Originally posted by timw4mail Maybe for black and white film, but I'm pretty sure that meter does not have the voltage regulation necessary for accurate metering with an alkaline battery, at least compared to the original mercury battery.
I'd be happy to be proven wrong, but I'm sure an Alkaline battery is going to be off by at least half a stop.
Yes, a Minolta SR-T with a good metering system will be out about a full stop with a 1.5V alkaline battery in it. On the plus side, the SR-T is one of the easiest and quickest cameras to calibrate, as the adjustment pots for the battery test and the meter bias are under the baseplate. It doesn't take long to get it dialed in for a 1.5v battery, and linearity is excellent.
Those who claim to have had no problem with using a 1.5v battery may have acquired a camera already calibrated - mercury batteries were banned from these shores over 20 years ago, and tons of cameras got adjusted by those who knew enough to get it done.
On the down side, the CDS cells in an SR-T are physically cemented to the top of the pentaprism, and the cement they used goes yellow and cracks and crumbles - this costs the meter some sensitivity. Putting a higher voltage battery in may compensate a bit for the foggy cement and make it look like all is well.
However, whenever servicing an SR-T, I always check the CDS cells and usually have to re-cement them - which is fine because I'm usually cleaning the underside of the prism and the focus screen condensor lens etc. anyway. Only then do I go about checking calibration with a newer battery.