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Sorry JA. You will have to excuse my stubbornness here.
Does that iris have any function in the lens then? Or is it used in wide open position at each focal length to give the specified f#?
And then it will allow adjustments to increase the f# by closing the iris?
Just so i understand this properly for the future. As you can probably tell this is all new to me.
Actually after rereading your post i think that you were saying exactly what i mentioned above.
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