TEC140 APO Refractor
Losmandy G11 Gemini 2
SBIG STF-8300M, Atik EFW2 Filter Wheel, Atik OAG, Lodestar Autoguider, Astrodon 1.25" LRGB/SII/Ha/OIII Filters
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:Hi-I think this is a great thing to try and it worked well. I rarely see refractor imaging at f/11, or with OAG - and this is both. It looks like you have a lot more detail than you would have had without the extender and without OAG, so you are getting the benefit of both. At the same time, in terms of deep enough sub-exposures you do need to go longer at higher f/ratio - and that effect is very real. But that is a tiny little thing and it looks like it benefitted from the added effort.Nice thing to try - and looks good to me.Frank
Warren - Stargazing since the 60's! Scopes: ETX-LS6, ED80T, AT6RC, Lunt LS60T, C9.25 Mounts: Atlas EQ-G, Vixen Portamount II Cameras: Atik 314L+,DMK31AU03,SSAG, ASI120MC Filters: Astrodon LRGB, Orion HA, SII, OIII Acc: Orion 5 place Filter wheels x 2, Flatman Primary Imaging site: Bortle Scale Class 6 Red Zone http://astrobin.com/users/rigel123/
At the dark side of art, J-P Metsavainio, Finland LX200 GPS 12", SkyWatcher ED80, Canon 200mm EF f1.8L, Tokina 300mm AX f2.8, SXV-AO, QHY9, QHY8, QHY5, Lodestar BLOG:http://astroanarchy.blogspot.com/ IMAGE PORTFOLIO:http://astroanarchy.zenfolio.com/ FACEBOOK: http://www.facebook.com/jp.metsavainio
Quote: Perhaps I should next try to image NGC772 without the extender and compare the results.