>>3617898This category of meters all work the same:
Set the ISO of your film. Take reading. The needle will move along the dial, falling onto a white or black stripe. Turn the wheel until the bookmark-like coloured index (on the wheel) align with the the stripe the needle is on.
Then look at the wheel, it gives you all possible shutter/aperture combinations for that lightlevel at a glance.
>But there are many bookmarks on wheel, which one should I align with?Check the manual (on butkus website). Usually those meters had different "modes". Like for in darker light (say, indoors), you'd flip open the cover to allow more light to hit the sensor. Some even came with extra cells attaching to the meter, to enhance sensitivity on very low light.
So depending in what "mode" you use the light in (closed cover, open cover, extra attachments), you have to align the corresponding index. That's why they're marked and colour coded.
In the manual you can find what index corresponds to what mode.
That said, if your lightmeter is using selenium cells (looks like small white pebbles), it's most probably dead.
If it takes batteries, it means it's CdS cells if silicon cells, which is fine.
