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It's definitely a better version of information than what I have.
I see that some values ​​- in the French model which I have - coincide with mine, but some deviate.

I have already done the...

Somewhere on the net I found this representation of value.

Iris No | f value
1 = f/10
2 = f/14
4 = f/20
8 = f/28
16 = f/40
32 ...

When I was looking for answers on the web, it was not explicitly stated where it meant ... so I will have to test;)

Thank you for your answer.
The material is interesting, it didn't give me an answer in 100% - straightforward, but at least I know in which direction I'm going.
I will have to do some tests - I'm...

Welcome everyone,

I just became the owner of this lens: HERMAGIS 440mm Aplanat No.4 Series II. // Serial number: 36070 //

I have only one problem with it, on the lens iris - instead of the...