Meter Calibration - QL17 GIII

[cralx2000]

How to do a meter calibration on QL17 GIII to use PX-625A (1.5V) battery.?

Thanks All
cralx

 

[back alley]

if you're shooting black & white don't bother.

 

[Krasnaya_Zvezda]

Doesn't a Wein cell provide the correct voltage (1.35, I believe)?

 

[cralx2000]

greyhoundman, I'm asking this cuz I got the Konica S2 calibrated to use with 1.5V battery. I am wondering if I can do this myself on QL17 GIII. I’d like to learn how to recalibrate the meter instead to use any adapter.

I have tested the Konica S2 with Capital F4 CdS Meter and the exposure is perfect.

 

[Voyager13b]

How to do a meter calibration on QL17 GIII to use PX-625A (1.5V) battery.?

Thanks All
cralx

I like the idea proposed by the guy who simply soldered a tiny Schottky silicon diode in series with either wire running from the battery compartment of a 625 powered camers. It is the perfect solution, takes about 20 minutes to complete on a GIII, and allows you to use standard (cheap) silver based batteries that have similar voltage/discharge characteristics to the old 625 mercury battery. A Schottky silicon diode causes a predictable, and fixed voltage drop of ,2 volts in a series circuit, no matter what the voltage characteristics of the battery might be. With a 1.55 volt silver battery that offers nearly constant voltage throughout it's life (as does a 1.35 volt mercury battery), your meter will always be telling the truth until the battery is nearly dead.

Adjusting the meter to give reasonable readings with a different chemistry battery is a step back to the stone age, as the battery will need to be replaced regularly in order to keep a fresh cell that is producing a similar voltage to that which the meter was adjusted at in the first place. Even the zinc-air battery conversion is a waste of time, as one battery costs more than the entire modification, quickly loses capacity in storage, has a short working life, and is not available most everywhere.

The silver battery trick is simple to do, costs a total of about $3 for parts (including the battery), and does not change the calibration or response of the meter at all. It's a perfect solution that a DIY tinkerer can perform with confidence.

Here is the link www.colyngoodson.com/cameras.html

Voyager

 

[cralx2000]

Due to complaints by my ISP about excessive bandwidth, I have suspended my manuals page. However these manuals and others can be found Here

I will continue to provide a download for the Weston Ranger 9 manual on my Ranger 9 page Here

You can also download the battery adapter manual Here and the Light seal replacement manual Here

 

[captainslack]

Your links are clickable!!!