Re: [W&B] What is it ? redux

[SBShohet at aol.com]

Hello Bernard and Christopher, 

 Bernard, I think your idea is the most reasonable so far.   There are indeed 
interior threads inside the slightly extended lips at both ends of the lens 
tube. (these look like filter threads on conventional lenses, though they might 
be there to receive the 'collets' which hold the glasses in place). There are 
certainly no Jamin or Darlot marks anywhere.

Christopher, I'm still a bit unclear of how a Centralizateur worked or was 
arranged, but I can tell you that the optics here were not particularly fast 
like a Petzvel. The glass diameter is about 30 mm. which with the stated focal 
length of 175 mm. translates to a speed of just a bit better than F 6.   

The mystery continues.   Steve


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