For serious astrophotographers, an optical tube that has quality optics and suitable specifications is key to producing successful images. Astrographs come in many different specifications and designs, so each model can be oriented or preferred for a different type of imaging (eg. solar, terrestrial, deep sky etc). Some common designs include the Ritchey-Chrétien, Riccardi Honders, and Catadioptric optical tubes. Choosing an astrograph depends on how the astro-imager wants to observe, what focal length and focal ratio it has, aperture, optical coatings, and how suitable it is for the camera they intend to use.
A key specification very important to consider when choosing an astrograph is focal ratio in relation to aperture. This is an important to remember because focal ratio determines what the magnification and field of view the observor will get. Therefore, if the observor intends to mainly view deep sky objects with lower surface brightnesses, a shorter focal length will reduce magnification and increase field of view since most deep sky objects tend to appear very large but not bright. Astrograph telescopes with slower focal ratios such as an f/12 will provide higher magnification and smaller field of views; better for planetary observing.
Developed by Astro-Tech to make large-format CCD imaging affordable for the amateur astronomer, the Astro-Tech AT10RCF is priced thousands of dollars less than the formerly least-expensive 10” R-C. The Astro-Tech AT10RCF is the first truly affordable large aperture true Ritchey-Chrétien astrograph available from a U. S. company. Even better, despite its low price, the Astro-Tech-developed AT10RCF has many of the same premium features as the much higher-priced competitive RCs (and some they don’t have) – like quartz mirrors, dielectric mirror coatings, carbon fiber body, and more.... Learn MoreFREE SHIPPINGModel#: AT10RCF(48 States)
Optical tubes based upon the Ritchey Chretien design are known very well for their successfull astrophotography, and the 10" optical tube by Astro-Tech is no different! What is different is the price! This optical tube is boosting quality while saving you approximately $4,000! Astro-Tech has delivered top quality Ritchey Chretien optical tube astrograph for an affordable price! Some of the optical enhancements the observer gets when purchasing this optical tube include quartz mirrors, dielectric mirror coatings, and many more! Sky & Telescope magazine named this one of their "Hot Products" in 2010!... Learn MoreFREE SHIPPINGModel#: AT10RC(48 States)
Ritchey Chretien astrograph telescopes are exclusively used in many professional fields, including the HST. Astro-Tech has designed a 6" f/9 Astrograph that is based upon this design to the amateur astronomer at affordable prices. Due to its weight of 12.9 pounds and a supplied Vixen style dovetail, this astrograph is primarily compatible with virtually any equatorial mount, so there is no need to buy an additional mount specific for this scope.... Learn MoreFREE SHIPPINGModel#: AT6RC(48 States)
A telescope with high quality optics is key to great observing. However, a high quality telescope priced reasonably is less common. The Astro-Tech 8" Ritchey Chretien is a fabulous optical tube with an excellent reputation for being astrophotography friendly. The telescope features internal optics such as a carbon fiber external body, quartz mirrors, dielectric mirror coatings, and two dovetail mounting rails.... Learn MoreFREE SHIPPINGModel#: AT8RC(48 States)