So, can be a Heliar 240/4.5 mounted on a Compound IV-10 II, to be mounted on a Compur 3 shutter?
Thank you.
So, can be a Heliar 240/4.5 mounted on a Compound IV-10 II, to be mounted on a Compur 3 shutter?
Thank you.
www.christo.stankulov.com
No, as the tables show clearly a 4 is bigger than a 3.
I can assure you that is cannot, at least not without some VERY expensive machine work (and in the case of a Heliar, even that won't help since the central lens element is larger than the opening of a #3 shutter),
Thank you Ole, I did not knew that Compound is made by Compur. My problem is that I have a very nice Heliar 240/4.5 on a original Compound, but I do not have the ring to attach the lens on the lens board. And I can not find nobody do make me this ring here in Paris. There was somebody the the atelier is closed 2-3 mount ago...
www.christo.stankulov.com
So, the "tube" refers to an actual tube threaded on both sides: male into the shutter and female for the rear lens element, yes?
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I believe that 29 1/3 TPI is actually closer to 0.9mm than 0.75mm. It can be easily calculated: 25.4mm/29.334=0.866mm
I can also confirm this by measuring the outer thread of my Compoud #3 shutter - it has 5 threads over ~4.5mm, which gives 0.9mm.
The table from this site http://www.suaudeau.eu/memo/pratique..._centraux.html also supports this measurement.
Yes, the SK Grimes website shows a pitch of 0.9mm for the flange/retaining ring thread on those Compur and Compound shutters described elsewhere as having a pitch of 29 1/13 threads per inch. I expect Ole was mis-speaking. Incidentally it looks like his last activity here was just about two years ago.
I have no idea why such an odd pitch was used; years ago I asked Steve Grimes. He didn't know either.
David
Sorry to bring an old thread back to life, but I just received a lens in a Compound shutter. I'm assuming its a #3, the shutter speed goes to 100, and it seems approximately the right size. It didn't have a flange or retaining ring, so I measured it with a pair of cheap digital calipers and the outside of the thread is 63.5mm or exactly 2.5in. I compared that to the numbers listed on SK Grimes site here: https://skgrimes.com/products/mounting-flanges/
He lists two different sizes for Compound #3--M60x.9 and M62x.9 neither of which are close to what I need. Out of curiosity (and because I don't entirely trust my calipers for fine measurements) I took a retaining ring for a Copal #3, which should be 62mm, but with a .75 thread, and it wont even fit over the rear tube before reaching the threads. So I know its definitely larger than 62mm (I wouldn't think the calipers, no matter how cheap, would be off by over a millimeter.)
I've sent a message to SK Grimes, but I thought I'd ask here as well. Has anyone seen a Compound 3 with a 2.5in thread? Or do I have something customized? FYI, the shutter is labeled "C.P. Goerz New York" on the speed dial, and it houses a "GOERZ DAGOR F:6.8 FOCUS 12 IN."
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