NOOKY / 16500 Question

[romualdo]

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On 3/13/2022 at 8:16 AM, luigi bertolotti said:

I have just tested my NOOKY with an Elmar that is even a bit older than the 1933 item you quote (is a 11 o'clock s/n 95.532 - 1932) : it can be mounted... but only in ONE of the 3 possible positions of the tube within the NOOKY... in the other two, the blades don't engage (at least, with "normal" hand force) : oh well... we are speaking of 90 years old lenses which can have been extracted-retracted hundreds times... 😉 : but, thinking well,  maybe from the intro of the NOOKY (1936) they "tuned" the manufacturing cycle of the Elmars' blades (maybe simply at tolerancing level, not changing the design in itself) to assure full compatibility (btw, my NOOKY is "old" - not the post 1939 version with the reproduction ratio scale).

 

Luigi, the flanges on my '33 Elmar are most likely just a bit too thin & no matter what position I insert the collapsed lens, it just rotates freely & doesn't tighten up/lock thus making it unstable to use with the NOOKY (the lens could easily fall out)

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[luigi bertolotti]

5 hours ago, romualdo said:

Luigi, the flanges on my '33 Elmar are most likely just a bit too thin & no matter what position I insert the collapsed lens, it just rotates freely & doesn't tighten up/lock thus making it unstable to use with the NOOKY (the lens could easily fall out)

This strengthens my above idea that from when they introduced NOOKY, manufacturing process of Elmars was modified... my one is a bit "too tight", yours "too loose", for the NOOKY... but both extract and stay firm in their own fousing mount... this one was, of course, the only mechanical engaging to take care in the manufacturing line : two machined components that ought to couple correctly : even with a certain tolerancing, one could make "fine adjustment" in line, because the item had to be completely assembled / controlled for delivery; the intro of another item (the NOOKY), which  was manufactured-delivered "alone" - not with a certain Elmar with it - surely posed the problem of stricter tolerancing on the blades of Elmar's lens tube. 

It's someway a story that resembles the advent of the "Standard LTM mount" : when you deliver a camera with one (or 2, or 3...) lenses with it, you can adjust in line their correct focusing with a certain body (*) : making  camera and lenses which must be compatible by definition, without in line control, requires different - better tuned - manufacturing process.

 

(*) and mark them as such - as Leitz did with the "3 digits" non standard lenses, which matched the last 3 digits of compatible body

Edited March 14, 2022 by luigi bertolotti