I cranked up Excel for a few minutes and derived the following table. It
assumes a few things, like a resolution for Velvia of 120 lpm, and a lens
resolution of 600 lpm @ f/2.8.
Lens aperture System Resolution Assumed Lens Resloution
f/2.8 80 lpm
600 lpm
f/4 90 lpm
400 lpm
f/5.6 95 lpm
300 lpm
f/8 100 lpm
200 lpm
f/11 95 lpm
150 lpm
f/16 80 lpm
100 lpm
f/22 70 lpm
75 lpm
As you can see, around 2-3 stops from wide open is the "sweet spot" for
overall resolution.
John P
______________________________________
Mark Hammons <astair@xxxxxxxxxxxxx> writes:
.....a big snip here......
>What this means is -- as per my original post is that typicall 35mm optics
>COULD theoretically be much, much better in resolution. I believe that
>one of the sharpest Zuikos is the 50mm F1.8, which if I recall is about
>90 lp/mm at F5.6, or something ( too lazy to go look it up). This is
certainly
>very good with respect with other lenses but it could theoretically be up
>toward 220 lp/mm if it were diffraction limited. But then, we would again
>need to have film up around that area too to make use of this resolution.
>By the way, do we have published figures on the resolutions of various
>films?
......and a big snip there.......
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|