A7R3: Canon 100-400 L IS II on MC-11 - poor performance

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stormgirl_lp
stormgirl_lp Junior Member • Posts: 31
A7R3: Canon 100-400 L IS II on MC-11 - poor performance

The AF focuses well at 100mm, but begins hunting once the barrel is extended by any amount.  Even in plenty of light.

To be fair, on my Canon 40D body, this lens would hunt most days.  On the MC-11/A7R3 combo, the lense is nearly useless when extended at all.

Does anyone else have experience with the combo?  How are do 3rd party e-mount lenses compare on sharpness and AF performance compared to $$$$ native lenses?  On Canon, Sigma had some solid primes, but I always found their zooms to be soft and somewhat slow.  I avoided Tamron entirely.  In all honesty though, I last shopped for lenses on my 40D in 2017.

 stormgirl_lp's gear list:stormgirl_lp's gear list
Canon EOS 40D Sony a7R III Canon EF-S 18-200mm f/3.5-5.6 IS Canon EF 100-400mm f/4.5-5.6L IS USM Canon EF 50mm f/2.5 Macro +1 more
Canon EOS 40D
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