On Feb 21, 7:49 pm, Wolfgang Weisselberg
wrote:
acl wrote:
On Feb 20, 11:38 pm, Wolfgang Weisselberg
Note: I am not saying Nikon lenses are bad, or that others do
much better. I am merely saying that they simply don't outresolve
the D200's sensor. And that many lenses do not even reach the
sensors resolution, especially when used wide open or looking at
the border performance.
That's true, but it depends on what you're measuring. I'm pretty sure
that any lens I've ever used can outresolve the d200 sensor if the
pattern has sufficient contrast,

MTF patterns have 100% contrast, black and white.

If you lower your standards enough, you may or may not get
there.

In fact all I am saying is that all the lenses I've ever used do get
there eventually (in the sense, for example, that you can force a d200
to produce aliasing artifacts with any lens I've used). I've just
tried photographing a slanted slide rule, and all 7 of my lenses can
be made to produce aliasing quite easily.

http://www.normankoren.com/Tutorials/mtf_100_0.gif
Look at how much you see at 10% and less.
Look how washed-out even 50% is compared to 100%.