Monday, June 4, 2007

A couple of videos

I thought it would be interesting for anyone who hasn't yet tried lunar/planetary imaging to see what the raw video looks like coming out of a DMK21AF04 camera. You can get an idea of how much things move and shimmer around. The first video is the area of the moon around Tycho and Clavius. This video was taken in my Celestron C8 at the native focal length of 2032mm @ f/10. Things look pretty steady at this focal length:

Now let's crank up the magnification by adding a 2X barlow with a 2" extension between the barlow and the camera to increase the overall magnification to about 3X. At around 6000mm focal length, things start moving around much more and the tiniest little bump of the tripod or scope shakes the image pretty badly for 2-3 seconds. Also, the image becomes darker, requiring longer exposures and some extra gain:

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