.. > > If you haven't yet, check out Edmund Scientific. They may have what you > need. > It was one of the first places I checked. Unfortunately they do not seem to have the strengths (focal lengths) I am looking for, which are in the range of 4000mm (+0.25) to 1333mm (+0.75). Admittedly, these are ranges most often associated with eyeglass corrections, but I hope that they are not that hard to come by. Nathan Prichard
