Hehheh, Stan, I do AF on small fishes when I am lazy.That's where the 60mm EFS come in. Extremely fast and accurate. Hand-held.
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Jeff,
buy what you need. Not what others say. Else you will drop into that BBB hole and buy things that you find yourself keeping in the dry cabinet. Just to let you know about the dangers of SLR photography first. keep your focus!
But, yes, 50mm can be used for fish photography. But like I say, and I say again, all lenses can be used for fish photography once you solve the problem of light.
Another limitation about lens focal lengths you need to remember is the combination of your physical working area (meaning space around you) and size of fish. Too long a lens on a big fish with no space to work, you can't shoot the whole fish. Too small a fish with too short a lens, you go super close to the glass and the subject still small in your picture.
So for the case of Stan shooting his discus, the 50mm will work nice for him. A 105mm might be too long if he has a short physical working space in front of the tank.
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