On Sun, 29 Jul 2001 15:03:22 EDT (BeckettJB@aol.com) wrote:
> any lpi you get in the
> final scan? (I noted in a Pop Photo review the IV ED's "optical
> resolution" was 53.3 lpi while the nikon 4000 was 60 lpi, so despite
> having roughly 75% of the 4000's stated dpi it achieved roughly 90% of
> its optical resoving power...hmmmm, is this a meaningful test?)
No, optical resolution is a different parameter to pixel resolution
(density) - although insufficient pixels are a brick-wall limit to optical
res, and a rotten lens will give a blurry image full stop.
I find those test figures hard to believe, or rather I doubt they
accurately reflect relative sharpness on real images. Other factors (film
grain) have an unpredictable effect on scans, I'd expect the scanner with
the lower pixel density to suffer most.
Suprisingly perhaps, some softness is desirable in filmscanner and digicam
lenses, as it can mitigate aliasing artifacts.
Regards
Tony Sleep
- Online portfolio & exhibit; + film scanner info
& comparisons
