Instoscope
The Drem Instoscope is an extinction meter. When viewing through the ocular one could see a number of letters. The least visible letter is explained on the table which is wrapped around the instrument. The table shows the possible shutter-speed/aperture combinations for the least visible letter.
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| the extinction meter image by Mario Groleau (Image rights) |
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| Drem Instoscope image by Anssi Puisto (Image rights) |
