there are two (basically) rangefinder options on the speed - the side-mounted kalart or the top-mounted model that takes cams. The side-mounted is generally preferred for coupling to specific lenses, as the cams are limited to certain lenses and can be hard to find (so buy a camera and lens kit already together, don't try to piece together a kit). Oh, and while it takes these cams, they are hard to get out and install, hence not really being appropriate for multiple lenses, even though
technically you can.
The kalart can be coupled...but it's a very difficult and time-consuming process. I've done it about a dozen times and it really is a pita, and i've found that some kalarts just don't work right with some lenses. A couple of times, i simply replaced the entire kalart mechanism and suddenly it coupled just fine...so it's kind of a crap-shoot. Again, finding a camera/lens setup already is great, but of course you'll pay for the privilege.
Ps: Look in
this thread for some speed graphic "street" images posted recently by one of our members.
Personally i've shot some candid images on the street with these and the polaroid was definitely the winner as long as the fixed 135mm was the focal length i wanted to use exclusively (you can get them made for a variety of lenses from 90mm up to 150 or maybe 180mm). The linhof though was more precise and i was able to more accurately focus, but drift is a serious issue, when moving the eye from the rf to the vf. If you are shooting moving subjects, stopping down will be your friend...personally i like short dof which is a real challenge...
Here's something i shot years ago with my linhof and 150mm f/2.8 xenotar, at about f/4 i think, on e100vs:
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