Bessa RF calibration: off at infinity, ok at film plane
I just got my R3a back from our host and head bartender for a RF touchup this weekend. Picked up a brick of HP5 and went out shooting: my RFs have been out of commission for a couple years (just didn't have the time to send everything in), and it's good to be back shooting.
I was out photographing some of our forests of cranes here in Seattle and noticed the focus patch was coming up short at infinity. At first I was a bit alarmed, since the two lenses I was working with had been collimated relatively recently, and one had a year-and-a-half turnaround time with DAG. My first assumption was that they'd come out of alignment again.
Got home, swapped out for my CV lenses and went up on the roof: same deal. Thoughts turned to the RF coming out of adjustment just days after getting back. I don't baby my camera, but it does live in a case, and Stephen packed it well.
After finishing off the roll, I tried to get a better look at the film plane through a ground glass swiped off my Nikon and a jewelers loupe. Set up the camera on a tripod about 4' from a computer screen with some large type displayed in a word processor.
As far as my admittedly poor eyes can tell, the RF is coincident with the image on the film plane at close distances with all my lenses, from a 25/4 to a 90/2.8. Which is good, since that's where critical focus happens. But at infinity, things still don't line up and Im out of focus lever travel—but it still looks okay on the ground glass. Haven't developed/scanned the test roll yet.
Unsure what to do here: to put up with it and stop with my slight compulsive tendencies (I've been up doing this testing for 4 hours now), or is this actually an issue to pursue?