Wow, that's a beautiful bird Steve. Nicely caught.
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Getting some lens lust again too
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Just satisfied that urge. Swapped out my Sigma 70 F2.8 macro for the Canon 100 F2.8. and now I'm keen to get it into the field. I hope it's as good as the Sigma was for sharpness/colour, and total lack of CA.
The difference for me was the closest focus distance. To get 1:1 on the Sigma the object was just 3cm away, and often this was awkward. The Canon has a 14cm working distance. However, the canon has a really short focusing ring. About a 1/3 rotation, where the Sigma had 2 turns and made fine focus beautiful. Pluses and Minus'; always.
Trev