The nikon is probably worth a bit, provided it is in working condition. If I am not wrong it should be a Nikon FE with a 50 1.8. The Canon EOS is useful if you wana try out film and already own a set of Canon EOF lenses. The zhu jiang is an interesting camera - probably an exata clone. the camera manufacturer used to make TLRs that rival the seagull. Will be interesting to see what pictures come out. The olympus is pretty much worthless.