Measure the iris in the barrel and close the Alphax to that same "hole" size. Mark that position on the Alphax/Betax and call it whatever f-stop is on the position of the barrel. Just repeat for the...
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Measure the iris in the barrel and close the Alphax to that same "hole" size. Mark that position on the Alphax/Betax and call it whatever f-stop is on the position of the barrel. Just repeat for the...
I fitted one directly from the original barrel into a #4 Alpha for a friend. A very capable lens.