Quote:
Originally Posted by vachss
Your results are certainly good enough that you don't need my advice anymore, but I think you could get away with higher ISOs to shorten the exposure and reduce trailing. While you'll certainly have noise at ISO 1600-3200 it can clean up pretty well in post, while star trails are harder to get rid of.
Another thing you can play with if you just have a sky image with no ground background is stacking a bunch of relatively short high ISO exposures to reduce noise. Each shot will rotate a bit from the previous one just like a star trail, but the individual shots can be free from trails. For instance, you could go to a very high ISO like 6400 and shoot 16 shots in a row each for 10-15 seconds. A stacking program will overlay the exposures and take out the interframe rotation (and, hopefully, much of the noise).
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1: I need all the help I can get
and your advice while I was there helped.
2: I fear photoshop and would have to pass the stacking on to my son. I know the same works for stacking focus to get incredible dof.
3: ISO noise, hopefully a different camera body would help with that.