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22-10-09, 07:36 PM
Join Date: Jul 2009
The sigma 105mm with ring flash is a disaster in the making! The lens moves so far that if you're leaning over the subject the lens motor will not be able to retract it again, leading to either burn out or premature failure.
Canons excellent 100mm Macro can be bought for £420 (Jacobs) while the Sigma costs £356 (Amazon) For me that's not enough price difference to even consider the Sigma. While it is capable of giving some very good results, the Canons benefits are a lightening fast accurate internal focus, even better image quailty and it's an OEM part so you know it will continue to work on all Canon cameras. It will accept ring flash and the twin head macro unit.
Flash is really a necessity for good Macro photography, you can do it without, but the small apertures required and the fact that you are so close means that at macro magnification the aperture the camera sees is in fact double that which is indicated - light really is at a premium.
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