Shopping cart
is empty

Home > Astronomy > Telescopes > Celestron > RASA > Celestron Telescope Astrograph S 356/790 RASA 3600 OTA

Celestron Telescope Astrograph S 356/790 RASA 3600 OTA

Product no.: 64627
Manufacturer: Celestron

$ 20,300.00

incl. VAT
plus shipping costs

Express shipment possible for delivery tomorrow, 04.12.2021!

too expensive?

ready for shipping in 24 h

+ lead time

Delivery possible before Christmas (European destinations) - when you order by noon on 17.12.!
Right of return up to January 31 2022!


Celestron Telescope Astrograph S 356/790 RASA 3600 OTA
Celestron Telescope Astrograph S 356/790 RASA 3600 OTA
Celestron Telescope Astrograph S 356/790 RASA 3600 OTA
Celestron Telescope Astrograph S 356/790 RASA 3600 OTA
Product description
Customer reviews
Recommended accessories

Product description:

Digital Schmidt camera for wide angle astrophotography!

This astrograph makes it very easy to create stunning photos with a modern DSLR or astronomical CCD camera. The new optical design has a four-lens corrector, incorporating rare earth glass, which suppresses chromatic aberrations and other problems such as coma and field curvature. Never before has an astrograph in this price range delivered such optical quality and spot size over the entire image field. The design also allows for a very low vignetting.

  • super-fast 11" f2.2 optics - sharply images APS format and is even optimized for sensor sizes up to a 70mm field diagonal.
  • extremely short exposure times - the RASA Astrograph acquires images twenty times faster than at f10! Thirty seconds at f2.2 correspond to ten minutes at f10 - tracking control is hence superfluous!
  • huge field of view - with a 620mm focal length, makes wide-angle shots a piece of cake and you and always have an overview
  • excellent focusing mechanism - new bronze bearings reduce image shift, the 10:1 FeatherTouch micro-focuser allows highly precise focusing!
  • innovative Features - quieter 12V MagLev fan reduces the cooling phase, keeps out dust and allows optimum air circulation in the OTA. Various adapters for popular camera brands are included. Back focus for the camera supplied adapters: 55mm, back focus for the front lens group: 69.26mm

RASA stands for Rowe-Ackermann-Schmidt Astrograph - Dave Rowe and Mark Ackermann are renowned optical instrument designers. Together, they hold numerous patents on their inventions. The RASA astrograph combines their expertise and experience.

The Astrograph RASA 36 features the following:

  • A corrected image circle of 60 millimetres for needle-sharp stars right to the farthest corners of the largest sensors available. The usable image circle is as large as 70 millimetres.
  • The four-element lens group uses extra-low dispersion (ED) glass for imaging without chromatic aberration, coma and field curvature (spot size: < 6.3 μm RMS across FOV). The usable spectral range is between 400 and 900 nanometres, so that the sensitivity of the sensors can also be used in the near infrared up to 900 nanometres.
  • The newly designed Ultra-Stable Focus System (USFS) minimises focus drift or other unwanted movements of the primary mirror and enables easy and stable focusing.
  • With the included adapter, this results in a back focus of 55 millimetres which is ideal for DSLR cameras, as shown in the application example.
  • The two pre-installed wide prism rails (Losmandy standard) allow mounting on large mounts and further adaptation of accessories, for example on a telescope for visual inspection.

It is not only important which telescope you buy, but also where you buy it.

We provide extra help:

  • We are a leading telescope dealer and know these instruments like the back of our hands.
  • We are always very happy to offer our assistance after your purchase, should you encounter any problems with your telescope’s setup or operation.
  • Our ‘Telescope Basics’ booklet - an 80-page beginner's guide for our telescopes – is provided free of charge with every telescope we sell.
Rear View - the telescope has been optimized for astrophotography and has no focuser.
Cross-section through the light path
Fully Corrected Field
Included accessories

Typical application


Recommended accessories:

accessory details
xmas tree

Right of return up to January 31 2022!