Hello all,
so finaly I mounted the 150mm Sironar lens cells I bought for cheap in a Compur shutter - but I am a bit puzzled how to measure the new f-stop scale needed. so the question is:
the diameter of the f-stop aperture should be:
focal length / f-stop = d
(i.e. 150mm / f 8 = 18,75mm)
ist that right?
but when comparing the calculations I did for 127 mm with the diameter of the aperture my 127mm ektar the numbers doesnt seem right, they sort of work when I measure from the front through the lens (which is more a "sort of measure")
can anybody explain the proper way to measure the f-stop aperture? directly at the aperure - or through the lens - and if how?
thank you.
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