A lens that is good for photographic purposes is often not good for scanning purposes. This is because while photographic lenses are made to focus on 3D objects at distances from about 50cm, we are trying to focus on a 2D object at much closer distances. Most photographic lenses will not even focus close enough to fill the digital frame with the film and you would have to crop. Even if it does, or you use extension tubes, this is not enough. An optimal lens for scanning projects a flat focus field, has high resolution at close focus distances and has high contrast. These are complex concepts, but by looking through the price ranges that you are interested in, you should get a good overview of what will work for you.
A lens that is good for photographic purposes is often not good for scanning purposes. This is because while photographic lenses are made to...
