The reason it doesn't work is that older lenses don't have the CPU contacts that the AF lenses have to communicate with the camera. You just have to set it manually. Oh yeah, it won't meter, so you may have to invest in a handheld meter. Have at it and have fun taking pics! :)
My Nikon D70s also did not recognize my Nikon 500 mm Reflex (Mirror) lens and this with the same brand, but working in manual mode was fine.
I ones also had a slide zoom but gave it away, cause its much harder to focus AND zoom at the same time (movement of the hand)
Kind of hard for me to understand all what you said, bacause of the echo effect in the bathroom