07-07-2010, 09:22 AM
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also, you may have all the information within the picture but it just displays as poor. Photoshop can make the adjustments to the picture by changing the levels, contrast, color, etc. A perfectly " ruined " photograph can be salvaged and brought back to life through photoshop - and since your using a 30D all that information should be there for a great picture to be taken.
Also, since your trying to follow the fish for a picture you may get something out of focus. I always try and predict where the fish will go. Each develops some sort of swim pattern IMO and once you adjust your settings you can predict where the fish will be so your not chasing it around. I've also heard of people shooting at night using either a higher ISO or a slow shutter speed while the fish sleep.
I'm curious, what lens are you using? :)