Parallax Instruments 10" Classical F/15 Cassegrain OTA Telescope $5,900.00,  Parallax Instruments PI250C,Optical Tubes (OTA) Telescopes, On Sale
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Parallax Instruments Classical Cassegrain OTA-10" Telescope f/15 w/7x50 finder, tube rings, Conical mirror, PI250C

Item No. 608-11000
Manuf. No. Parallax Instruments PI250C

Special Order Item Please read terms page before placing order

A 50% deposit is required for ordering this product.

Parallax Instruments 10" Classical F/15 Cassegrain OTA Telescope, PI250C

Parallax also offers Classical Cassegrain and Dall-Kirkham Cassegrain telescopes in 10", 12.5", 14.5", and 16" apertures. The Classical Cassegrain offers a very long focal length in a relatively compact tube. Includes 2" Feather Touch or 2.7" AP Focuser (Specify), 8X50 finder, standard tube rings, tube weight counterbar assembly and slewing handles.

All optical tubes are finished in high gloss acrylic urethane paint and are furnished with metal snap-lock dust cover and 2" and 1 1/4" focuser adapters. Diagonals or eyepieces are not included. Interferometric test report and fringe analysis data is included with each telescope.

They are excellent instruments for high magnification planetary and double star work. The Dall-Kirkham Cassegrain with its F/20 focal ratio and smaller central obstruction is perhaps the ultimate high magnification visual planetary telescope.


  • Model: PI250C, 10"
  • Clear Aperture: 254mm
  • Focal Ratio: F/15
  • Focal Length: 3810mm
  • Primary & Secondary Mirror: PYREX - LIGHTWEIGHT CONICAL PRIMARY By R. F. Royce Optical
  • Telescope Tube: ALUMINUM
  • Primary Focal Ratio: F/4
  • Secondary Amplification: 3.75X
  • Spacing (Approx.): 29.6"
  • Mirror Coatings: AlSiO
  • Optical Tube Dia.: 12"
  • Optical Tube Length: 40"
  • Optical Tube Weight: 40 lbs.
  • Focuser: 2" Feather Touch or 2.7" AP (Specify)
  • Finderscope: 7X50 (11 X 80 Optional)
  • Tube Rings: Standard
  • Recommended Mount: HD150C
  • Slewing Handles(2): Standard
  • Tube C'wt. Bar Assy.: Standard

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