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  1. M

    CANON 100f2.8 is usm

    Apologies the sigma does fit but there was a nasty sound coming from the focusing action on the canon 100 f2.8 is ism lens. I obviously stopped very abruptly at that stage of the test. So be careful people! Kind regards mike
  2. M

    CANON 100f2.8 is usm

    Thankyou for your replies, thus the sigma 1.4 doesn't fit The kenko 1.4 pro 300 DGX does fit. And maintains a/f Tried these in shop on my canon 100 2.8L is usm today Thanks again mike
  3. M

    CANON 100f2.8 is usm

    Hi please correct me if I am wrong I believe this lens cannot adopt a 1.4 converter? I am hoping someone knows better? And if it does will it retain A/F. Not from the canon camera point of view. IE is the converter fully electronic? Kind regards Mike.
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