I have 2 digital Camtrakkers that have taken literally THOUSANDS of photos, and I have never had any trouble with distortion or even scratches on the plastic lenses. I have a 4.1 Camtrakker with the strobe light flash, but though I haven't had any problems with distortion, the flash can sometimes "wash out" the pictures.

Here is a picture from a couple of nights ago that was taken with a 6.0 Camtrakker without the strobe light flash.