New answers tagged astrophotography
2
You want to build a barn door tracker. This is a simple device made from parts around the basement and for really crude ones you don't even need a motor, just turn a crack every minute or so. 10mm is so wide that a manual crank just might be good enough.
Astronaut Don Pettit even built on on the ISS.
Just googling around will show a whole host of plans. ...
1
Here are some tips from these websites:
http://www.jamesvernacotola.com/Resources/How-To-Photograph-Star-Trails/12233655_V7cX4D http://www.nikonusa.com/en/Learn-And-Explore/Article/h0ndzhvw/photographing-the-night-sky-star-trails.html
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There is no substitute for per-image SNR (Signal to Noise Ratio). A half-second exposure following the 600 rule won't be enough. You have to factor in read noise as well as photon shot noise. Photon shot noise can be delt with via stacking, but read noise...read noise diminishes detail and in the deeper shadows, can eliminate it entirely. With half-second ...
2
You could try something like DeepSkyStacker. I have not personally used it, but I had it recommended to me by someone after some night shots I took. My understanding is that you take short photos from a fixed position and it can apply the appropriate position adjustments and stack them for you to produce a final image.
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