Thanks John, that's perfect... to quote Reinhold... "The location of slot for the stops is 10~15% of the focal length in front of the lens"

Heavens, this camera is going to be enormous, it'll need wheels!

Quote Originally Posted by jnanian View Post
hey david

have you seen these threads ?
they might help you with your lens design ...
or you might scrap them altogether and buy one of reinhold's lenses !

have fun with your experiments !