> > While we're at it, how about some circuitry to convert > the manual aperture position to an electronic signal, > and all M and K lenses can be made fully compatible!
You'd need more than that - you'd also need something to stop a K/M lens down to the right aperture; the actuating lever on the body only moves to the 'A' lens position, which isn't far enough to fully stop down a K/M lens. And, of course, you would only want to increase the travel for a K or M lens; for an A or later lens you'd want to use exactly the travel that the body supplies. (In other words: it isn't going to happen) Good news on the optical front, though; I'm fairly sure the earlier poster who caclulated image distances, etc., got it wrong. A simple concave lens acts as a reverse teleconverter (image magnification factor less than one), but increases the primary-lens-to-image distance. Theres no image inversion, and there's room for the converter. So the optical side, at least, is possible.
