Eye of the eclipse...

by darkhausen

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The SLT A58 has the so-called "long exposure noise reduction" function which performs the dark frame subtraction mentioned in Micheal's Clark's answer. You should choose the shutter speed a lot less to prevent start trails (A few seconds at most, depending on the focal length) and crank up the ISO instead. That will dramatically increase the noise, but you ...


The best way to deal with noise in the situation you describe is to use a form of dark frame subtraction. If your camera doesn't offer such a built in feature, then take a few frames during your session with the lens cap on (using the same ISO, and shutter time). Then use an application in post processing to subtract the dark frame from each segment from the ...

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