04-07-2015, 06:41 PM
How "easy" is it to get the camera aligned to the test chart?
Just thinking out loud here so feel free to shoot down... how about if you configure to maximise the MTF for two opposite corners at the same time, and without changing anything measure the centre. Then only changing the focus, maximise the centre resolution. Would the ratio of the two centre measurements be a useful indicator of the difference in focus from centre to corner? My mind hurts thinking how any other defects might impact this...
Just thinking out loud here so feel free to shoot down... how about if you configure to maximise the MTF for two opposite corners at the same time, and without changing anything measure the centre. Then only changing the focus, maximise the centre resolution. Would the ratio of the two centre measurements be a useful indicator of the difference in focus from centre to corner? My mind hurts thinking how any other defects might impact this...
<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.