Hi there. I found a very cheap 300mm lens for Nikon in good shape. The lens is a Telesor Auto 300mm F:4 for F-mount. Does anybody know this lens? How good is it? I am looking for a replacement for my 70-300 that I think it's a little crappy at 300mm. Do you think that this Telesor prime would have a better performance than this Nikon zoom? I know that the ideal choice would be the AFS 300mm F:4 but right now I don't plan to invest in such a lens. If someone knows something about Telesor lenses and this prime in particular I would be happy to hear.