To do it the other way around, you'd need to get the Canon lens 1.46mm closer to the film plane. So how could you do that? You could mill 1.46mm off the lens (not possible)... Cotty
On very few lenses it is possible. I've been able to slightly grind (less than 1 mm) a pre-set (without any auto mechanism) Rokkor 100/4 and will glue a grinded Pentax screw reverse adapter on it, when I can go to the local cooperative metal shop after holiday. Because of lack of a collimater, I just get sure I am a little bit past infinity at the inf mark. Only set stop tele lenses can be adapted this way.
Andre
