Originally Posted by
bglick
Sandy, when I read your lppm, I assumed it was a typo, and assumed lines per mm. I should have mentioned that. I hate the way these lpmm, lppmm, lp/mm is tossed around so loosely. Assuming the author truly meant line pairs per mm, then I would suggest his assessment is pretty high compared to most data i have read. What is the copyright of the book?
I can assure you, the eye can not resolve 20 lp/mm, even under the best of circumstances. Grab a test chart and try it, you can't fathom how tiny these targets are. Again, you can double the target size, and double the viewing distance to 20" to test yourself assuming you can't close focus.
Bookmarks