Celestron 11 Rowe-Ackermann Schmidt Astrograph -RASA Telescope - OTA Only
Celestron
The Celestron 11" RASA Telescope is an astrophotography telescope that delivers an incredibly fast f/2.2 for shorter exposure times and improved tracking abilities compared to standard telescopes, specifically catered for long exposures. The RASA refers to Rowe-Ackermann Schmidt Cassegrain telescope that was previously only found in high end premium cameras.
To improve the images from this telescope, the Celestron 11" RASA Astrograph also features rare-earth glass for images with no aberration, field curvature or any other visual flaws. The telescopes also feature custom engineered linear brass focuser bearing that reduces image shift, and its integrated 12V MagLev fan reduces cooldown time while simultaneously blocking dust and air pollutants that interferes with image clarity.
Optical Design
Rowe-Ackermann Schmidt
Aperture
279 mm (11")
Focal Length
620 mm (24.4")
Focal Ratio
2.22
Light Gathering Power (Compared to human eye)
1588x
Resolution (Rayleigh)
0.49 arc seconds
Resolution (Dawes)
0.41 arc seconds
Back focus with included camera adapter
55 mm (2.16")
Back focus from top of threaded collar
72.8 mm (2.86")
Optical Tube
Aluminium
Optical Tube Length
838.2mm
Finderscope
Not included
Optical Tube Weight
19.5kg
Included items
42 mm (1.65") T-thread camera adapter, 48 mm (1.89") camera adapter, fan battery pack
About Celestron
Celestron was founded by Tom Johnson whose first telescope design was a simple 6-inch reflector, built for his young son. He gradually progressed to making larger scopes in more sophisticated designs. Today, the Celestron company is an industry leader in designing and manufacturing optical equipment including telescopes (computerised and non-computerised), binoculars, spotting scopes and its accompanying accessories. Celestron's legacy spans 50 years, and has grown to enjoy recognition from amateurs to serious astronomers globally. The company seeks to remain innovative by growing its product offerings, while supporting science education around the world.
Product Code: CLS-91075
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30 Days Returns Policy
At OpticsCentral, we want you to be happy with your purchase! If you have any problems with your order within 30 days of purchase, we are happy to help you out with an Exchange or Refund.
No problem! If you would like to return an item to us for an Exchange or Refund, we are happy to do so within 30 days of purchase as long as the item is in its original condition with all of the original packaging. Simply contact our Customer Service team via the Contact Us page or call us on 1300 884 763 and we will issue you with a Return Authority for your product.
Please note that return shipping is at the expense of the customer and Refunds will exclude the original shipping fees.
*Unfortunately, we are unable to accept Change of Mind returns on Telescopes unless the packaging has not been opened.
It’s unfortunate, but sometimes products may have a manufacturing fault or get damaged in transit. Sometimes packaging errors can occur - we are human afterall! If you have any issues with your order, please contact our Customer Service team via the Contact Us page or call us on 1300 884 763 within 30 days of receiving your order and we will issue you with a Return Authority for your product.
Once assessed by our team and the item is found faulty or we have made a mistake, we are certainly happy to provide you with an Exchange or Refund.
Return shipping for Faulty or Incorrect products is FREE, and we will send out the replacement at no additional cost to you.
Please allow 4-6 weeks for your item to be returned to us and assessed. Refunds will be made or exchanges finalised during this time.
The Celestron 11" RASA Telescope is an astrophotography telescope that delivers an incredibly fast f/2.2 for shorter exposure times and improved tracking abilities compared to standard telescopes, specifically catered for long exposures. The RASA refers to Rowe-Ackermann Schmidt Cassegrain telescope that was previously only found in high end premium cameras.
To improve the images from this telescope, the Celestron 11" RASA Astrograph also features rare-earth glass for images with no aberration, field curvature or any other visual flaws. The telescopes also feature custom engineered linear brass focuser bearing that reduces image shift, and its integrated 12V MagLev fan reduces cooldown time while simultaneously blocking dust and air pollutants that interferes with image clarity.
Optical Design
Rowe-Ackermann Schmidt
Aperture
279 mm (11")
Focal Length
620 mm (24.4")
Focal Ratio
2.22
Light Gathering Power (Compared to human eye)
1588x
Resolution (Rayleigh)
0.49 arc seconds
Resolution (Dawes)
0.41 arc seconds
Back focus with included camera adapter
55 mm (2.16")
Back focus from top of threaded collar
72.8 mm (2.86")
Optical Tube
Aluminium
Optical Tube Length
838.2mm
Finderscope
Not included
Optical Tube Weight
19.5kg
Included items
42 mm (1.65") T-thread camera adapter, 48 mm (1.89") camera adapter, fan battery pack
About Celestron
Celestron was founded by Tom Johnson whose first telescope design was a simple 6-inch reflector, built for his young son. He gradually progressed to making larger scopes in more sophisticated designs. Today, the Celestron company is an industry leader in designing and manufacturing optical equipment including telescopes (computerised and non-computerised), binoculars, spotting scopes and its accompanying accessories. Celestron's legacy spans 50 years, and has grown to enjoy recognition from amateurs to serious astronomers globally. The company seeks to remain innovative by growing its product offerings, while supporting science education around the world.
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