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It will downgrade your F4 aperture by two stops. That is to f/8 ( First stop F/5.6, second F/8). It will downgrade sharpness slightly. You will get x2 focal length
It will downgrade your F4 aperture by two stops. That is to f/8 ( First stop F/5.6, second F/8). It will downgrade sharpness slightly. You will get x2 focal length
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