pacviewcam
3-Jul-2021, 21:57
I recently bought a large box of lens elements, probably removed from their shutters so the shutters could be used for something else. (A sure sign of a serious case of GAS)
Among the chaos, I've found that I have 3 sets of the 150mm Sironars. I believe this is the first of that line of lenses -- it's definitely not the Sironar S or later, or Apo Sironar. Another proof of this is that the rear element is much smaller than the front element.
Interestingly, two of the three sets exhibit substantial separation in both front and rear elements. One set has no perceivable separation. I've read that the first line of Sironars often exhibit this separation due to a change in adhesive at Rodenstock during that period. All three sets are pretty clean and scratch free.
I mounted the clear set in a Copal #0 shutter, and immediately found that when I screwed in the front element, it stops the shutter speed dial from turning. This indicates to me that the front element (at least) needs a spacer.
I haven't been able to find any data whatsoever about how to set this up. I think it safe to assume that both cells may need spacers.
Anyone who's reading this, if you have a functional sample of this lens, could you send me at least a measurement of the total length, front to back, of the lens "unit" mounted in its shutter? That, at least, would give me something to go by in figuring out how to shim this beast.
Also, from there I could probably extrapolate how to shim both cells, assuming that the glass of each element should be at equal distance from the aperture.
Any other info (diagrams or specification table) would be most welcome. I'd really like to try this thing out on film one day (not important, but fun, and who knows...?).
Thanks in advance for any help on this.
Among the chaos, I've found that I have 3 sets of the 150mm Sironars. I believe this is the first of that line of lenses -- it's definitely not the Sironar S or later, or Apo Sironar. Another proof of this is that the rear element is much smaller than the front element.
Interestingly, two of the three sets exhibit substantial separation in both front and rear elements. One set has no perceivable separation. I've read that the first line of Sironars often exhibit this separation due to a change in adhesive at Rodenstock during that period. All three sets are pretty clean and scratch free.
I mounted the clear set in a Copal #0 shutter, and immediately found that when I screwed in the front element, it stops the shutter speed dial from turning. This indicates to me that the front element (at least) needs a spacer.
I haven't been able to find any data whatsoever about how to set this up. I think it safe to assume that both cells may need spacers.
Anyone who's reading this, if you have a functional sample of this lens, could you send me at least a measurement of the total length, front to back, of the lens "unit" mounted in its shutter? That, at least, would give me something to go by in figuring out how to shim this beast.
Also, from there I could probably extrapolate how to shim both cells, assuming that the glass of each element should be at equal distance from the aperture.
Any other info (diagrams or specification table) would be most welcome. I'd really like to try this thing out on film one day (not important, but fun, and who knows...?).
Thanks in advance for any help on this.