Re: Deranged Aperture Blades
It looks like one of the blades is missing. Can you return the lens for a refund?
Re: Deranged Aperture Blades
Edit #2: Wait, is this an enlarging lens? Forget what I formerly said, return it!
Re: Deranged Aperture Blades
Yes, agreed.
I received a 100 Componon-S from the US this week, it was loosely wrapped in bubble wrap, without any sellotape, and then stuffed into a Jiffy bag. I have no idea what some people are thinking. Luckily my lens was OK.
Re: Deranged Aperture Blades
If it was an expensive lens return it, otherwise repair it, getting the aperture blades back in place takes a lot of patience.
Tweezers, dental tools are a must for manipulating the last few blades that are underneath ( under-lap ? ) the other ones.
Pay particular attention to the shape of the aperture blade when you take it apart, some blades aren't symmetrical.
Re: Deranged Aperture Blades
I came up with a Plan B. I remembered I had a box of G Claron barrel mounts left over from my taking barrel mounted lenses and putting them in shutters. One of them, from a 240mm G Claron, fits well and lets front and back elements of the Componon fully seat. The difference in overall length mounted in the G Claron barrel is 0.001". The marked apertures will be slightly off, but no big deal. Apparently some of us are bokoh hounds on enlarging lenses, but I think I can live with the 5 sides aperture.
Re: Deranged Aperture Blades
Not a bad plan... but in your spare time, if you can find a lot of it, you should really try to repair that aperture. Everyone should do that once... it's a real character building experience. That is how I became such a character. :)
Re: Deranged Aperture Blades
One plus is that you can actually read the stop markings off a G Claron barrel, compared with an older chrome Schneider barrel.
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Re: Deranged Aperture Blades
The 210mm Componon-S came with only five blades, so it is easier to re-assemble. With paitience, you should be able to get yours back together.
Attachment 247853
This is how I do it on a mechanism with ten thin blades. Take all the blades off and start from scratch.
Clean the blades and the plate on which they sit.
Place the first blade.
Attachment 247847
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Re: Deranged Aperture Blades
Work your way around, adding blades one-by-one until you get to the place where they start to overlap. In this example I'm working clockwise. In the case of this mechanism, there are thee free holes showing but seven blades yet to attach. So four will overlap.
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