Travis Butler
Well-Known Member
And even that just measures resolution; a lens can have high resolution and not appear sharp because the tonal rendering doesn't highlight the edges. Using something like the Clarity tool or the Dynamic Contrast filter can make an image appear much sharper without changing the actual resolution.There’s a way to measure sharpness objectively on an optical bench - it’s called the MTF and acuity values are measured in line pairs per millimetre. Not sure how big a standard tack is, but if we really want to be objective in measuring lens performance, we need an optical bench and a machine to measure the MTF.