On 5 Jan 2001, at 22:34, Jim & Jackie Meeks wrote:
> I was looking at Yoshihiko's lens ratings site and was noticing how low a lines
> per mm rating the 77 and other telephoto lenses fared, especially when compared
> to some of the wide and normal lenses. I've heard several people on the PDML
> rave how sharp some of these lenses are and it would seem to follow that they
> would have a higher resolving power. Would anyone care to explain? Thanks. Jim
> Meeks
Hi Jim,
Sharpness is not an absolute measure but a perception, ie if the image from
a lens displays a very smooth and uniform out of focus area then the
apparent sharpness of the in focus area may be greater than an image from
a lens which has a measurably higher resolution but causes distraction and
confusion in image background. So resolving power isn't directly related to
resolving power but more so to the overall optical thumb-print (combination of
all the commonly measured and non-measured optical parameters) of the
lens.
Written in haste :-)
Cheers,
Rob Studdert
HURSTVILLE AUSTRALIA
Tel +61-2-9554-4110
Fax +61-2-9554-9259
UTC(GMT) +10 Hours
[EMAIL PROTECTED]
http://www.ozemail.com.au/~distudio/publications.html
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