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Sony 100-400 lens with 2.0x TC on a9 or a7R4.

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by Karl Egressy on Sat Jul 17, 2021 5:27 pm

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Hi,
I was wondering if anybody tried this combo and with what results.
F11.0 would be the threshold of getting diffraction if I understand it right.
What would happen to the focusing speed and accuracy.
Thanks.

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by E.J. Peiker on Sat Jul 17, 2021 5:32 pm

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It still focuses but of course slower - the latest iteration of the a9 or an a1 wouldn't lose much but the a7R4 would focus but likely not follow action that well. Diffraction at f/11 is there but not really heavily into the visible arena yet so i would not worry that much about it. I can't remember if you use C1... if so, just turn on the diffraction correction in the lens tab for apertures of f/11 or smaller (larger f numbers).

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by Karl Egressy on Sat Jul 17, 2021 8:49 pm

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Thanks, E. J.
I'll buy one if they allow me to return it if I don't like it for any reason. I want to use it with 100-400 lens and a9 II camera.
Renting one is complicated as I would have to go to Toronto twice and I hate to drive on HW 401.
Most polluted HW that is.

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by Scott Fairbairn on Sun Jul 18, 2021 7:29 am

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It works surprisingly well on the A9 Karl.

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by dpirazzi on Mon Jul 19, 2021 4:52 pm

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In my testing, the 2x, 100-400, A7R4 combo worked amazingly well, albeit with slower focus. But comparing prints of the same subject taken using the 2x, vs. 1.4x with upressing to match the 2x size/resolution, I could see no image quality benefit at all to using the 2x. Perhaps the story is diffrerent on the A9.

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by Karl Egressy on Thu Jul 22, 2021 5:33 am

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Thank you all. There was no opportunity to rent and test one, it is a special order, I won't even have the right to return it if I don't like it. I used to have a 2.0x
Canon extender, the latest version and it was absolutely useless and unused until I switched to Canon 5D Mark IV. It worked fine on that camera.
I hope it'll work reasonably well on a9 II.

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by E.J. Peiker on Thu Jul 22, 2021 12:27 pm

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a9 II should work pretty well with the caveat that you are working with an f/11 optic to start with...

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