Photron 250mm Ritchey-Cretien OTA (6113)
Photron 250mm Ritchey-Cretien OTA (6113)
Photron 250mm Ritchey-Cretien OTA (6113)


Photron 250mm Ritchey-Cretien OTA (6113)

Regular price
$ 3,218.00
Sale price
$ 3,218.00
Unit price

This item is out of stock but you can place an order now and we’ll ship when it becomes available.


The Photron line of iOptron Ritchey-Cretien design telescopes feature low thermal expansion quartz primary and secondary mirrors with ninety-nine percent reflective dielectric coatings. The RC optical design delivers coma, spherical, and chromatic aberration free results that is perfect for color or monochrome imaging. A fixed position primary mirror eliminates image shift that occurs from focusing with other telescope designs. The iOptron RC6 comes with a 2" dual-speed linear-bearing Crayford focuser. Three focuser extension rings are provided for a “flex-free” solid extension as a means to take up any unneeded back focus. Its steel tube is equipped with knife edge baffles to diminish contrast reducing stray light, improving the instrument in both visual and imaging uses. The RC10 model comes with top and bottom dovetail plates adding rigidity to the tube while providing attachment points for the mount and other accessories to be used.


  • Coma free, chromatic aberration-free, spherical aberration-free optics
  • 250mm (10") optical aperture
  • 2000mm focal length
  • f/8 focal ratio
  • Fixed primary
  • Low thermal expansion quartz mirrors
  • Multiple Knife-Edge Baffle System
  • 2" Dual Speed Crayford Focuser
  • Finder scope base and two dovetails bars
  • Optional finder scope, diagonal and 1.25" eyepiece (Not Included)
  • Optional iOptron Electronic Focuser (Not Included)
  • OTA w/2" dual speed Crayford focuser
  • 2X25mm, 1X 50mm focus extention
  • 1.25" accessory adapter
  • Top and bottom Losmandy dovetail bars
Optical Design Ritchey-Chretien
Clear Aperture 250mm
Focal Length 2000mm
Focal Ratio f/8
Resolving Power 0.46 arc seconds
Limiting Magnitude 14.7
Highest Useful Magnification 295X
Secondary Mirror Size 110mm in diameter
Focuser 10:1 Crayford dual-speed
Focuser size 3.3”
Dovetail Bar Losmandy-style
Mounting Bar (Top) Losmandy-style
Finderscope Base Yes
Finder scope Optional
Tube material Steel
Tube Length 28.4”
Tube Weight 35 lbs
OTA Primary Mirror Cooling Fan Yes (three built-in fan, with battery holder)
Other Accessories 2” to 1.25” compression ring adapter; 
1" long extension tube X2 
2" long extension tube X1
Gross Weight 48 lbs
Warranty One year limited

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