Rob,
I would say this is either on the rear element, or on the diaphrgm. It
may be the diaphagm, but you do not see it because it moves when you
open it all the way up to do your examination. But optically, I think it
has to be the rear element, and you are just missing it somehow.
John
"R. Jackson" wrote:
>
> http://www.conventicle.com/reyes01r.jpg
>
> Anyone want to hazard a guess what's causing that mark in the top
> center of this photo? That was shot using a Sigma 28mm F3.5 Macro lens
> I picked up at auction last summer. I took it down to Point Reyes a
> couple of weeks ago and everything I shot has that mark in the frame. I
> can't see anything when I visually inspect the lens, but it's there in
> every photo I used it to shoot and none that I didn't, so it's
> undoubtedly the lens. I got the lens cheap, so it's not so much an
> issue of the money lost as it is buying something described as
> near-mint and ending up with this.
>
> -Rob
>
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