stan the man
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puddleduck said:I'm pretty sure that won't fit.
You could probably use a Kenko, or better still a Sigma TC.
I tested a Sigma 100-300 f/4 against your old Sony 70-400 and at 300mm the Sony absolutely smoked the Sigma
Sigma 100-300mm:
Sony 70-400 SSM:
So too be honest I don't think you'll like the Sigma if you are used to the 70-400 SSM. I've tested a number of lenses inc. Sony 70-300 SSM, Sigma 100-300 and Sigma 50-500mm and your old Sony 70-400 SSM smokes 'em all
Cheers andy.I was counting on the Sony TC being compatible with the sigma to even consider it,and S it doesn't,I probably won't bother and just use my 70-200G with the TC and crop when needed.