M109 Spiral Galaxy in Blue Light at 5760mm focal length

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Taken on March 11, 2005 from my backyard in Castro Valley, California

Compact Collapsible Cassegrain 18" @f/12.60 (F=5760mm), image scale = 0.49 arc-sec/pixel

ST10XME camera @-30C

FLI CFW1 Filter wheel

Optec  IR-Blocked Blue filter

13 exposures of 10 minutes (binned 2x2)

Two hours ten minutes total exposure time

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