Instoscope

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3134179760_4436e2fbfd.jpg
the extinction meter
image by Mario Groleau (Image rights)


The Intoscope was an extinction meter in. When viewing thru the ocular one could see a number of letters. The least visible letter was explained on the table which was wrapped around the instrument. The table showed the possible shutter-speed/aperture combinations for the least visible letter.

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