In yesterdays rummage in the old kit bag I found 2 old light meters. Just taken quick pics - nothing fancy also of my Gossen. I am guessing that the Johnsons manual calculator is from the 50's. Lots will recognise the Weston as it was sold in various Marks over a long period. The Gossen is far more up to date and I still use it. The attachment clips on the front and gives 15 and 7.5 degree area readings.
When you put all three together and then consider todays fancy built in systems it shows how far technology has advanced.
Don
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