Brand: William Optics

William Optics RedCat 51 II APO Petzval OTA (L-RC51II)

L-RC51II

Brand: William Optics

William Optics RedCat 51 II APO Petzval OTA (L-RC51II)

L-RC51II

The wildly popular 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.
  • Optical Design - 51 mm lens, in a sleek Petzval design, using Synthetic Fluoride (FPL53 and FPL51) glass for a full-frame flat field image. The optical quality provides exceptional performance at a fast focal ratio of f/4.9. The Limited Edition RedCat 51 Upgrade will out resolve most high-resolution DSLR lenses of similar focal lengths.
  • Field Rotator - Inspired by luxury watches, the telescope's field rotator is laser etched with a degree indicator. To ensure that you will have the most precise framing possible in a small portable system, the camera can be rotated to fit within a degree of accuracy.
  • Filter Adapter - It is now easier to connect your filter to the Filter Adapter.
  • Filter Index - The filter index marks let you know the estimated focusing site when you twist the focuser.
  • Camera Sensor Tilt Adjuster - The Tilt Adjuster can adjust the tilt of the image plane.
  • Modular Mounting Ring - The single-tube Cat ring is sturdy enough to hold the optical tube and a large-sized DSLR without noticeable flexure. It is modular in the sense that you can add a finder scope or guide camera.
  • All New Mounting Plate - William Optics has reinvented the V-style dovetail. Not only will it fit into a Vixen style saddle plate, but if it's flipped over it can be attached to any Arca-Swiss style photography tripod head. This allows you to use the telescope for both day and night photography. The length of the new mounting plate is 210 mm.
  • Reversible Dew Shield - To maximize portability, the dew shield on this telescope is reversible. When stored backwards it can shorten the telescope length by approximately 83 mm.
  • Bahtinov Cap - The cap with this telescope not only protects the glass from the elements, but it also has one of the most useful tools when it comes to focusing. The Bahtinov Cap creates three lines that pass through a bright star. There is a main large line and a smaller cross-section of two lines making an “X”. The goal is to get the large line centered between the X and centered on the star. Once that is done, you have a perfect focus in as little as 2 to 3 seconds.
$850.00 USD

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Why we love the William Optics RedCat 51 II APO Petzval OTA (L-RC51II)

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

Designed to be the best, affordable, small, lightweight and fast Apochromatic refactor for astrophotography. The unique optical design includes the highest quality glass for the best possible color correction and flat large image circle. The result is a 51 mm objective lens, in a sleek Petzval design, for a full-frame image.

What can I see with a William Optics RedCat 51 II APO Petzval OTA (L-RC51II)?

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 - 10x Magnification

(Sold Separately)

Jupiter with

10mm Eyepiece - 25x Magnification

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Jupiter with

5mm Eyepiece - 50x Magnification

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Moon with 25mm Eyepiece

10x Magnification

(Sold Separately)

Moon with 10mm Eyepiece

25x Magnification

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Moon with 5mm Eyepiece

50x Magnification

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Andromeda with 36mm Eyepiece

7x Magnification

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Andromeda with 25mm Eyepiece

10x Magnification

(Sold Separately)

Andromeda with 10mm Eyepiece

25x Magnification

Sold Separately

What's in the Box

  • RedCat 51 51mm f/4.9 FPL53 APO Refractor Telescope OTA
  • M48 Camera Mount
  • Bahtinov Mask Cover
  • Soft Carry Case

Specifications

Focal Length: 250mm
Diameter: 51mm
Aperture: f/4.9
Camera Format: APC-C
Full Frame
Focuser: Manual Helical Focuser
Image Circle: > Full Frame
Tube Length: 225mm (Fully Retracted)
305mm (Fully Extended)
Tube Weight: 1.8 kg
Interchangeable T-Mount: Canon EF
Nikon F
Sony E
Pentax
Micro Four Thirds
Fuji

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