djkloss
Subscriber
Is it possible to use a different method? My father used to use an Ohm meter and a photo cell? Any thoughts on using something like this to test film?
Thanks,
Dorothy
Thanks,
Dorothy
djkloss said:Is it possible to use a different method? My father used to use an Ohm meter and a photo cell? Any thoughts on using something like this to test film?
Thanks,
Dorothy
df cardwell said:Using your imagination and judgement is always more effective than using a densitometer.
Jim Jones said:I wonder if negatives can't be scanned and a reading made on an image editor? You wouldn't have an absolute reading, but even a comparative reading might be useful.
Chan Tran said:3. It's possible to use a photocell and an ohm meter. This method is fairly accurate once you calibrate the photocell using again a known step wedge. The problem is unless you already have a good ohm meter it could cost more than a good used densitometer on ebay.
Chan Tran said:If you put the photocell under a negativeless carrier and it read 500 ohms. When you put in your negative it reads 2500 ohms then what is the density of your negative?
Chan Tran said:If the light level without the negative is 5x the light level with the negative then you're correct. However, photocells do not respond in such a manner.
df cardwell said:Using your imagination and judgement is always more effective than using a densitometer.
RalphLambrecht said:I wonder what you can do with imagination and a densitometer then.
RalphLambrecht said:I wonder what you can do with imagination and a densitometer then.
Chan Tran said:3. It's possible to use a photocell and an ohm meter. This method is fairly accurate once you calibrate the photocell using again a known step wedge. The problem is unless you already have a good ohm meter it could cost more than a good used densitometer on ebay.
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