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24MP FF pixel density is lower than the 7DII's 20MP APS-C sensor, so the image quality difference between the EF 100-400 and the RF 100-400 might not be as apparent.
JimClark wrote:
There are many advantages that made me think about switching but a big one for me is the improved focusing and weight. This 72 year old is getting tired of hand holding a 7D MKII and the EF100-400 II. 6LB 3OZ
Do you need a vertical battery grip on the camera? If not, then you might consider the R8 instead of the R6II. As mentioned, the R8 has the sensor and apparently also the CPU of the R6II, so AF performance is apparently the same. R8's user interface has been scaled back a bit with fewer input buttons/dial options, no AF point joystick, no battery grip, etc. But as mentioned, if you want to use it in e-shutter mode, it is as good as the R6II, which is the fastest sensor readout speed of Canon's cameras other than the top-end R3.
I had a quick look at various camera specs - the 7DII was about 2 lb, the R6II is about 1.5 lb and the R8 is about 1 lb. If you're just doing it for fun and not really pixel peeping, the RF 100-400 might be a reasonable solution on 24MP full frame, which will be less optically demanding than the R7's 32MP APS-C crop (which has a pixel density equivalent to about 80MP in full frame). The loss of a stop at the long end compared to the EF 100-400 keeps size and weight down. The need to use higher ISOs can be made up by the 24MP FF sensor's better high ISO performance than the 7DII. If shooting RAW, you can run the files through any number of modern noise reduction software options, such as Adobe's new Denoise. My experience with it on ISO 6400 and higher R6II files is that it will knock down noise to the equivalent of native low ISO images, and it also does some detail sharpening. It's impressive what you can squeeze out of sensors now with the help of modern noise reduction software.
I've only had brief experience with the RF 100-500, but was impressed by its optical quality at 500mm. It appears to be as sharp as my 200-400/4.
If weight is a major consideration, you might consider smaller sensor formats, such as Fuji's APS-C system, or the OM/Olympus micro 4/3 system. But not sure how those compare in respect to AF performance, lens options, etc.
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