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This is how I take sharp photos on my Rebel (Canon 200D) with 50mm 1.8 STM lens: Try to keep the shutter speed high (beyond 1/125) at the cost of ISO. Set camera to a single point AF that is closest to eyes of your subject in the composition. Always use Optical viewfinder, compose & click your shot. LCD viewfinder is less reliable for this lens, more ...


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Use a macro focusing rail (or similar) to reposition/focus the camera while in live view, after focusing using PDAF, and directly measure the physical offset (you may have to disable AF in liveview mode). Note that focus throw (ring/gear rotation) varies between lenses, as does drive gear types/angles/etc... and as a minimum you would need tooth angle(s) + ...


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Both the EF 85mm f/1.2L and the EF 85mm f/1.2L II use a 'focus-by-wire' system for manual focus. That is, there is not a direct mechanical connection between the focusing ring and the lens' focus elements. When you turn the focus ring the lens sends an electrical signal to the camera, which in turn sends a signal the the lens' focusing motor to move the lens'...


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