Adam AP Mach 1, Rob Miller TRI36L, Celestron 8" Edge HD Hyperion 17mm, Celestron 40mm Plossl, TMB 7mm & 9mm WO 66, Lunt LS60/B1200 PT, CG-5 Clone STF-8300m Pro Package, Honis-Modified Canon XS, Un-modded T1i, SSAG, TSOAG9, SX LodestarLackawanna Astronomical SocietyMy Astrobin
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Tak AP QSI Canon
Quote:I understand the collimation part and it is a concern, but if you want a scope this fast, there are few options. As for camera spacing, it seems like you only have to get that right to start with and then image away.
Celestron 8SE Dobstuff 13.1": Swayze refigured Coulter mirror, 6 pt mirror cell (2 pt edge support) and CF focuser board made by me StarBlast 4.5 ST80/PortaMount II Zhumell 20x80/Oberwerk 15x70 on a Seronik-style tripod boom mount Hubble Optics 18 inch F/4 mirror.
Quote:I have been wondering about that. According to ASA their Keller corrector can be used with any newtonian between f3.5 and f5 so it should work with the AT8in. Even more interesting for me would be how it works with the at6in.http://www.teleskop-express.de/shop/product_info.php/language/en/info/p4685_A...Andy
Quote:I don't think I've heard of a single report positive or negative.
Quote:I have been puzzling about the small fast Newtonians sold for imaging purposes - Orion and Astrotech offer a variety of F/4-ish Newtonians for this purposes in sizes from 4.5 inches to 8 inches. But the these have focal lengths (and thus field curvatures) of 450 mm to 800 mm, and I calculate that the sagitta across a 12 mm sensor is larger than the depth of focus by a factor for 1.5 (8") to 3 (4.5").It would seem that getting an in-focus image across a modest sensor chip is impossible without something to flatten the field. Paracorrs allegedly do this for scopes 1200mm and larger, but would perhaps not help much with these very short focal lengths. There also seem to be no field flattener products marketed specifically for Newtonians.
Zad Sky-Watcher USA 10" Collapsable Newt Orion 8" f/3.9 Imaging Newt Celestron C4-R (4" f/10 Acro Refractor) Celestron Omni XLT 150 OTA (6" f/5 Newt) Atlas EQ-G - Hypertuned 50mm finder/guidescope w/modified webcam CG-4 Mount with drive units Meade RB-60 for manual guidescope Canon Digital Rebel XT (350D)- Self Modified
AP900GTO, AP1200GTO, DM6, Tak Epsilon 160, 12.5" F/3.8 AG Optical Newtonian, C9.25, 8" LX200GPS, 18" Starmaster w/Zambuto F/4.3, ES ED127mm CF, FS60C, SV80 FLI ML8300, QSI640WSG-8 SX Lodestars Some Uncle Al's glass hand grenades www.doghouseastronomy.com