tim57064 wrote:
Mogul wrote:
Regarding your purchase of the Gossen Luna pro CDS, you have an older, less accurate model. See if you find a Gossen Luna Pro SBC. I believe the Luna Pro Six also has the silicone blue cell in it.
UPDATE: The Pro Six is not a silicome meter, but is the older CdS.
Okay,so as far as the manual models go, because of the price,I have to stay away from the digital models, which meter should I have? I had to buy batteries for my Luna Pro CDS and was only able to get the 1.5 volt. Is that going to throw of the reading?
quote=Mogul Regarding your purchase of the Gossen... (
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If you are talking about Alkaline, yes the meter will read off a bit. That can be adjusted for by fudging the ISO/ASA value. I can't remember which way and how much you have to fudge. You can google for that information.
Another problem is that if you are using Alkaline batteries, they do not have the flat discharge curve that the original Mercury batteries do, and that Silver Oxide and Lithium batteries do. So, when you put them in the voltage is too high, then in a few weeks they hit the right voltage for a bit, and then they drop below that and are off in the other directions. So compensating with the ISO/ASA settings is very temporary.
There is a battery adaptor for the old Gossen Luna Pro SBC that allows the use of current silver oxide or lithium batteries, which have the flat discharge curve. However that adaptor (google Gossen Luna Pro battery adaptor) is pretty spendy.
There are also the Wein Cell MBR625 Zinc Air batteries, which have a flat discharge curve, are an appropriate 1.35 to 1.4 volts, but have a short life span. You can find them on eBay. You can get them in four packs and more.
Then there are the kludge work arounds with various button batteries and O-rings. The discontinuance years ago of the Mercury batteries is no reason to sideline and old camera or meter to use them.
There are plenty of alternates and kludge workarounds to shoot them properly.
Otherwise, you may be able to send such meters to Quality Light Metric in Hollywood (They've done meters for the movie industry for years) and have them calibrated for current batteries.
Using constantly changing Alkaline batteries is the poorest alternative out there because of the changing discharge curve.
Good luck. It is a good meter. The later SBC (silicone blue chip) model would have been better because of it's extended EV range, and it uses readily available 9 volt, or 6 volt batteries. (I seem to recall the 9 volt on the one I had)