Recently I have had vignetting problem with my Sigma 18-200mm f/3.5-6.3 DC OS HSM (72mm)
After checking, it is specified in the manual that one should not use multiple filters or thick filter (as polarizing filter) on the lens because it might create vignetting.
I have indeed used very often a polarizing filter and UV filter, some time together.
Is it common for lenses to be sensitive to the number of filter attached? or is this only this model which has a weak spot?