LensTip.com

Lens review

Canon EF 100 mm f/2.8 L Macro IS USM

27 November 2009
Arkadiusz Olech

10. Autofocus

As we deal here with an L series lens, equipped with an USM motor our expectations concerning the autofocus work are high, especially that we put the lens on the EOS 1 Ds MkIII first.

Let’s start with a remark that, as it befits a good macro lens, we’ll find the focus distance limiter on its barrel . We can choose from three options: a 0.3m to 0.5m range, a 0.5m to infinity range and a 0.3 to infinity range. In the case of the latter, going through the whole distance scale takes about one second. On the one hand the lens is not exactly a speed demon on the other hand the range is very wide indeed. If you care about fast work you should use the limiter. After choosing the work mode for greater distances the autofocus increases its speed almost twice.

On the EOS 20D the lens operates with the same quickness and as silently as before. A two digit body autofocus is worse though because the mechanism gets lost more easily and it goes through the whole scale looking for the right setting more often.


Please Support Us

The coronavirus crisis has been adversely affecting many businesses and, sad but true, ours is not an exception. Despite that difficult situation we would like to preserve continuity and high quality of publications available on all our websites. Still, we are now aware it might be impossible without additional financial help. That's why we would like to ask all those who visit, read, and care about Optyczne.pl, LensTip.com i Allbinos.com for support - it's enough you send us a small sum of money via PayPal. If a lot people decide to support our websites we think we'll stand a chance and survive next months without any lasting harm. We count on your support and understanding, stay safe and be healthy.

- - - - - - - - - - - - - - - - - advertisement - - - - - - - - - - - - - - - - -

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

How does the lens fare when it comes to the autofocus accuracy? On the 1Ds there’s really nothing to complain about. The lens didn’t miss one single time during the studio shots! On the EOS 20D it fared a bit worse, though – the number of misses reached 3%. It is still a very good result. What’s interesting the 100L autofocus work is so good that an exchange from 20D to 50D won’t improve it significantly – on the 50D the number of misses is again about 3%. Such a result must be assessed as very good once again so the tested lens’s focusing mechanism we find beyond reproach.

The EOS 20D doesn’t have any possibility to calibrate front or back focus but that particular option proved to be redundant here – the lens didn’t show any front or back focus tendencies, either on the 50D or on the 1Ds MkIII.


Canon EF 100 mm f/2.8 L Macro IS USM - Autofocus

Canon EF 100 mm f/2.8 L Macro IS USM - Autofocus