radiocemetery
Well-known
Hello,
I had a FED 3.5 50mm collapsible from my FED 2😀 apart on my bench tonight because at small aperatures the opening formed was keyhole shaped. The cause, of course, was that one of the little pins had lost it's assigned place in the lens barrel. Problem found and solved. So the question is which way should the aperature blades be oriented? When I took this lens apart six of the blades were oriented so that the rounded end of the blade was visible when looking into the lens from the front. The other three blades were oriented so that the pins on the squared off end of the blade was visible. Does this make any difference? Who cares?
And one more thing. The barrel that the aperatures fit into has a flange with the holes that engage the pins of the blades. This flange in my lens resembled a potato chip more than a flange. I reasoned that this part was not manufactured that way. So I took 2 sockets that fit nicely on each side of this flange, made a socket and flange sandwhich and pressed the whole mess together carefully. and now the flange is straight and the pins will not escape their holes any more because the clearance caused by the wavy potato chip flange is no more. Anyone else ever see this?
Well thanks for reading this long winded post and for any responses.
Steve
I had a FED 3.5 50mm collapsible from my FED 2😀 apart on my bench tonight because at small aperatures the opening formed was keyhole shaped. The cause, of course, was that one of the little pins had lost it's assigned place in the lens barrel. Problem found and solved. So the question is which way should the aperature blades be oriented? When I took this lens apart six of the blades were oriented so that the rounded end of the blade was visible when looking into the lens from the front. The other three blades were oriented so that the pins on the squared off end of the blade was visible. Does this make any difference? Who cares?
And one more thing. The barrel that the aperatures fit into has a flange with the holes that engage the pins of the blades. This flange in my lens resembled a potato chip more than a flange. I reasoned that this part was not manufactured that way. So I took 2 sockets that fit nicely on each side of this flange, made a socket and flange sandwhich and pressed the whole mess together carefully. and now the flange is straight and the pins will not escape their holes any more because the clearance caused by the wavy potato chip flange is no more. Anyone else ever see this?
Well thanks for reading this long winded post and for any responses.
Steve
