Neil Ellwood wrote:
On Thu, 21 Mar 2013 13:48:01 +0100, Wolfgang Weisselberg wrote:
Neil Ellwood wrote:
On Sun, 17 Mar 2013 14:45:31 +0100, Wolfgang Weisselberg wrote:
RichA wrote:

But has anyone on a D800 seen an excellent lens beat a good lens when
it comes to resolution, in the centre, at f/8.0?

Has anyone seen an f/1.4 lens beat an f/4 lens at f/2?

That's an old chestnut - they all would.

The even older chestnut is that f/8 in the centre is where even less
than stellar lenses are usually very good.

Oh, and that many people don't want to use only f/8 and the centre on a
D800.

(How do you stop UP an f4 lens?)

I don't know what you'd do it, *I*'d use a focal reducer.

With the only focal reducer I've seen it would still have been an f4.

Then it isn't a focal reducer. A focal reducer is just the
opposite of a teleconverter/extender: reduces the image circle,
reduces the focal length, increases the light per area where
the image circle is.

-Wolfgang