NGC7635 in Halpha from Stinger 450 mm Classical Cassegrain used at f/7.3 and FLI ML4022 with Custom Scientific Filter

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FIT data here (raw calibrated stack)

Taken on September 10, 2010 from my ranch in the California Sierra Gold Country

Stinger 450 Classical Cassegrain 450mm f/12.6 used at f/7.3 (3366mm)

Astro-Physics AP1200GTO mount

Lumicon Giant Easy Guider with Focal reducer for final: F= 3366mm, f/7.4

Finger Lakes Microline ML4022  imaging camera operated at -25C

Robofocus

Finger Lakes CFW7 Filter wheel

SBIG ST7E guide camera

Custom Scientific 4.5nm 50mm round Halpha filter

6 exposures of 15 minutes Halpha

1 hours 30 minutes total exposure time