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Schneider-Kreuznach Tele-Xenar 7,5cm f3,8, Robot (M26) Mount
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PostPosted: Thu Nov 07, 2019 3:45 am    Post subject: Schneider-Kreuznach Tele-Xenar 7,5cm f3,8, Robot (M26) Mount Reply with quote

Schneider-Kreuznach Tele-Xenar Robot (M26) mount, 7,5cm f3,8 lens, Serial #1758XXX, was made in 1939?









Last edited by cellotone on Thu Nov 07, 2019 7:48 am; edited 2 times in total


PostPosted: Thu Nov 07, 2019 6:34 am    Post subject: Reply with quote

that's interesting, first i've ever heard of M26 mount


PostPosted: Thu Nov 07, 2019 7:13 am    Post subject: Reply with quote

benadamx wrote:
that's interesting, first i've ever heard of M26 mount


Smile, Yes, the Robot lenses are 26mm screw mount.

http://corsopolaris.net/supercameras/robot/26mm.html (mine looked similar to the #1788XXX 7,5cm f3,8 one).

http://forum.mflenses.com/question-robot-screw-mount-lenses-different-thread-sizes-t78568.html (tb_a's post).


PostPosted: Thu Nov 07, 2019 11:35 am    Post subject: Re: Schneider-Kreuznach Tele-Xenar 7,5cm f3,8, Robot (M26) M Reply with quote

cellotone wrote:
Schneider-Kreuznach Tele-Xenar Robot (M26) mount, 7,5cm f3,8 lens, Serial #1758XXX, was made in 1939?





Quite wonderful Like 1 .

1.600.000 is reported in the link below as September 1939.
1,800,000 as June 1942.

http://www.ground-glass.net/large-format/schneider-lenses-age


PostPosted: Thu Nov 07, 2019 7:21 pm    Post subject: Reply with quote

Like 1 I have this lens in robot mount that needs work its old black finish peeling. I also have one in the AKA mount. I had a akarelle I stole the mounting flange from to make an AKA m42 adapter, but have yet to finish the project. Is this lens the version with heavy brass with polished chrome?


PostPosted: Thu Nov 07, 2019 8:53 pm    Post subject: Reply with quote

jamaeolus wrote:
Like 1 Is this lens the version with heavy brass with polished chrome?


Thank you!

Yes, here are the pictures, an early version.





PostPosted: Thu Nov 07, 2019 9:01 pm    Post subject: Re: Schneider-Kreuznach Tele-Xenar 7,5cm f3,8, Robot (M26) M Reply with quote

Sciolist wrote:


Quite wonderful Like 1 .

1.600.000 is reported in the link below as September 1939.
1,800,000 as June 1942.

http://www.ground-glass.net/large-format/schneider-lenses-age


Thanks for the info!

That probably would be a 1941, or early 1942 lens.

Thank you!


PostPosted: Thu Nov 07, 2019 11:25 pm    Post subject: Reply with quote

My AKA version is identical save for the mount. Just a gorgeous lens. I really must get that project finished


PostPosted: Fri Nov 08, 2019 12:53 pm    Post subject: Reply with quote

cellotone wrote:
benadamx wrote:
that's interesting, first i've ever heard of M26 mount


Smile, Yes, the Robot lenses are 26mm screw mount.

http://corsopolaris.net/supercameras/robot/26mm.html (mine looked similar to the #1788XXX 7,5cm f3,8 one).

http://forum.mflenses.com/question-robot-screw-mount-lenses-different-thread-sizes-t78568.html (tb_a's post).



To be precise, there are two other Robot mounts, both interrupted thread breechlock mounts, the 31mm diameter Robot Royal mount and a rare 45mm diameter mount Robot used on a few of the last digital cameras they made. I have a modern version of your lens, a 75mm f/3.8 in Robot Royal mount. I now use a 31mm-M39 adapter in a focussing helicoid to give me an extended focus range on my Sony A7.


PostPosted: Fri Nov 08, 2019 2:11 pm    Post subject: Reply with quote

cellotone wrote:




... an early version.





They are lovely things though, aren't they? Want one.


PostPosted: Fri Nov 08, 2019 5:03 pm    Post subject: Reply with quote

dickb wrote:

Quote:
To be precise, there are two other Robot mounts, both interrupted thread breechlock mounts, the 31mm diameter Robot Royal mount and a rare 45mm diameter mount Robot used on a few of the last digital cameras they made. I have a modern version of your lens, a 75mm f/3.8 in Robot Royal mount. I now use a 31mm-M39 adapter in a focussing helicoid to give me an extended focus range on my Sony A7.



Thank you for clarifying these. I use a Robot 26mm to Sony E adapter directly mount to my Sony A7r, the adapter also designed for extra few millimeter extension, so brings the min. focus distance closer.


PostPosted: Fri Nov 08, 2019 7:03 pm    Post subject: Reply with quote



This is what the modern version looks like, it was produced in 2000 according to its Schneider serial number. These exist in both M26 and Robot Royal mount. I don't own any M26 Robot lenses currently, but be careful which type you get when using full frame cameras. I once owned both an M25 (C mount) and Robot Royal version of a 150/4 Tele Xenar, and the C mount vignetted severely on my Sony A7, whereas the Robot Royal lenses of 75mm and up are free from vignetting. Is your M26 7.5cm free from vignetting at infinity focus on full frame? Also, is the aperture wide open at f/3.8? On mine the blades are still visible. I have heard rumors that these could be made to open completely, but I haven't tried that yet.


PostPosted: Sat Nov 09, 2019 5:38 am    Post subject: Reply with quote

dickb wrote:

"Is your M26 7.5cm free from vignetting at infinity focus on full frame?"

Slightly vignetting on full frame, I shoot on APS mode.