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  1. Richard Ford

    Canon MKIII convertors experiences please

    Additionally anyone used convertors on the Canon EF 400mm f2.8 L IS USM? A nice lens to have, but weight may also be an issue. Thanks for any input. I'm lucky to be in a position to upgrade my gear at the moment so I'm looking at views on these lenses and convertors specificall for wildlife...
  2. Richard Ford

    Canon MKIII convertors experiences please

    Thanks all, really useful comments. If its genuinely the case that I have nothing to gain between MKII and MKIII convertors when using on a Canon EF 500mm f/4 L IS USM then I can save a few £ there so thanks. I've read that IQ is better around the corners and edges on MKIII 2x and new versions...
  3. Richard Ford

    Canon MKIII convertors experiences please

    I use Canon 90D and am looking to hear about direct experiences using the below lenses and converters. I'm wary of convertors but I hear the new MKIII have less issues with IQ and AF than previous models. Canon 500mm f4 MKI plus 1.4x mkiii seems to have a good rep for results. Any idea how...
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