The brass flanges are manufactured in a very complex process. For this it is necessary to find out what type of thread it is. They are rarely metric. Mostly it is a thread whose pitch is measured in revolutions / inch. For this we measure the thread optically, transfer it to a CAD program and mill the flange made of solid brass.
For this work it is necessary to contact us as we can remove the thread in different ways.
In addition, we can artificially age the brass to reduce the contrast to the old lens.
This then results in the total price, which we then share with you.