A shutter testing tangent. I've a Calumet shutter tester, bought new probably close to 30 years ago. It works perfectly. Recently, after acquiring a used lens, I went to check its shutter performance. Something was amiss; the tester wouldn't register past a certain count when aligning things with the shutter preview lever open. My dense brain woke up after a couple of attempts. The lamp's bulb had recently been replaced with an LED substitute. Screwing in the old incandescent bulb instead restored proper tester function.
Every time that LED's switching power supply cycled it off, my Calumet tester started counting again. Keep at least one incandescent bulb handy if you're going to check shutters.
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