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Actually I worded my first post a little ambiguously, what I was wanting to say is that Canons 100mm IS works a little better that the others which do not work in macro. Nikon make the point of informing it's users to switch off the IS and use a tripod when shooting 1:1.
However in my experience of using the Canon for the past year on a 7D the IS is nowhere near as good as Canons quoted figures. Up the shutter speed to around 1/250th with high speed Sync flash and servo focus then you're then ok.
Just a point on the sync speed of the 7D, it's rather hit and miss if normal flash is used at 1/250th, often producing a black bar at the bottom of the frame.
Harry
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