William Optics

RedCat 51mm f/4.9 V.2


  • Sale
  • Regular price $843.00

See It In Person - On Display In Our Showroom!

Free Ground Shipping Available (CONUS Only)

Yes, our inventory is accurate!
We do not offer products for purchase unless they are in stock.


NEW Version 2 RedCat with upgraded focus tensioner on the dew shield.

Probably the very sharpest 250mm camera lens you will find!

  • Newest version (including camera angle adjuster, cat paw scope clamp, DSD dovetail bar, and focus tensioner)
  • 51mm quadruplet ED APO f/4.9 (250mm fl)
  • FPL53 & FPL51 glass 
  • 3.2 lbs tube weight.
  • >43mm imaging circle with a flat field edge to edge for full-frame sensors
  • Dual Vixen and Arca Swiss Dovetail
  • M48 thread to accept wide t-rings/t-mounts

 

The best value, highest quality 250mm lens you will find for your camera.

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. 

Filter Adapter allows use of 48mm filters. Focusing is made easy with a bahtinov mask integrated into the lens cap. 

 

Aperture 51 mm (2")
Camera/Eyepiece Connection Male M48x0.75
Dawes Limit 0.46 arcseconds
Focal Length 250 mm
Focal Ratio f/4.9
Glass Type FPL-53 and FPL-51
Highest Useful Magnification 102x
Light Gathering Power 53x
Limiting Magnitude 12.3
Optical Design Petzval
Tube Color Red
Tube Diameter 51mm
Tube Weight 3.2 lbs
Dew Shield Outer Diameter (for soar filter sizing) 80.5mm

 

  • RedCat 51mm Telescope
  • Bahtinov Mask Cap
  • 210mm Dovetail
  • Upgraded Mount Ring (with cat paw logo)
  • Soft Carry Case

 

SKU: L-RC51II
Barcode: