Archived posting to the Leica Users Group, 2000/10/30
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Erwin, I don't know if you're aware of this, but you will never just 'line up' your digital sensors pixels with your target. Say you are shooting 1:1, and you are trying to record a line that is .001". You would need to sample at at least twice that frequency, or .0005" to pick that up, since it could fall exactly between two sensors, and not get picked up by either one. So, when you calculate the resolution you need for a digital sensor to record information, don't forget to multiply by (at least) 2x the target size you want to resolve to. I also believe line pairs, are exactly that, line pairs. So, 40lp/mm would be 80lines/mm or 2032 lines/inch but in order to pick them up, multiply by 2, and you get 4064.... Imagine that ;-)