Overview of the Orion 12" Truss Tube Ritchey-Chrétien Astrograph

12" (304mm) aperture, f/8 Ritchey-Chrétien optics housed in a thermally stable carbon fiber Serrurier-design truss tube assembly.

For our US and Canadian customers - http://bit.ly/2N4gdSM

The new Orion 12" f/8 Truss Tube Ritchey-Chrétien Astrograph features premium quartz mirror optics housed in an ingenious truss tube support structure originally developed back in 1935 for the 200" Hale Telescope at the Palomar Observatory! This exquisitely engineered telescope is optimized for large-aperture astrophotographic excellence - and will take your imaging pursuits to a whole new level!

Unlike conventional Newtonian reflector and Schmidt-Cassegrain designs that are susceptible to displaying coma away from the center of the field, the Orion 12" f/8 Truss Tube Ritchey-Chrétien Astrograph utilizes hyperbolic primary and secondary mirrors to achieve wonderfully flat images that are virtually coma-free. Plus, since there are no lenses involved, images are delightfully free of chromatic aberration, for true-color performance. Both the 12" (304mm) primary mirror and the secondary mirror are figured from low-expansion quartz glass and boast enhanced aluminum coatings to provide 96% reflectivity. The primary mirror is fixed in place to eliminate annoying "image shift" that plagues Schmidt- and Maksutov-Cassegrain telescopes. The secondary mirror is precisely center-marked to facilitate collimation.

The Serrurier carbon fiber truss system is thermally very stable, minimizing the effect of ambient temperature changes on the telescope's focus. Plus, since it's an open tube, the optics cool down faster than solid tube versions. The Serrurier system utilizes two sets of opposing truss tubes on either side of the declination pivot plane, which keep the optical elements parallel to each other no matter how the telescope is oriented, thus keeping optical collimation precisely intact. Stainless steel ball and socket hardware connects the truss tubes to the telescope's three large CNC-machined aluminum support plates.

The focuser on the Orion 12" f/8 Truss Tube Ritchey-Chrétien Astrograph is a masterpiece of rigidity and precision. The CNC-machined 3.3" dual-speed (10:1) linear bearing Crayford focuser features a stainless steel rail on the drawtube that provides extra support for up to 9 lbs. of imaging gear without flexure or slippage. The focuser can be rotated 360 degrees for image framing. Both 2" and 1.25" non-marring compression ring accessory collars permit the use of 2" or 1.25" accessories.

This video provides an overview of our Orion 12" Truss Tube Ritchey-Chretien Astrograph. We offer several other astrophotography telescopes, many of which are described in these videos:

Features of the Orion 6" Ritchey-Chrétien Astrograph
   • Features Orion 6" Ritchey-Chrétien As...  

Features of the Orion 8-Inch Ritchey-Chrétien Astrograph
   • Features of the Orion 8-Inch Ritchey-...  

Features of the Orion 10-Inch Ritchey-Chrétien Astrograph
   • Features of the Orion 10-Inch Ritchey...  

Overview of the Orion Premium 190mm f/5.3 Mak-Newt Astrograph Telescope
   • Overview of the Orion Premium 190mm f...  

Overview of the Orion ED80T CF Triplet Apochromatic Refractor Telescope
   • Overview of the Orion ED80T CF Triple...  

Overview of the Orion EON 115mm ED Triplet Apochromatic Refractor
   • Overview of the Orion EON 115mm ED Tr...  

View our complete selection of astrophotography telescopes:
http://bit.ly/2UZpRct

To be notified when new videos are added to our growing library of stargazer how-to videos, subscribe to the Orion channel!
   / oriontelescopes  

Visit https://www.telescope.com to find high quality products for amateur astronomers.

If you have any questions about any of our telescopes, binoculars, or accessories, please don't hesitate to contact one of our trained and knowledgeable customer service representatives.

https://www.telescope.com/custserv/co...

To learn more about Astronomy, please visit the Orion community where you can find Articles, Images, Videos and More!

https://www.telescope.com/catalog/com...

Since 1975 Orion Telescopes & Binoculars has been offering telescopes for sale direct to customers, with an unswerving commitment to best quality products, value and unmatched customer care. Our 100% satisfaction guarantee says it all. Orion offers telescopes for every level: Beginner, Intermediate, Advanced, and Expert. From our entry level beginner telescopes for amateur astronomers to our Dobsonian telescopes to our most advanced Cassegrain telescopes and accessories, you can find the best telescope for you.