I'm aware that some lens designs can be used with elements or groups removed to give longer focal lengths, with a corresponding change in aperture.
Convertible lenses are obviously designed to do this, my question is:
What other type (design) of lenses are particularly suited to this, and what is folks experience (and hopefully success) in doing this?
I've got a broad photographic interest, things don't always have to be razor sharp and I'm not adverse to softer focus, paper negs and thus longer 'top hat' exposure times with barrel lenses etc.
Focal lengths of say 18" / 450mm up - anything to not attach my barrel 480mm Apo-Ronar to the Canham
(The obvious answer is 'try it and see' but it would be great to learn from others experience first).
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