Originally posted by stevebrot Hi Shawn! Welcome to the Pentax Forums!
I might point out that this is a zombie thread.
About the only thing that can be added to the last comment above is that alkaline cells are not recommended for camera use unless it is an absolute emergency. I might also mention that while the meters in Spotmatic cameras use a type of bridge circuit, the bridge is not balanced. As a result there is some voltage dependency in low light. FWIW, I use a voltage-corrected adapter and SR-44 cells in my mercury cell cameras.
Steve
Hi Steve
No it is important for those using E6!
The alkaline cells vary both their on load voltage and internal resistance a lot during service.
The CdS cells can age and alter characteristics a lot.
I'd imagine Eric will fit a constant voltage drop diode during service if you ask, and/or recalibrate CdS cells.
Or if you like gory detail.
http://www.butkus.org/chinon/batt-adapt-us.pdf
The diodes are pretty cheap, if you can do fine soldering, there is room in a spottie to fit one.
I test camera high and low light against a known good meter every morning or day before use!
Carry spares as well...
My SP is ok with any cell better than half a stop bright or dark but that won't necessarily apply across production or CdS aging.
Noel