[Dabhand16]

Dave is right here. I'm not sure if your average mini lab will be able to do this, but 'proper' labs will. Basically, I think that if you have used a higher speed film than the setting on the camera, that is overexposed, they will reduce the development time, and vice versa.

When I used to develop films, you could 'push' low speed film to perform at higher film speeds, but it usually increased contrast and reduced lattitude. when pushed a lot, you used to get very grainy results that sometimes looked really good, depending on the subject.

The old adage of minus one third of a stop for transparencies and plus one stop for print film might be applicable. In this case, it would be better to use the 100 asa setting on the camera.