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Wide Field
Constellation Cygnus and the Milky Way

Constellation Cygnus and the Milky Way (Place the cursor over the image to get the stars name)
Object : Constellation Cygnus and the Milky Way
Date : 2007-08-25
Time (UT) : 22:16 to 22:45
Mount : EQ4
Lens/telescope : Pentacon 50 mm f/1.8 (set to f/4.0)
Corrector/Barlow : none
Field (FOV) : 24x17 degree, before cropping
Filter : none
camera : Canon 350D
Film/CCD : Raw iso800
Exp. time : 5x15, 5x60, 5x240 seconds. Controlled from "Shutter Sequencer" as an alternative I could have taken 105x15 seconds exposures, but it had given more noise and less dynamic.
Image process tool : IRIS (advanced free tool)
Processing : bias, dark and flat corrected, HDR (High Dynamic Range), log, blur (for the color)
Weather : Just a few clouds
Site : Sweden, Stockholm, Midsommarkransen. Bortle 9
Comment : It is fantastic what a digital camera and a computer can do! Sky with light pollutions and it wasn't even free from clouds, the lens is over thirty years old.
It's processed in IRIS and the HDR function is used to stack them together to keep the dynamics. The image field is about 25 by 16 degrees.
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