on 7/2/04 9:47 PM, Patrick Baldwin wrote:
> 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. > Sorry I couldn't be more helpful but at least you know it isn't you or > the lens. > Patrick. Hi Patrick >From what I've been told the cause is light reflected off the chip (the chip having a more shiny surface than film), if the rear element of the lens is further from the chip (like the macro) then the problem is more likely to appear. There must be some exact science to this but I'm not up on this on enough to give any type of formula. Regards Darrin Jenkins =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
