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How good is 300 4 L IS for R6 ?

Started Apr 27, 2022 | Discussions thread
John Crowe
John Crowe Veteran Member • Posts: 3,476
Can only comment on non-IS version.

I have only used the EF 300/4 L and EF 300/2.8 L, both non-IS, and both on the 5DSR.

The f4 is almost as sharp as the f2.8, and AF appears to be very similar.  AF on the f2.8 with EF 1.4x seems a bit better than the f4 and EF 1.4x.  I often used both for tracking/panning race cars and motorcycles at high speed with great success.

The 5DSR autofocus should be well behind the R6, so you should see improvements beyond my experience.  The RF bodies are said to improve AF of all EF lenses.

The IS lens elements, of the 300/4 L, are said to have reduced IQ marginally  Personally I have no use for IS, so IBIS may in fact be good enough for your purposes, with the non-IS.

 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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