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I'm into reefkeeping. I have a 90 gal saltwater tank and a 39 gal tank. I'm looking for a good macro lens to take pictures of fish and corals. My main concern is that I cannot use a flash of any kind because of the reflection of the glass on the tank. I'm looking for something that I can use close to the glass. My 90 gal is 24 inches deep but most of what I will be photographing is in the first 2/3 of that distance. I was looking at the Sigma 70mm, the Tamron 90mm, and the Pentax 100mm but really dont want to spend the 800.00 that would take.
Right now I've been using my Cannon G12 because I can shoot raw format and it has a pretty good macro function but want something more dedicated.
This will mount on my Pentax K7.