • 45mm full frame imaging circle
  • FPL-53 glass for colour free apochromatic performance
  • M48, M54, and M68 male threads for attachment to cameras and accessories
    Seamless integration with ZWO EAF
  • Includes William Optics Slide-Base Uniguide 32mm Scope
$1,778.00 USD

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Why we love the William Optics RedCat 71 WFID APO Petzval OTA (L-RC71RDIII)

The wildly popular William Optics RedCat has earned it's place as a legendary astrograph. These use premium glass to deliver accurate color, a flat image, and a wide field. They're great little scopes, perfect for imaging massive nebulae like the flame and horsehead in Orion's belt.

Petzval's are the original fast, wide lenses. They were mathematically designed optics that were way ahead of their time when first developed in the 1840's (that's not a typo) and they are still relevant today. They're known for being flat to the edges, so you won't get any bloated or stretched stars in the corners of your images. They're also super-wide, so you can use a massive camera sensor and take in vast swaths of the night sky.

The RedCat is an advanced astrograph that takes advantage of premium modern glass, and cutting-edge camera technologies to take your astrophotography to the next level.

Product Description

RedCat 71 Optical Design

The William Optics RedCat 71 is the bigger brother to the highly-regarded RedCat 51, which has been raved about by astrophotographers since its release. Building on the RedCat 51's success, the RedCat 71 keeps the same f/4.9 focal ratio and Petzval optical design. This optical design uses four lens elements instead of the three found in triplet refractors. By incorporating this extra element, the RedCat 71 is able to achieve a flat field without the need for an additional field flattener.

RedCat 71 Image Circle & Camera Compatibility

The flat field image circle on the WO RedCat 71 is over 45mm in diameter, meaning it can provide round stars to the corners on a full frame camera, not something many telescopes can claim in this price range. The RedCat 71 telescope comes with a 48mm thread on the back, meaning you can easily attach any dedicated astronomy camera with a standard M48x0.75 connection such as ZWO. For DSLR and mirrorless users, simply add an M48 t-ring for your camera type and you'll be ready to do astrophotography right out of the box.

Game-Changing WIFD Focuser

New in the third generation of the RedCat 71, this telescope features William Optics' new patented WIFD focuser. This game-changing design allows the telescope to focus by moving lens elements internally instead of externally. This has numerous benefits, including reducing vignetting, focuser sag, and most importantly, sensor tilt. The WIFD focuser is also compatible with the ZWO EAF out of the box, unlike previous versions of the RedCat 71.

Includes William Optics Slide-Base UniGuide 32mm Scope

The 32 mm UniGuide guide scope from William Optics has a focal length of 120 mm and a focal ratio of f/3.75. The guide scope comes with a Vixen-style slide-base. This base is compatible with the William Optics saddle carry handle and the Cat Handle bar (neither handles are included).

The back of the William Optics 32mm UniGuide scope comes with an M42 thread for attaching 1.25" cylindrical-type guide cameras such as QHY, SBIG, and ZWO cameras. Tightening knobs will ensure a stable fit for the attached guiding equipment.

  • Aperture: 32mm
  • Focal length: 120mm
  • Focal ratio: f/3.75
  • Length: 265mm
  • Weight: 240g
  • Available Back Focus: 20.1mm

What can I see with a William Optics RedCat 71 WFID APO Petzval OTA (L-RC71RDIII)?

Here are some simulated views of common objects. Results with your telescope will vary with viewing conditions, obrits, equipment and more.

Jupiter with

25mm Eyepiece - 14x Magnification

(Sold Separately)

Jupiter with

10mm Eyepiece - 35x Magnification

Sold Separately

Jupiter with

5mm Eyepiece - 70x Magnification

Sold Separately

Moon with 25mm Eyepiece

14x Magnification

(Sold Separately)

Moon with 10mm Eyepiece

35x Magnification

Sold Separately

Moon with 5mm Eyepiece

70x Magnification

Sold Separately

Andromeda with 36mm Eyepiece

10x Magnification

Sold Separately

Andromeda with 25mm Eyepiece

14x Magnification

(Sold Separately)

Andromeda with 10mm Eyepiece

35x Magnification

Sold Separately

What's in the Box

  • William Optics 71mm Gen 3 RedCat
  • William Optics Slide-Base UniGuide 32mm Scope
  • Dust Cover with Bahtinov Mask
  • 210 mm Vixen Dovetail
  • Mounting Ring
  • Soft Carrying Case
  • Dew Shield
  • Tilt Adjuster
  • Camera Angle Rotation Device
  • Saddle Handle Bar

Specifications

Focal Length: 350mm
Diameter: 71mm
Aperture: f/4.9
Focuser: WIFD (WilliamOptics Internal Focus Design)
Image Circle: 45mm Full Frame
Tube Length: 427mm
Tube Weight:

7.1 lbs (3.2 kg)
9.5 lbs with tube rings dovetail and saddle

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