My experience with the 75-150 was always good, I had three and still keep
one, it is a bit lower in contrast but resolution is very good. This was
recently confirmed again with the 10D. The 75-150 will be the lens that
always go with my 10D, especially the D-range of 10D is not that great, a
lower contrast lens will help to give more room for post processing.
The example of a lens with triangle aperture is just too extreme (I know the
85/1.4 Rollie has this specail blade construction) it lead to people think
that the a lens with good bokeh must have round aperture. This one with XA
square aperture at F5.6, is it very poor? Yes, the bright spots look square
but overall is quite pleasing.
http://www.accura.com.hk/XA-05.jpg
C.H.Ling
----- Original Message -----
From: "Joel Wilcox" <jowilcox@xxxxxxxxxxxxxxxxxxx>
>
> I noted this somewhat in C.H.'s photos too. The 75-150 seemed to have
> marginally the lowest contrast of all his photos with the D60. The lens
> has a reputation for being the least sharp and least contrasty at the long
> end.
>
> I thought C.H.'s example acquitted itself very well though. Absolutely
> nothing shabby about it.
>
> There must be huge sample variation with this lens, not the least because
> of its sheer age. My example I had always thought was pretty good. I had
> a little repair done to loosen up focusing and we discovered it had fungus
> on one element (I hope from a previous life -- I picked it up in a pawn
> shop). It is much sharper now! There are supposedly lots of examples of
> the older 75-150's with element separation. That will spoil contrast too!
>
> The key article on bokeh that was referenced recently shows an example
with
> triangles. I interpreted that to mean that you can get some really weird
> artifacts from unusual diaphragms, not that the diaphragm itself is the
> sole cause of good or bad bokeh. Or at least that's what I'm saying now
> that C.H. has sort of demonstrated that the blur characteristics must be
> more due to the lens formulation than a raw count of aperture blades. :^)
>
> Joel W.
>
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