Stellar imaging with an unmodified webcam

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rwilkinson
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Stellar imaging with an unmodified webcam

#1 Post by rwilkinson » Sun Feb 27, 2011 10:04 am

I've been following Dean's recent experiments with his umodified SPC880: http://www.boltonastro.org.uk/Gallery/t ... p?album=53
He's made a little bracket to mount the lenses from his Olympus (film) SLR onto his webcam, similar to this one I made for my TouCam:
teletoucam.jpg
TouCam ProII fitted with Tamron 28-80mm lens
teletoucam.jpg (54.29 KiB) Viewed 3202 times
which gives a field-of-view a few degrees across.

But with an unmodified camera, the limit is that the slowest exposure available is 1/25-sec - yet stacking a few hundred of these can get objects down to 7th-magnitude.

However we'll soon see the difference when he gets an LX-modified camera...

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rwilkinson
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Re: Stellar imaging with an unmodified webcam

#2 Post by rwilkinson » Sun Feb 27, 2011 10:09 am

We did initially have problems trying to stack his raw images in IRIS - with the gain wound up full on his camera, the background noise was so high that the automatic Stellar registration couldn't pick out the stars for alignment. :-(
But the Setfindstar command can be used to change the threshold for star detection, and using lower values sorted out the problem. :-)

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