I have a lens with a small but significant looking scratch near the center. But I don't see any difference in the photos. Where does the imperfection show up? How important is it to get the piece of glass replaced? (It's a Panasonic 14-45mm micro 4/3 lens).
Answer
Most of the time, the scratch will show up as a small and perhaps even unnoticeable amount of softening in the image. (It will largely be "outvoted" by the vast majority of the light, which is being focused properly.) In high contrast situations, though, or when the light is striking the lens directly, there may be a significant mount of flare washing out the image and reducing overall contrast.
The scratch will probably also make the lens element more fragile, so it will likely to be easier to crack that lens element if the lens is dropped or given a good bump -- that depends on the type of glass.
Fixing it isn't a critical emergency unless it interferes with the kinds of pictures you want to take, but if you plan to keep the lens for a long time, it would be a good idea to get it repaired at some point.
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