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Hi Bob,
Just wanted to say thanks for all the tips. I used a four flash setup this weekend to shoot some local ruby throated hummingbirds and got a decent result (attached). I experimented with backgrounds and decided using a matching flower to the bait was what I liked best. Details - 5DMKIII, 300 2.8 II w 25mm extension tube, f16, 1/200, flashes set at 1/32 power.
Cheers