p.1 #2 · Stars over Pandapas Pond (And Star Trails)
Paul, Depending on which camera you have will determin your exposure and limits of noise. If you stop down you'll get a longer exposure with out overexposing but might pick up more noise.
Yes, you can take multiple exposures. You can't have a gap in them though or it will look like you are trying to send morse code (Blind man speaks with photos in the sky). You can stack them in CS and them switch the layer blend mode to screen. That will let only the bright light pass through the layers. Paul, I like doing 15 min exposures with the 5DMII. The colder the night the less noise you will get to a certain extent.
p.1 #4 · Stars over Pandapas Pond (And Star Trails)
Steve, it's a D90. If I stop down, the trails won't be as bright though, correct? It's at f/4.5 (close to the max of the Sigma 10-20mm). The battery life of the D90 is pretty good--I am confident I can get 2 hours of exposure in with changing so as long as I quickly take the next picture in a series, I'd be fine? I take it you stack around ten 15 minute exposures?
How do I get the stars to appear brighter? Open up the aperture or boost ISO?
Tim, thanks for the compliments.
Nov 17, 2009 at 04:51 PM
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p.1 #5 · Stars over Pandapas Pond (And Star Trails)
perhaps some serious education is required!
with multiple stacks, we used to use the old `lighten` blend mode, this will show the next image in the stack. by using this method a gap will appear. even with the quickest finger on the release. this is due to the `lighten` mode not the time between frames.
Floris`s technique brings the best of both worlds and incorparates the `screen` mode in conjuction with the `lighten` mode on alternate layers. this fills in the gaps.
