Originally posted by Alex645 In general, I've seen the decline end in 2010 and a slow increase in film usage and interest. I am surprised that no one is currently producing a SLR that is compatible with digital lenses.
The question as always is: which platform do you pick?
Pentax is the obvious answer for us here, given its legendary back-compatibility and to some degree forward compatibility too (e.g. the P series will handle DA lens apertures in program; the Super Program will do so in shutter priority as well), BUT the vast majority of Pentax DSLR lenses are APS-C and many (especially the zooms) do not play well with 35mm film in terms of image circle.
Nikon is perhaps the best contender, as its F mount has remained standard for a very long time and they have AFAIK always had a full-frame digital evolutionary path for a putative film camera to fall back on (I think your answer there might be "The Nikon F6").
The last generation of Canon film bodies will handle the current crop of Canon lenses, but (BY DESIGN) cannot mount the old manual glass.
I don't see Sony going back to film at all soon, but at least they have a good full-frame lens lineup. Try to build a Sony film camera and sooner or later the Name Which Must Not Be Spoken (Minolta) rears its ugly head.
Olympus got out of the full-frame game in the film era to adopt its own 4:3 standard, so again you have issues there with a changed aspect ratio.