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Jaroslav
Tinkerer
Username: Jaroslav
Post Number: 3
Registered: 08-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, August 13, 2008 - 03:11 am: | 
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I was somehow active member of the forum in 2002-04 but then had a break, and now camera tinkering took over again.
Perhaps, someone could shed some extra light on this lightmeter-related problem. When installing 1.35V battery into Contaflex super BC the meter needle waked up, but that was the only positive achievement. The meter is way off. The interesting thing is that it is correct in dark (3-4EV) but showing 7 stops less light at 13-14EV. Both shutter speed dial and ISO settings when moved by one stop cause accurate movement of the needle by one stop.
Could that be due to higher resistance of corroded wiring, or rather SpD cell degrading? It looks like the resistance vs light dependence is completely changed (much more flatter?). When turning adjustment resistor underneath the removable screw one can achieve better high EV metering, but again way off for moderate and low EV light conditions.
Would be happy for any hints,
Jaroslav |
Jaroslav
Tinkerer
Username: Jaroslav
Post Number: 4
Registered: 08-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, August 13, 2008 - 04:14 am: |
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Sorry, of course I meant CdS cell. |
Riccardo
Tinkerer
Username: Riccardo
Post Number: 6
Registered: 12-2007
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, September 22, 2008 - 02:39 pm: |
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in my Contaflex, placing a standard Alkaline battery yields correct enough reading even for slides. SI suppose thus that your might be off-calibration (there is a calibration accessible, if I remember correctly) or you might have an oxydation problem. Or, worst, your cell may be off. Usually CDS does the opposite to me though: correct at high values abd bad at low ones. |
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