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A mysterious lens : Konica Hexanon SL 35mm F:2.8 M42
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PostPosted: Thu Jan 29, 2015 9:19 am    Post subject: A mysterious lens : Konica Hexanon SL 35mm F:2.8 M42 Reply with quote

A mysterious lens : Konica Hexanon SL 35mm F:2.8

Nothing can be find in GOOGLE or any paper.






Yes,It's M42 mount!!! you can't find any other konica lens in M42 mount.


PostPosted: Thu Jan 29, 2015 9:22 am    Post subject: Reply with quote

What's different in Konica hexanon SL?

1.the min. focus is 1.5M
2.the min. aperture is F11



PostPosted: Thu Jan 29, 2015 9:27 am    Post subject: Reply with quote

And the aperture is also interesting.

It's octagon shape(normal is hexagon or circle)
and it's double layer blades design.



PostPosted: Thu Jan 29, 2015 9:37 am    Post subject: Reply with quote

From the missing DOF scale, large aperture value spacing and long MFD, I think it may be designed to use on some surveillance camera.


PostPosted: Thu Jan 29, 2015 1:35 pm    Post subject: Reply with quote

Interesting configuration.

Is it possible that somebody switched out the name plate for some reason?


PostPosted: Thu Jan 29, 2015 2:53 pm    Post subject: Reply with quote

JJB wrote:
Interesting configuration.

Is it possible that somebody switched out the name plate for some reason?



I don't think this name plate has been switched. The name plate itself is unlike that of any other Hexanon lens known to me. I have never seen a Hexanon "SL" lens, or one of this vintage with such a short SN. But I am convinced it is a genuine Hexanon item. It has the typical Hexanon finish, proportions, general style, lettering, and color. Most importantly, it has a bona fide looking Konica production code on the mount side: 9T (June 1979).
What the lens' purpose was I have no idea. Calvin83's suggestion sounds very possible. Perhaps the letter "S" in "S"L stands for surveillance? What puzzles me is why such a wide range of apertures for a surveillance lens. On such a lens one would wish for everything to be in focus, right?


PostPosted: Thu Jan 29, 2015 3:54 pm    Post subject: Reply with quote

Not intended as an SLR lens it seems, as it has no auto mechanism ( no pin).
Also that aperture only goes to f/11 marked.
Would be useful to know if it actually has M42 back focus.
The 42mm thread could just be coincidental. A handy thread to use for whatever equipment it was made for.


PostPosted: Thu Jan 29, 2015 4:21 pm    Post subject: Reply with quote

SL = Surveillance Lens imho.

Schneider made a version of the C-Curtagon 2.8/35 in a similarly stripped down, industrial barrel with M42 mount, nd thatlens was used in surveillance systems.


PostPosted: Fri Aug 12, 2016 10:16 pm    Post subject: Reply with quote

I recently found this lens and it indeed has M42 back focus distance. I'm using it with a thin heliciod on my A7II and I get infinity to quasi-macro. This little lens renders beautifully!



PostPosted: Fri Aug 12, 2016 11:33 pm    Post subject: Reply with quote

I like that image a lot, that's a very interesting lens.


PostPosted: Mon Dec 18, 2017 1:30 am    Post subject: Reply with quote

An example has popped up on ebay - https://www.ebay.com.au/itm/REAR-MINT-Konica-Hexanon-SL-35mm-F-2-8-for-M42-from-japan/173035761567

From a quick google I found a reference to 'SL' in context of stereolithography on a konicaminolta site - https://www.konicaminolta.com.au/glossary

I don't know anything about industrial processes - but it could be a clue.


PostPosted: Mon Dec 18, 2017 12:17 pm    Post subject: Reply with quote

Beautiful shot kuato.
Do you have a Konica AR 35/2.8 to compare to?
I'm curious what differences between them are, specifically optics and IQ.
Looks similar to the older version...




PostPosted: Mon Dec 18, 2017 1:19 pm    Post subject: Reply with quote

The serial numbers are close. I would say it is optically the same.