James writes: > Scanning the 4x5 at 5000 ppi changes the relative equations quite a > bit. However the limitations of the large format lens / negative > combo still limit the image resolution to about 40 lpi and with great > lenses, perhaps 60 lpi. The 5000 ppi scan will then be recording the > grain structure but you won't be getting additional image sharpness > because of it. not to point out the obvious, but nyquist limits and resolving power work against digital too ;) there may be 6,12 or 24 Mp on the sensor, but the resolving power (resolution of sorts) is also less than the Mp count 4x5 worth of area covered at 40 -60 lpi resolution is a lot of data! karl
