First of all, I am new to this forum and I would like to thank you for accepting me here. I am a dental student and I would like to make a set of dental-surgical loupes. The loupes are actually small Galilean telescopes-microscopes with a fixed focus at 400-500mm, Field Of View of around 6" and a 2-3x zoom. I want your help to find the optics needed for this project (preferably achromats, aspheric, but I will make several experiments if needed). I promise I will post all the progress here with photos. I understand that this is a forum for discussing classical phusics but it is the one of the only forum I know where people with optical design experience and deep knowledge of optics come together. I would like to use high quality optics like edmund, zeiss or something similar. I need someone to help me with the ray traycing and the desirable lens configuration. I am currently thinking about a tessar configuration. Your ideas? Please help me. Thanks again, Constantine PS I already own a set but I want to experiment on making my own. I do this solely for experimental (and fun) reasons and not commercial.