I did a lot of tests with my rigs to see what the limits were. The only way to tell for sure is to do some tests. If you could borrow the tripod you are thinking of buying or similar, that would be great. Ditto for the head.
Barry Thornton in "Edge of Darkness" shows how to figure out camera vibration on a tripod: In a dark room or at night in a very dark place, set up a small LED light so that is the only light source around. Take several photos of it with your rig from about 1/60 (as a control) down to 1 sec or so. The negatives should come out with just a tiny speck of a light. Use a loupe and see if there are differences at different speeds. If all is well, you should not see any differences.
I did this using different lenses, with and without Mirror Lock Up (irrelevant for rangefinders) and it was quite instructive. What I found out:
- MLU helps
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Adding weight to the tripod helps much more than MLU
- Heavier tripods are better, but adding weight to a light tripod can be just as good (provided its of decent quality to begin with)
- Adding a bag of sand or some weight to the camera helps.
- Holding your hand on the camera, contrary to what some say, made things worse
That's what I learned, but you should do the tests yourself and then decide.
YMMV. I did the same experiment with my monopod to see exactly how many stops I could get there.
I've summarized all my findings here:
http://home.comcast.net/~kurt.thompson/
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http://home.comcast.net/~kurt.thompson/MLUTest.html)
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http://home.comcast.net/~kurt.thompson/Monopod.html)