Hmm - that's quite a plausible theory from an optics point of view,
would explain
why it could be sharp in the centre (where it never matters which way
around the elements
are mounted, except for coating differences and as long as the order
is maintained) and
go all screwy in the corners.
Usually element separation is plainly visible.
On the other hand, I wonder who would have the guts to take a 250/2.0
apart without him
knowing *exactly* what he was doing. Even our on-list genius John
seems scared to take
on this problem :-)
On 11 Nov 2009, at 3:52 PM, iwert bernakiewicz wrote:
> Hello John,
>
> I was just thinking, might it be possible that one of the elements is
> mounted the wrong way?
> If I look at the section only the fourth from the back could be
> reversed, if it is not symmetrical,
> the others seem one way only...
>
> Iwert
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