Graham, i do think, you've got a) unlimited ressources to money to burn, and b) have every ever yashica made lens into 2021 in your closet, collection. ;-)
I wish I had got unlimited resources as there are quite a few Yashica rarities that have been beyond my pockets but the one good thing that happened to me in 2020 was a successful claim against several companies that mis-sold payment protection insurance to me which gave a major boost to my depleted finances. And as we've been in lockdown through most of last year, what better way to spend your money than on items of interest (hopefully) to the great members and readers of this Forum?
I think I've got most of their lenses but there a few M39 ones that are still missing...not to mention that damned elusive ML 400mm f5.6!
I see Yashica M39 lenses pop up now and again on EBAY -- EXCLUDING enlarging lenses -- not that I'm looking for them. As you know, lots of Japanese camera manufacturers got their start -- such as Minolta -- making Leica replicas with, of course, M39mm lenses. Many of the older Japanese M39 lenses have incredibly high asking prices -- well beyond MY budget.
One thing to note. Non FB members on this forum won't be able to see those images at all anyway, so any links used need to be publicly accessible without having to log in somewhere to view them. Flickr works, self-hosted public galleries work, and sites similar to imgur also work.
I have a copy of an Auto Yashinon 3.5cm f2.8 - Yashica Japan which looks just like the one in the middle. I presume it'll be the same optics as the DX 35mm f2.8.
Does your copy have an S prefix for its serial number?
I have seen photos of such a lens attached to a Penta J on a Facebook group and so have added it to our Draft Lens List. Its provenance remains unknown right now but is under investigation. If Yashica's sequential numbering system applies to this unusual lens, it would appear that there could be at least 524 further copies around. However, if the S. prefix indicates that this may have factory-serviced/modified, then it may be much rarer. Regardless, it is intriguing...
As to its optical similarity to the DX, well, the configuration is probably 6/5 which was the formula adopted from the introduction of the Pentamatic version of this focal length until the arrival of the Auto Yashinon DS-M & later ML lenses which used a much revised 7/6 formula.
Yes indeed. I posted the images on the FB group hoping to link them here but I struggled to get it to work !! The serial number is No. S. 380525 . The lens has click stops at half f-stops. Minimum aperture is f16 and minimum focus distance is 0.4 meters. I bought the lens about in the UK from a dealer in this year. In the FB posting it appears attached to my Penta J which came from a different source.
I hope you don't mind but I've uploaded one of your photos to my Flickr pages as I have a request from Chris Whelan, a Yashica expert, to see an image of the lens. He has advised me that 3 other S. prefix lenses are known - all are Auto Yashinon lenses on J-P bodies - and I hope to track down the database which I think was produced by Yashica legend Paul Sokk. Still no one is absolutely sure what the prefix signifies but it seems possible that they were replacements, perhaps for a damaged lens, and after servicing had a new dress ring added to reflect this. I'll keep digging but I hope you don't mind me sharing one of your piccies.
Graham ,many thanks for uploading the image (something I'd failed to achieve)
I'd not picked up on the odd serial number but was intrigued by the focal length being designated in cm. rather than mm. The full stop after the "S" is much smaller and not as deep compared to the one after "No". Maybe of no relevance but might fit with your idea that the beauty ring was altered at some point. The lens is very clean and mechanics are very smooth and there is very little sign of use. Adrian