Problems with old light meter (quantum calcu-light xp)

[el.nino]

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Hi,

 

same question as in the the german forum.

unfortunately nobody couldn't help me yet.

 

recently i bought a quantum calcu-light xp from ebay because of its ability to measure down to -7 EV - thought i could use it for some night-photography. as it arrived i put in some fresh batteries and took a test measure. soon i found out that all measurements taken differ exactly 2 stops from the ones taken with my sekonic L-558 and minolta auto meter IV. the measurements are the same if i use ISO 400 on the quantum light meter and ISO 100 on the other lightmeters. i think i can pretty much eliminate a operating error as i am pretty sure i did nothing wrong (set the right iso, used the right measuring-method on top and on the rim...). so my question: can this be caused by the age of the lightmeter? it is using a "Blue enhanced silicon photodiode" but i don't know anything about photodiodes.

 

thanks a lot in advance,

 

daniel

 

P.S. already tried other battereis, different filmspeed setting, different lighting conditions etc.

it seems that i always differs about 2 stops.

 

P.P.S. you can find the manual and technical data here: Quantum Calcu-Light XP

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[peter_n]

Daniel I really can't answer your question about the cause of your problem, but I have two of these meters and they are both fine. I measured mine against a Megatron (modern Weston Euromaster), Minolta IIIF and an M6TTL and M7. There is a repair technician in Los Angeles who has an excellent reputation:

 

Quality Light Metric Co.

7095 Hollywood Blvd # 550

Los Angeles, CA 90028

USA

 

Phone: 323-467-2265

 

They do not use email nor do they have a web site. Hope this helps.