Astronomy Specialist

REDCAT 51 F/4.9 APO REFRACTOR

$1,499.00

Quantity
- +

 

Click here to check out Alan Dyer's review of the RedCat 51 from Sky & Telescope magazine!

 

The William Optics RedCat 51 is a fast apochromatic petzval refractor optimized for widefield astrophotography. Affordable, small and lightweight, the RedCat is perfect for traveling and on-the-go imaging.

With a fast focal ratio of f/4.9 and a focal length of 250mm, the RedCat 51 is perfect for capturing large deep space objects such as the Rosette nebula, the Pleiades, Eta Carina and more. The RedCat also excels as a telephoto wildlife lens.

The unique optical design includes the highest quality FPL-53 and FPL-51 synthetic fluorite glass for the best possible colour correction and a flat field across a full-frame sensor.

 

Features

  • Interchangeable camera mount
  • Full-frame / APS-C compatible
  • Apochromatic FPL-53 & FPL-51 lenses
  • Anti-reflection multicoating
  • Super bright Bahtinov mask
  • Dual Vixen / Arca-Swiss mounting plate
  • Field rotator with markings for easy framing
  • Premium indexed helical focuser
  • Small and easy to store
  • 48mm filter slot for standard 2" filters
  • Modular mounting options
  • Invertable sun shade / dew shield


 

Optical design

Apochromatic petzval (4 elements in 3 groups)

Objective diameter

51 mm

Focal length

250 mm

Focal ratio

f/4.9

Image circle

44 mm

Material

Anodized aluminium alloy

Mount attachment

 210 mm Dual Vixen-style / Arca-Swiss dovetail bar

Focuser

Indexed manual helical focuser

Camera connection

M56 x 0.75, M48 x 0.75, optional T-Mounts

Backfocus

77.7 mm

Tube weight

1.8 kg

Tube length

225 mm (fully retracted), 305 mm (fully extended)

Tube diameter

80 mm

SKU

WO-L-RC51Ix

 

 

  • RedCat 51
  • Patented Bahtinov mask
  • 210mm dual dovetail
  • Mounting rings
  • Soft carry case

 

 

Eta Carina with RedCat 51, Nikon D800 by Wang Wei Hao.

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