A 100mm APO refractor will go for upwards of $1500. Unfortunately, they’re also expensive (and heavy) for large apertures. This really comes down to focal length and price. The other question would be why choose this over an APO refractor. Pricing tends to be similar to comparable sized RCs. Note that there are coma-free SCTs available at larger apertures. The AT6RC does have a little of this as well, fortunately Astro-Tech also makes a field flattener for $150 that works exceptionally well with these scopes. While there are coma corrector & field flatteners available for SCTs, the example images I’ve seen still show a lot of elongation at the edges of the field. The big reason to choose an RC over an SCT is the flatter-field, no-coma imaging. Given I still use a little Celestron CG-5 EQ mount, I felt going over 25 lbs when adding the cameras and guide scope would be pushing the mount a bit much. The RC is heavier than an SCT of the same size, which also made me opt for the 6″ version instead of the larger 8″ (13 vs. (The Ritchey-Chrétien design is what’s used by the Hubble and most other large aperture professional instruments.) The AT6RC is the baby of the bunch, and with an entry price of only $399, putting it right next to similar sized Schmidt-Cassegrain telescopes from Celestron and Meade. Why choose a Ritchey-Chrétien Astrograph?Īstro-Tech makes a range of Ritchey-Chrétien (RC) telescopes that are all designed specifically for imaging. After having a few good nights of imaging to test it out, I’m happy to say it has lived up to expectations. You may have seen my first impressions and unboxing of this telescope. DISCLOSURE: This post may contain affiliate links, meaning when you click the links and make a purchase, we receive a commission.
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