I am a rookie in medium format and I just bought a Mamiya 7 II body (I'm looking for a lens to buy). I got it to a technician to check it with lens and he told me that the telemeter is only vertically slightly over. He told me isn't a serious problem and this happens regularly as the telemeter is very sensitive. However, the adjustment of the telemeter costs 40 euros.
The owner told me that hadn't realized of it and never had a problem.
Do you think that it is worthy to pay for the slight adjustment or as this doesn't affect the photography to let it be as is?
I"d wait until you get a lens attached to it and shoot a roll of film. Shoot subjects at varying distances, at larger apertures, to check the accuracy of the rangefinder and lens as a unit. Frequently if adjustment is needed, both the camera's rangefinder and the rollers on the lens need adjustment.
Depends on you. A little vertical mis-alignment won't hurt anything. Once you see it, it may bother you just from knowing it's there. Kind of like a small pebble in your shoe.
Myself, I'd fix it but I'm obsessive.
I'd search on google and find the info to fix it myself and see if I thought I could perform the fix. But you do need a lens to do any fix so you might as well wait until you have a lens and give the camera a try.
Very simple to do....after the lens is attached of course....my M7 II was slightly out of alignment but enough to be a focus issue.....an easy repair for you and well worth it as I tend to think the Mamiya RF 6/7 lenses are about as good as you can get..(at infinity you will see just how out the focus mechanism is)
this info/allows allows for perfect adjustment .... http://tomwestbrook.com/Photography/rangefinder_adj.html
I have adjusted the rangefinder on a couple of Mamiya 6 bodies. I'm not sure but the Mamiya 7 is likely to be similar. There are instructions on the web in various places. But you do need to be very careful. I agree that you should firstly try out the camera with a lens.
If the two images don't fully coincide (one above the other) it doesn't stop you getting accurate focus but it is a bit more difficult to judge the exact spot.