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#11
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But lately the stuff coming back from the lab seems overexposed, regardless
of which lens was used -- and occasionally, in the field, I get 'funny' readings that are intuitively just not right. Could the mechanicals in the motor dial be dying? Tired measuring cell? Time to put the old tool out to pasture (or under it)? Any thoughts? You don't specify which Autometer...if you remove the diffusion hemisphere from the meter, there is a metal pin which senses the presence of the diffusion disk/hemisphere. Sometimes the switch activated by the pin seems to 'stick' so that the meter does not adjust readings properly. Try pressing the pin in and take a reading, and compare it with pin out reading. It should change. If not, press the pin in and out multiple times to clean off buildup on the electrical contacts, then the the pin out reading vs. pin in reading again. Often this little 'exercise' will fix a problem with bad contacts in the switch. --wilt |
#12
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Well, it is the original Autometer Professional, ser 109375, which I use
almost exclusively with the 15 degree viewfinder. The diffusion sphere sits in the bag, dont think I have used it more than once a year, if that. What seems to be happening is that in full sun the high luminance values are reasonable -- but as light levels fall, the meter error increases progressively ending up around 2 stops off in evening and shadow situations. g "Wilt W" wrote in message ... But lately the stuff coming back from the lab seems overexposed, regardless of which lens was used -- and occasionally, in the field, I get 'funny' readings that are intuitively just not right. Could the mechanicals in the motor dial be dying? Tired measuring cell? Time to put the old tool out to pasture (or under it)? Any thoughts? You don't specify which Autometer...if you remove the diffusion hemisphere from the meter, there is a metal pin which senses the presence of the diffusion disk/hemisphere. Sometimes the switch activated by the pin seems to 'stick' so that the meter does not adjust readings properly. Try pressing the pin in and take a reading, and compare it with pin out reading. It should change. If not, press the pin in and out multiple times to clean off buildup on the electrical contacts, then the the pin out reading vs. pin in reading again. Often this little 'exercise' will fix a problem with bad contacts in the switch. --wilt |
#13
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Well, it is the original Autometer Professional, ser 109375, which I use
almost exclusively with the 15 degree viewfinder. The diffusion sphere sits in the bag, dont think I have used it more than once a year, if that. What seems to be happening is that in full sun the high luminance values are reasonable -- but as light levels fall, the meter error increases progressively ending up around 2 stops off in evening and shadow situations. g "Wilt W" wrote in message ... But lately the stuff coming back from the lab seems overexposed, regardless of which lens was used -- and occasionally, in the field, I get 'funny' readings that are intuitively just not right. Could the mechanicals in the motor dial be dying? Tired measuring cell? Time to put the old tool out to pasture (or under it)? Any thoughts? You don't specify which Autometer...if you remove the diffusion hemisphere from the meter, there is a metal pin which senses the presence of the diffusion disk/hemisphere. Sometimes the switch activated by the pin seems to 'stick' so that the meter does not adjust readings properly. Try pressing the pin in and take a reading, and compare it with pin out reading. It should change. If not, press the pin in and out multiple times to clean off buildup on the electrical contacts, then the the pin out reading vs. pin in reading again. Often this little 'exercise' will fix a problem with bad contacts in the switch. --wilt |
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