My gear: --Celestron 8EdgeHD & 11EdgeHD | 80mm F/6 Triplet | Modified Canon T1i | QSI683WSG-8 | QHY5L-II | Celestron AVX mount | iOptron CEM60 mount | iOptron ZEQ25 mount --- My skies:
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/
Robert The more I learn, The more there is to learn! Orange Zone Dark Site 3 Mounts 4 Imaging Cameras 3 Guide Cameras OTA's = yes
Clear skies - Jim Crazy PNW imager !
A-P Mach1 on 12" concrete pier - ROR structure.
Tak FSQ85-EDX, Tak FS-128. Orion 8" f/3.9 w/MoonLite motorized - MPCC MkIII CCD:
SBIG 8300M/FW8, Astrodon 36mm LRGB, 5nm Ha, 3nm SII, OIII - Canon EOS 6D unmod SSI3, SSAG,
Skytools3pro, MaxImDLpro, PSCS5, PSPpro, TheSkyX, TheSky6, BYE, StarTools
Orion XX14g -for visual- diags, ep's, accy tubes, Binocs .
Quote:Shutter effect is when the light region is out of round, and you'll be able to see it easily. I'm curious - is it that long for all the NB filters? Wonder if the light source is maybe not a very broad band? or the reflective surface?(not to derail anything but Happy Birthday Robert!)
Quote:For the LRGB I am typically at 1-1.4 seconds to get an average of about 33000. When I move on to my O3-S2 filters I am finding that to get over 20K I need to do at least 60 seconds. What am I doing wrong?
Check it out! I can form a full sentence! Scopes: Explore Scientific 152mm f/8 Carbon Fiber Triplet, Obsession 15" Classic Camera: SBIG ST-8300M, SBIG FW8 Filter Wheel, Astrodon LRGB and 3nm Narrowband Filters Mount: AP900 Hang out with us at Mount Lemmon Sky Center
Quote:And not to try to add to any confusion - but are you 100% certain you're at exactly the same focus position you will be when taking light frames? Not so much of an issue if nothing major moves (i.e. you have a fixed primary mirror), but in some situations it can appreciably change the outcome of the flats.Grant
- Jared Willson
Quote:The problem is the NB filters require such long exposures there is really no way to get enough of them. At least that is the issue I am running into.