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William Optics WhiteCat 51 f/4.9 Petzval Refracting Telescope

ITEM #
WO-L-RC51W
  • Unparalleled optical quality in its class.
  • Flat field from edge to edge.
  • Bahtinov Mask built into the cap!
  • Extremely lightweight and portable.

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  • Regular price $698.00

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William Optics WhiteCat 51 f/4.9 Petzval Refracting Telescope

William Optics WhiteCat 51

From the beginning, the goal was to create the best possible design for an 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 results is a 51mm objective lens, in a sleek Petzval design, for a full-frame image.

OPTICAL DESIGN

William Optics WhiteCat Lens

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 RedCat 51 will out resolve most high-resolution DSLR lenses of similar focal lengths.

FIELD ROTATOR

William Optics WhiteCat Back Rotator

Inspired by luxury watches, the telescope's filed 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 within a degree of accuracy.

MODULAR TUBE RING

William Optics WhiteCat Modular Tube Ring

The single tube 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.

REVERSIBLE DEW SHIELD

William Optics WhiteCat Shield

To maximize portability, the dew shield on this telescope is reversible. When stored backyards it can shorten the telescope length by approximately 83mm.

BAHTINOV CAP

William Optics WhiteCat Bahtinov Promo

The cap with this telescope not only protects the glass from the elements, but it also has one of these 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 perfect focus in as little as 2-3 seconds.

SPECIFICATIONS

Aperture51 mm (2")
Camera/Eyepiece ConnectionMale 2" Filter/Wide T—Ring (M48x0.75)
Corrected Image Circle43mm
Dawes Limit2.27 arcseconds
Focal Length250 mm
Focal Ratiof/4.9
Free ShippingYes
Glass TypeFPL53
Hightest Magnification102x
Light Gathering Power53x
Limiting Magnitude12.3
Optical DesignPetzval
Tube Diameter80mm
Tube Length225mm
Tube Weight3.2 lbs

INCLUDED ITEMS

  • Soft carry case
  • WhiteCat 51 f/4.9
  • M48 Camera Mount
  • Patented Bahtinov Mask