Quote Originally Posted by dynachrome View Post
The reasons I think the f/9 lens may not be practical is that it will need extension, it has no auto diaphragm and it will be difficult to focus even if it is used wide open.
If you haven't tried it, don't knock it. I've tried it and that's why I recommended it.

Re extension, read what I wrote. Bellows with adapters as needed.

Re auto diaphragm, so what? I shoot from tripod, my subjects don't go anywhere, so manual stop down is practical.

Re focusing, the usual SLR screens with microprisms or "split image" whatsit are useless with slow lenses. I use a plain ground glass. Focusing is not a problem.

Fantasy, sorry, theory, is often a poor guide.