I have just acquired a 3 1/2 inch f4 and a 6 inch f4.5 Ental II pair of lenses, but the aperture settings confuse me and I hope someone can explain them to me.
The 3.5" f4 has these aperture settings 1 2 4 8 and 16 and the 6" has two sets of markings. The first set is exactly the same as the 3.5", but above those markings in the same window it has 30 25 20 15 10 and 5 so the number sequence is reversed to the first set.
Can anyone enlighten me as to what these settings are?
Thanks
Bruce
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