Is there a filter on the lens? if there is it could be bouncing off that, if not its internal reflection. You all know my feelings about Sigma so I say no more!

Calvers

On Saturday, Feb 7, 2004, at 17:58 Europe/London, Rob Wilkinson wrote:


i4images wrote:
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,

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