28 May
2013
28 May
'13
10:37 a.m.
Seems like a suboptimal tool for the job, especially when the right answer is so easy: make another exposure in the exact same setup with the chart replaced by a uniform white reference
Agreed, granted that you manage to achieve exactly the same shape of bending for both sheets, or if you manage to mount both ones perfectly flat. The advantage of using target patches for the purpose would be on the other hand that they come from the _same_ sheet, ruling out bending differences. Best regards, Gerhard