Astronomy, Photography and Weather
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Star Trail

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brianb
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« on: February 21, 2009, 06:28:30 pm »

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Had you forgotten the tripod, Brian  ? Lol.
No --- the camera was going to to an Astrotrac driven mount but it's easier to focus up the scope then clip the camera onto the head. (The top head is a Manfrotto 405 geared head which provides slow motions in RA & Dec for aiming the camera, but sometimes things get into awkward positions). I know from previous experience that my Canons are sensitive enough to autofocus on a mag 1 star provided that they're set to use the most sensitive (centre) AF spot. Waving the camera by hand is good enough to get the focusing done - then switch to manual focus to lock it. This time the shutter fired "unexpectedly" .... done this lots of times & it's the first time I've had an "accident".

I'm quite pleased with the effect!
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