When I take mine for swaps, I usually trim the photo. It allows me to do a couple of things. First, I can put some multi-colored items in the outer areas of the picture. It helps to keep the color balance. By trimming, it will bring out the fine details of your subject when you post it on a bulletin board or online. It gets larger instead of smaller if that makes sense.
I am able to use my flash very often, but there are a few colors (like yellow) that will completely wash out if you aren't paying attention.
Also, when I bought my canon powershot, I tried all of the macros out there, and liked the canon the best.
My keys: Lighting, tripod, macro lens.
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