Terry Danks Photography: Birds, Scenery, a little astrophotography too. http://danks.netfirms.com/home.htm Equipment List: Too embarrassed to list it all. Roll-off-roof Observatory Constructed Fall, 2013
Dan Crowson - Dardenne Prairie, Missouri
Astro-Tech AT6RC Ritchey-Chrétien / AT90EDT - 2.5" Moonlight CSL
SBIG ST-8300M w/FW8-8300 & OAG-8300 w/ST-i
Imaging mainly from a Red Zone
Mach1GTO / G11/G2 (stock) / AT6RC / AT10RC / TMB92SS / Astrodon 50D / STT-8300M / FW8G-STT / PixInsight / etc, etc. Astrobin - Flickr
Quote:i wonder if this means your (or my) primary mirror position is wrong relative to the secondary?
Quote:oh - i'm not sure 500-700 feet is really far enough away. can you see something a few miles away?
ASTRONOMY MAGAZINE STAR PRODUCT OF THE YEAR 2011 Vendor of the Boren-Simon POWERNEWT Astrographs www.powernewts.com www.pbase.com/tango33 Scopes: 6",8",10" F/2.8 Boren-Simon Carbon-Fiber POWERNEWT 8" GSO Carbon RC Mount: ASA DDM60 PRO NEQ6 Mount Camera: SBIG ST8300 M with BAADER LRGB Ha-O3-S2 filters ORION STARSHOOT PRO 2 ( color)
Quote:I focused the AT8RC last night, using the 2" Agena extender.Focus occurs with the SBIG FW8 face plate 227mm back from the rear of the AT8RC back plate. This was with the Astrodon 3mm Ha.