Originally posted by Imageman A canon 5D mk1 200 dollars
An m42 adapter 10 dollars
5 m42 primes 200 dollars (35mm 50mm 135mm 200mm 300mm)
Total cost of going FF 410 dollars (cheap starter system)
comments please
Feasible, with some potential issues.
35mm - mirror clearance problem (my 35/3.5 did not clear)
50mm - the 8 element version is documented as not clearing the mirror. My modified A50/1.7 was no issue. An already modified (by previous owner) K50/1.2, barely cleared. Some varying results out there concerning the 7-element Takumar 50mm on the 5D
135mm - no issue
200-300mm - should be no issues. They usually don't stand up to the resolution/CA resistance for more pixel dense sensors though, but the 5D is only 12mp on FF (about equal to the density of a 5mp aps-c) so its very forgiving.
That said, a PITA to use.
You would also need a EEG precision focusing screen (~$45) to get good focus accuracy with fast lenses.
The stock 5D screen is no good at all (maybe for f4 o5 f5.6 lenses only )