More specifically, the 5D.
Now, I'm wondering if there are any interesting old large aperture manual focus primes out there that'd work decently on a 5D (read: ones that only require mount adapters with no glass in the adapter itself).
I am already aware of the various Zeiss lenses out there, I'm asking about lenses for other makers, preferrably things that are quite cheap but really damn good(yes, I'm aware of the fact that the meanings of both of those words are relative, and also quite vague, but at the moment that's what I'm going for - the prices vary enough that I'm not going to put on a definitive pricetag just yet).
I own an M42 mount Helios 44-2 58mm F2 and an M39 mount Mir-1 37mm F2.8(both old russian lenses, the first one is basically a Zeiss Biotar but with a "made in the USSR" badge slapped on it, and with slightly inferior build/optics due to more lax factory tolerances which inevitably accompany anything and everything made in the USSR, and at the moment I can't really remember what the second one is based on), but as far as I know they both have the problem of being too close to the sensor, that the mirror would go against 'em and break, so I haven't really used 'em on my 5D, nor have I bought adapters for 'em. If anyone could please enlighten me on these two lenses as well, I'd be thoroughly grateful.
Edit: Yep, did a bit of research and discovered that both the mirror would hit both the Helios 44-2 and the Mir-1. Too bad...
But the main focus is on old MF lenses I haven't heard of, but would be pretty awesome on this particular camera body. Particularly interested in lenses that are between 28mm and 40mm, and also interested in short telephoto primes with relatively large apertures, but please, don't limit the recommendations to just those focal lengths.
Softness really isn't that big of an issue - the 5Dc's sensor isn't that demanding, and I'm really not a pixel peeper... besides most primes are more than sharp enough anyway, esp. when stopped down.
Particularly interested in lenses with somewhat unusual optical characteristics, i.e unusual bokeh, et cetera. Or really anything somewhat unusual and interesting about the lens, optically speaking.
The short telephoto lens would mainly get use as a sort of a portrait lens, while the shorter one that falls between 28mm and 40mm would be more for street shots and the likes, and also upclose portraits with slightly unusual...er perspectives. Though really I'm not basing actual demands on the lenses just yet, more of an experimental thing, provided I do find something interesting enough to spend money on.