One of the common things that needs correction with rangefinder cameras is the alignment of the image.
Most of the coupled ranged finder cameras that I have had user accessible adjustment screws or ports. It appears that these tend to be fairly similar in how the adjustments are made (as you will see below when I become repetitive).
Tools: screw drivers, pointy tweezers, and flexi-clamp.
Most of the adjustment screws require a very thin slotted screwdriver.
Attach a lens.
Set lens to infinity.
Locate a subject that is very very far away.
Make the adjustments. Most of the instructions that I have read usually state to adjust the horizontal first, then the vertical.
Then, if you have one, attach another lens and check again.
Canon 7 (and I believe the 7s and 7sZ)
The screw left of the viewfinder port covers the horizontal alignment screw.
For the vertical adjustment, access it through the small port on the top beside the shutter release button. You will need pointy tweezers to turn it off via the two pin holes. Underneath is the adjustment screw.
Canon P
The screw left of the viewfinder port covers the horizontal alignment screw.
Unscrewing the collar, using the flexiclamp, around the rangefinder port will reveal the notched ring that you turn for vertical alignment.
Canon IIF
The screw beside the viewfinder port covers the horizontal alignment screw.
Unscrewing the collar around the rangefinder port will reveal the notched ring that you turn for vertical alignment.
Leica IIF
Yup … you guessed it …
The screw right of the viewfinder port covers the horizontal alignment screw.
Unscrewing the collar around the rangefinder port on the left (the right one is the viewfinder) will reveal the notched ring that you turn for vertical alignment.
Minolta-35 model II ver.A and B … and probably other earlier models
The screw beside the viewfinder port covers the horizontal alignment screw.
Unscrewing the collar around the rangefinder port will reveal the notched ring that you turn for vertical alignment.
Yeah, there is a common theme going on here … but you will encounter some cameras that will require removal of the top cover to access the adjustment screws.