100 vs 125

Let me make another suggestin. !00 to 125 iso is a cifference of 1/4 stop. Does not sound like much, but its a full quarter of a stop and depending upon what type of image you are making ,it could be a great deal. I would suggest that you do open up that 1/4 top . But first ,as suggested , have the shutter speed checked at a repair shop.

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