I bought a nice Sironar W 150mm/f5.6 (Sinaron branded) on the devil bay last year. The lens came on a Compur 1 shutter which worked fine since my last hiking in the New Zealand mountain. All the iris blade moved away from their axis. I thought it would be easy to fix (I already fixed many shutter problems) but it looks like a gorilla already put his hands in the shutter before me. Most of the threads are damaged. I did my best to fix it but I can not keep the shutter leafs popping out of their axis due to the loose screws. As I have spent enough time trying to fix the problem, I decided to replace the Compur 1 with a modern black Copal 1 harvested from a Fujinon W 180mm/f5.6 I bought on ebay (the lowest price lens available I could get on ebay with a f5.6-f64 copal 1 shutter).
The Sironar lens cells fit perfectly well on the Copal 1. The picture on the ground glass is sharp as it could be however I'm a bit concerned about the iris. The Compur 1 has a scale which goes from f5.6 to f64, same for the Copal 1 but does the Copal f22 is really equivalent to the f22 of the Compur 1?
The Copal 1 seems to be a model 47 (if it makes sense)?
The Compur 1 has the letter K written on the diaphragm scale.
Both lens seems to have the same front lens diameter (+/-2mm)...
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