Not sure if this is the best subforum - please move if there's a better place.
I'm not really a collector but lately I've been going through some of my more interesting Nikkor lenses that I've found over the years.
One of them is a very early collapsible Nikkor 5cm f/3.5 - the "copy" of an Elmar. Here's a pic of my lens and an Elmar next to it:
I read a bit online about these lenses back when I bought it but I recently discovered this short article about this batch on my usual Nikkor serial # website:
I have also re-read Rotoloni's chapter on this lens.
The interesting thing is my lens is earlier than recorded on either source - 6104x is the serial #. According them, all lenses in this serial block are Canon 'J' mounts, save one oddball in Nikon S mount. Now I do not have a Canon 'J' mount camera, but my lens threads right onto all of my LTM cameras/adapters. Wouldn't the small tpi difference between the J standard and LTM standard cause it to bind? If so, is this lens the first/only copy known of in Leica thread mount?
Does anyone else have a lens in this serial # block? The web article above mentions only 2 known examples. I have not really kept an eye on eBay with regard to Nikkor collapsible 5cm f/3.5 lenses but I do not remember seeing any other 61000 block lenses pop up since this one. I was lucky enough to see a BIN auction at a really ridiculously low price for this lens right when it was listed, and did not hesitate. This was about 2 years ago.
It's a neat bit of history and I would love to know more about it if anyone has any insight, or perhaps there are others with these lenses out there? I am happy to take more photos or check anything if requested.