I got an F (69XXXXX serial number) with an FTn finder recently and have a few questions. I've put a few rolls through it already, and it seems to work reasonably well, but I'm curious about a few things:
1) Should the needle be perfectly centered when doing a battery check? How far off should it be when using alkaline batteries? Mine came with PX625A cells, and when I do a battery check, the needle is currently either right on the left side of the O, or just a hair inside; I'm not sure how drained they may be. Actually, at the moment, it is almost perfectly centered in the O. Is that typical? I'm trying to figure out if perhaps the meter has been adjusted to use 1.5V batteries.
2) Assuming it hasn't been adjusted to use 1.5V batteries, recommendations on solutions? The options I've seen have been the Wein MRB625 zinc air cells and adapters for silver oxide cells, including the CRISCAM MR-9 adapter. Thoughts? How long do the Wein cells last once opened? Presumably silver oxide cells with adapters last...a long time?
3) I've noticed some odd behavior if I haven't used the meter for a while: the batter check barely registers and the meter clearly isn't responding properly. I'm not 100% sure on the "fix", but it seems that if I turn the meter on and point the camera at a relatively bright source things start working fine after maybe 10 seconds. Has anyone run into this? At this point it's just a minor annoyance, thankfully.
I'm leaning towards getting the battery adapters, but I don't want to pop them in only to find out somebody recalibrated it for alkaline cells. The exposures I've been getting seem pretty good, or at least in the working range of Ilford HP5.
As an aside, this has been my first foray into film since I got my D200 in 2006, and the first time I've had an all manual camera (started on an EM, moved to an N70, and also used an FG a bit). Here's one photo from the first roll I shot: