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Exposure times
I am curious about exposure times...
If I use a 10 mm lens I can expose a star photo for 30 seconds or so, any longer and the sky would be over exposed and too bright.
If I use a 90 mm lens then 10 seconds or so gives dark sky but trails, so if I were to buy a tracking mount It would eliminate the trails but if I leave the shutter open for 1 minute whilst tracking wouldn't that over expose the skyor is it all about taking a series of 30 second exposures with the tracking and then stack them together, if so then would it be just as easy to take a three hundred exposures at 10 seconds instead of 10 exposures of 30 seconds, When opening the shutter for more then 10 seconds or so what role does aperture play??
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