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Orion Telescopes
Advanced
Orion 254mm f/4.7 Reflector Telescope Optical Tube Assembly
£ 507.99
 
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In Stock
  • 254mm (10") aperture and 1200mm focal length reflector telescope optical tube provides vivid, close views of deep-sky and solar system objects
  • Includes 2" Crayford focuser for smooth, backlash-free focus adjustment
  • Recommended for visual or astrophotographic use
  • Weighs 27.2 pounds
  • Optical tube only, does not include tube rings, mount, or tripod - which can be purchased separately


Learn more
Item #  09959u

Responding to your requests, we are pleased to offer the Orioin 254mm f/4.7 Reflector Telescope Optical Tube assembly (OTA) for folks who already have an equatorial mount. This optical tube assembly includes parabolic mirror optics, upgraded 2" Crayford-style focuser, telescope eyepiece holder, quick-collimation cap, dust cap, and dovetail base for finder scope. Aperture: 254mm (10.0"). Focal length: 1200mm (f/4.7). Has a 2" Crayford-style focuser with 2" and 1.25" telescope eyepiece holders. Recommended for visual use or astrophotography. Includes prime-focus camera adapter. Weighs 27.2 lbs. Tube rings, tube ring mounting plate, finder scope, and eyepieces sold separately.

Warranty

Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only. For complete warranty details contact us at sales-eu@telescope.com

Product Support
Visit our product support section for instruction manuals and more
  • Best for viewing
    Fainter deep sky
  • Best for imaging
    Deep sky
  • User level
    Advanced
  • Optical design
    Reflector
  • Optical diameter
    254mm
  • Focal length
    1200mm
  • Focal ratio
    f/4.7
  • Optics type
    Parabolic
  • Glass material
    BK-7
  • Eyepieces
    None
  • Resolving power
    0.46arc*sec
  • Lowest useful magnification
    34x
  • Highest useful magnification
    300x
  • Highest theoretical magnification
    508x
  • Limiting stellar magnitude
    14.7
  • Optical quality
    Diffraction limited
  • Focuser
    2" Crayford
  • Secondary mirror obstruction
    63mm
  • Secondary mirror obstruction by diameter
    25%
  • Secondary mirror obstruction by area
    6%
  • Mirror coatings/over-coatings
    Aluminum & Silicon Dioxide
  • Mount type
    Optical Tube without Mount
  • Astro-imaging capability
    Lunar, planetary & long exposure
  • Tube material
    Steel
  • Length of optical tube
    119.9cm
  • Weight, optical tube
    12.3kg
  • Weight, fully assembled
    12.3kg
  • Additional included accessories
    Collimation cap
  • Other features
    2" crayford focuser w/ 1.25" adapter
  • Warranty
    One year

Orders received by 5pm UTC for in-stock items ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.

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