Pentax 6x7 TTL meter adjustment

[shawn]

My Pentax 6x7 TTL meter overexposes consistently by about 2 stops in bright and low light. Using:

Pentax 6x7 TTL Metered Prism Service Manual

Factory service manual

learncamerarepair.com

and

Pentax 6x7 TTL Prism Repair and Exposure Meter Adjustment

The TTL Prism on my Pentax 6x7 camera has a built in exposure meter that was starting to go a bit whacky. The needle would jump all over a...

web.archive.org

I though I'd be able to adjust this with one pot. Upon opening my meter I have a much newer version of the electronics.



I haven't touched the pots on this. Anyone know which one is for an overall offset? I don't need to calibrate the high or low, just change the overall scale.

Thanks!

 

[x-ray]

I think I’d simply adjust my ISO and not mess with the pots. I thought I could adjust a meter once and found if you adjust one pot it affects. Highlight and shadows too. It turned into a nightmare juggling between three adjustments and I never got it perfect. I’d been better leaving it alone.

 

[shawn]

If I can I'd like to fix it for real so that I could meter with 3200 film. Adjusting the ISO does work for now and how I shot my first roll.

The earlier version of this meter has one pot that shifts the entire range which would fix this. I'm assuming this one does too but I don't know which one it is and I don't want to figure it out via trial and error for the exact reason you mention. Can't find an explanation of how this version is adjust though. It is the later TTL meter that automatically turns off after about 30 seconds and has less current draw.