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FSQ/IMG6303 shot This work: 18" Cassegrain
[SII] Ha [OIII] f/12.6, IMG6303 binned 2x2
3.5 arc-sec/pixel 0.64 arc-sec/pixel
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for details of FSQ shot click here
Closeup taken on November 27-29, 2004 from my backyard in Castro Valley, California
Seeing conditions were worse than average, stars measured at 3.2arc-sec FWHM
Compact Collapsible Cassegrain 18" @f/12.60 (F=5760mm)
IMG6303E camera @-42C
AO7 @ 12 Hz
RCOS Dichroic beam splitter
ST7E guide camera
FLI CFW1 Filter wheel
Optec TCF-S focuser
Custom Scientific AR-coated 3nm FWHM Ha filter
7 exposures of 45 minutes through Custom Scientific Halpha filter (binned 2x2, scale=0.64 arc-sec/pixel)
five hours 15 minutes total exposure