Peter, Thanks for your input!
It's been a bit foggy here so I had to wait for it to clear before checking infinity
I tested with both the rangefinder patch and live view. I focused on a tree about 2200 feet away (I measured it on google maps). The rangefinder and live view both agreed that the tree was in focus.
There also happened to be a roof line about 100 feet away. Here is where they were different. Live view showed the roof line in focus, but the rangefinder patch did not. The ghost view on the rangefinder was slightly to the left.
I took 2 test shots, one at f2.5 and one at f/8. In the resulting images the distant tree was in focus in both. The roofline was in focus in the f/8 image, but slightly out of focus at f/2.5.
I checked a DOF calculator and 35mm f/2.5 2200 ft focus distance should have a close limit of about 52 ft for “acceptible sharpness”. So I would have expected the roofline at 100 ft to be in focus in both images.
Given this additional info, could one reasonably conclude if the lens or the rangefinder calibration is the issue?