Omdat ik geen Canon heb, kan ik je alleen maar helpen door op Internet te zoeken. Hier heb ik iets gevonden
http://www.stevesforums.com/forums/view_topic.php?id=581507&forum_id=65Voor als je het verhaal niet helemaal wilt doorworstelen, hierbij de conclusie van 1 van de deelnemers:
I owned the Canon 100mm USM Macro, the Sigma 105mm Macro, and the Sigma 150mm macro. I also extensively tested out the Tamron 90mm Macro, Tokina 100mm Macro, and the Vivitar/Phoenix 105mm f/3.5 Macro as well. The 50's just were not long enough and whilst I fell in love with the 180mm Sigma macro it was just too much $$$.
But in the end I snagged up the 150mm Sigma and never thought twice about it! The Canon just wasn't worth the extra $$$ over the Sigma 105mm and the 105mm just did not give me the working distance nor focusing speed I desired (AF for other uses then macro) so I ended up with the 150mm Sigma. It honestly is, hands down, the best Macro lens out there when you take all things into consideration!
I do have to add that the Phoenix 105mm Macro lens actually performed most excellent!! I was amazed, shocked is more like the word, on how great the optics are!! BUT, and a big BUT too, the build quality is kind like a toy, sadly. But the lens would hold up fine and be fine for in studio work, but not sure how well it would last in the field.
But anyways, here would be my list from best to last.
1. Sigma 180mm f/3.5 EX DH HSM Macro
2. Sigma 150mm f/2.8 EX DG HSM Macro
3. Tokina 100mm f/2.8 AT-X Macro or Sigma 70mm f/2.8 EX Macro or Canon EF 100mm f/2.8 Macro or Tamron 90mm Macro
4. Vivitar/Phoenix 105mm f/2.5 Macro (but only for studio/product shot usage and very light outdoors use).
The Sigma 150mm also works great with a 1.4x TC or 2X TC stacked for extra mag. and focal range as well as a 1.4x TC + Ext. Tubes for greater then 1:1 ratios.
As for light.. I use reflectors and natural light preferably. If not then I use a Stroboframe Flash bracket with an adjustable flash mount and have it bent forward then curved with the flash mount, and of course diffused. Another choice is a ring light or ring flash unit. Or you could even snag the Bogen / Manfrotto 3278B Macro Flash Bracket for like ~$50us.
As for hand held shooting of macros, it can be done, even with the 150/180mm lenses with proper technique and enough light, but tripod, monopod, shoulder/chest pod is highly recommended.
Let op! De prijs was hier een factor die wel degelijk mee telde. Als dit voor jou minder geldt, kom je wellicht tot een lijstje...

Heb nog een andere site gevonden:
http://www.the-digital-picture.com/Reviews/