Hi Bill,
I think I'm following it. Since the readings vary significantly between
cover closed, cover open, and hood off, any idea how to choose or use one
over the other? Are they just to "reset the scale" in conditions of high or
low light, or do they actually measure different things depending on how
much of the cell is covered? (and if they do measure different things, what
are they?)
Thanks for all your help,
Dan Scott
[EMAIL PROTECTED]
>Dan Scott wrote (and Tiger Moses subsequently replied):
>>Anyone familiar with old, batteryless, exposure meters--specifically a GE
>>Type DW-68 (made of metal and glass, takes readings with "cover closed",
>>"cover open", and "hood off")? Were these any good/very accurate? If so,
>>how would you operate it?
>
>[Tiger's reply snipped....]
>
>Hi Dan,
>
>As promised, I dug through my closet last night and found my old batteryless
>meter. Guess what? Mine's also a GE DW-68. It still matches up pretty
>well against my more modern, battery-operated meter. Notice that your meter
>has two concentric metal dials. The outer dial has teeth, and is marked
>with three red triangular indicators labeled "COVER CLOSED", "COVER OPEN",
>and "HOOD REMOVED". The inner dial has a black face and a little index mark
>-- this is used to set the film speed. Finally, there's silver faceplate
>that does not rotate -- this has an "f-STOP" scale along the top, and a
>"LIGHT" scale along the bottom. (I don't know what the red-outlined "spade"
>and "diamond" icons are for, but it doesn't seem to matter....)
>
>To operate, set the little ASA index mark to the appropriate film speed --
>from 1.2 to 800. Next, decide whether you'll measure with the cover closed,
>the cover open, or the hood entirely off the front of the meter body. Next,
>take a reading of the reflected light from your subject, and note the
>resulting value on the meter (in foot-candles -- how 'bout THOSE units?).
>Next, rotate the outer dial so that the appropriate red triangular indicator
>on that dial aligns with the number on the "LIGHT" scale on the faceplate.
>(For example, if you read 30 on the meter with the cover open, align the red
>"COVER OPEN" triangle on the outer dial with the number 30 on the "LIGHT"
>scale.) Finally, look at the "f-STOP" scale on the faceplate to find the
>correct exposure time for any particular aperture setting. (In my example,
>the reading of 30 on the meter corresponds to 1/100 sec at f/8, given an ASA
>of 100.)
>
>Hope this helps.
>
>Bill Peifer
>Rochester, NY
>
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