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Comparison of RF 1200mm f/8 L and EF 600mm f/4 L II with 2X III

Started 6 months ago | Discussions thread
John Crowe
John Crowe Veteran Member • Posts: 3,476
Re: Comparison of RF 1200mm f/8 L and EF 600mm f/4 L II with 2X III

This was discussed not too long ago.  It was very entertaining.

Do let us know how you make out.  Additional CA is likely easily corrected.  I always try to stop down one additional stop with teleconverters, so be sure to try that too.

My concern is how the AF performs with the 2x.  I have found on other lenses that a 1.4x has much less effect on AF.

 John Crowe's gear list:John Crowe's gear list
Canon EOS 5DS R Canon EF 70-200mm F4L USM Canon TS-E 17mm f/4L Kenko Teleplus Pro 300 AF 1.4x Venus Laowa 12mm F2.8 Zero-D +15 more
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