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I've been thinking about it for ages deciding what to do as I already have the Sigma 105 and 150
I think it will be perfect for butterflies and natural light macro stuff as I dont like using flash
Mainly will be shooting butterflies which will be about half lifesize . What sort of shutter speeds will I get away with ?
Im guessing at 60th at half life size and about 125th at 1:1 should be OK and lower with practice
I was thinking about getting the Canon 100mm before the IS version came out as I prefer autofocus to manual as I'm a bit slow focussing manually. By the time I've got the focus the butterfly will have gone and the Sigma 105 is slow on autofocus too ! And mine was starting to get faulty a few times just made a wirring noise instead of focussing.
I hope its as sharp as my Sigma's they get superbly sharp shots
Pete