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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
OP amm Junior Member • Posts: 37
Re: Comparison of RF 1200mm f/8 L and EF 600mm f/4 L II with 2X III
1

I purchased both 1.4X and 2X extenders as having both extenders were mandatory. However, I only used 2X with 70-200mm f2.8 couple of times till its novelty wore off. I never used it again with any other lenses. Perhaps because of seeing all the unsatisfactory test results I found on the internet with 2X extenders. Having seen Canon's 20K, RF 1200mm test results couple of days ago, motivated me to try 2xIII with EF 600mm II.

I was not feeling that good today (got my booster shot which is giving me chills and a bad headache), but I decided to try the EF 600mm f4 II with the 2X III on R7, before the weather get worse.

So here are couple of pictures. Both pictures are taken with the aperture wide open (forgot to try other settings). The focusing speed was OK, not very fast but I did not limit the range, I should have. R7 focusing would get confused every now and then when background was busy, but I have observed the same issue with the bare lens as well.

Among couple of hundred pictures that I took (some under high contrast situations), I did not notice any CA, even before using DPP4 which corrects it.

R7, EF 600mm with 2X III, f/8, 1/1250 Sec, ISO 1600

R7, EF 600mm with 2X III, f/8, 1/750 Sec, ISO 2500

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