correcting for meter voltage on a 14?

[X360]

Is seems that the off the shelf batteries that can be used on a Lynx 14 have .2v too much.

Is there an easy correction factor to apply so that the exposure is right?

 

[T_om]

The problem with clipping diode's in the circuit, or any other solution that utilizes alkaline batteries is that the meter then becomes non-linear.

This varies over time too, so that as the batteries age, the meter becomes less and less accurate.

I found the most accurate and reasonably priced alternative is to use hearing aid batteries. These are zinc-air cells that have the same response curve as the old mercury batteries did. Same voltage too so you do not have to modify your device (meter, camera, etc.)

Tom

 

[Ambiguity]

I was under the impression from Yashica-guy that the camera could handle the .2V just fine? How would it effect the meter?

 

[Kim Coxon]

The diodes work as long as you use silver cells and not alkaline. Silver cells have a very flat discharge curve in the same way mercury cells did and will maintain their 1.55v till just before they are depleted. The cheaper Alkalines have a sloping discharge curve and will vary from 1.55v to about 1.3 just before they die. 😉

The reason the hearing aid batts work is that they rely on the same chemistry to produce the joules. The only difference is that the oxygen comes from the air instead of a small addition of mercuric oxide. The danger with them is that they are more prone to leak partly due to the air holes.

Kim

The problem with clipping diode's in the circuit, or any other solution that utilizes alkaline batteries is that the meter then becomes non-linear.

This varies over time too, so that as the batteries age, the meter becomes less and less accurate.

I found the most accurate and reasonably priced alternative is to use hearing aid batteries. These are zinc-air cells that have the same response curve as the old mercury batteries did. Same voltage too so you do not have to modify your device (meter, camera, etc.)

Tom

 

[bcs89]

The amount of expert information available on this site - just for the asking - is staggering.

 

[rjs003]

I have used a hand held meter to determine the correct film speed and then off set or bias the camera asa setting to compensate for any differences. I seldom use the manufactures asa guide# most of the time I shoot black and white film and have some latitude with film speed. While shooting large format film rated at asa 100 I normally set my hand held meter to asa 50. Play with for awhile and see what you come up with. You can read about this in Les Mc Clean book Creative Black and White Photography.

 

[Kim Coxon]

The problem with this method is that the correction will vary on the EV. Not too much of a problem with the latitude of monochrome but it can be a major one with E6. It will depend on the meter but for intance the QL17 GIII nedds about 2 stops correction at the top ens of the scale but only about a 1/2 stop at the bottom. If you use one of the other "fixes" you tend not to have this problem.

Kim

I have used a hand held meter to determine the correct film speed and then off set or bias the camera asa setting to compensate for any differences. I seldom use the manufactures asa guide# most of the time I shoot black and white film and have some latitude with film speed. While shooting large format film rated at asa 100 I normally set my hand held meter to asa 50. Play with for awhile and see what you come up with. You can read about this in Les Mc Clean book Creative Black and White Photography.