GE Type PR-1 Exposure Meter brand_Kaiser you can use it on

you can use it on any brand of lens with a 77mm filter diameter- not just Canon

with the same three-piece folding design but with a slightly different leg profile and that wonderful black crinkle finish that you just don’t see any more

You then turn the actual focus ring to match this setting

The Weston Master II is a Selenium-cell light meter with a built-in high/low light mask and an easy to read scale

GE Type PR-1 Exposure Meter brand_Kaiser you can use it onThis General Electric Type PR 1 Exposure Meter is a very old school light meter for incident and reflected light. This one somehow still works and accurately, too. No batteries required, all metal & Bakelite construction, and a nice leather case.