On 7 Feb 2004, at 16:53, i4images wrote:
Dear list,Hi Ian. I've had exactly the same problem with the same lens...but I've also had it on a Nikon 85mm 1.8 and a Tokina 28-70mm 2.8. The only consistent thing was a white background. I only get it then but it is a huge pain. Changing distance and lens can get rid of it but that's not always possible I know. I'm still trying to solve it permanently. I know it's nothing to do with Sigma lenses or filters though.
Have been using my sigma 105 macro ex lens for some studio work on my
d100. I am getting a rectangular mild blue shape appearing in the middle
of the shots, which is in the same place when portrait or landscape. I
have never noticed this before. I am thinking it must be a reflection of
the chip on the back element.
Sorry I couldn't be more helpful but at least you know it isn't you or the lens.
Patrick.
http://www.patrickbaldwin.com
020 8891 2516
07802 408 638
A member of The Association of Photographers
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