Archived posting to the Leica Users Group, 2001/07/24
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Austin Franklin writes: > 2700DPI only approaches the limit of quite > grainy films. 2700 dpi is 53 lp/mm. It is very difficult to achieve 53 lp/mm with handheld photographs because of camera shake (and most of my photos are handheld). Additionally, most lenses--even most Leica lenses--show rapidly deteriorating modulation transfer beyond 40 lp/mm, and most films are not much better, declining rapidly around 50 lp/mm. If you disagree, a quick look at the actual MTF charts for lenses and film will reveal that 53 lp/mm is plenty for most photographs with most lenses (Leica or otherwise) on most films. > 4000DPI approaches the grain of 160ASA > film, and 5080 of 100ASA... Under ideal conditions, perhaps. But in practice, one rarely gets that far. I've scanned thousands of photos, too. In 99% of them, it is very clear that the resolution in the photo is not anywhere near the 35 lp/mm limit of the scanner. In fact, it is surprising to see a photo so clear that every pixel is being fully utilized at 2700 dpi. With a tripod, the limits are more likely to be reached (with a good lens and fine film), but I almost never shoot anything on a tripod.