Lens Mount

ced · Jul 21, 2017

Hi guys/gals. Can anyone identify these brass lens mounts and for which camera/s they were intended?
Thanks.

Ian Grant · Jul 21, 2017

I've a similar mount however it came in a job lot of brass mounts so I have no clue what camera it came from.

The one on the right possibly have held a Dial-set Compur #0, these came in 3 tube sizes the most common is similar to a later Rim-set Compur just a different thread pitch, there was one with a narrower tube so smaller diameter fit. Gauthier made similar sized shutters (Vario, Inso, Ibsor, Pronto. The One on the left would tak a Compur #1 Rim-set or Dial set.

Ian

ced · Jul 21, 2017

Ian, thanks!
One was on a Compur Shutter housing a 135mm f6.3 Tessar but not sure if it belonged to a pretty beat up 5x7 wooden camera (no identity) which was in the same box of junk at a flea market.

Old-N-Feeble · Jul 21, 2017

The image below is the back of the lens from an old Voigtlander folding plate camera. I was unable to remove the bayonet adapter, which replaces the typical retaining ring. I hope the image is clear enough to see the bayonet adapter ring.

Ian Grant · Jul 22, 2017

ced said:
Ian, thanks!
One was on a Compur Shutter housing a 135mm f6.3 Tessar but not sure if it belonged to a pretty beat up 5x7 wooden camera (no identity) which was in the same box of junk at a flea market.

A 135mm f6.3 Tessar would have been on a 9x12 cm Ayus style camera and as Old-N-Feeble note probably a Voigtlander their top models could take interchangeable lenses, Ihagee gad a similar system as did one or two other companies. Your lens was made around 1927/8.

The f6.3 Tessar lenses are the sharpest over-all and the smallest, less common than the f4.5, I have a 135mm f3.5 Tessar on an Ihagee Zweiverschluss Duplex and it's very significantly larger as is its Compur shutter. The faster the speed with a Tessar the less the coverage (image circle) and the softer they become at the corners and edges at wider apertures.

Ian

ced · Jul 22, 2017

Old-N-Feeble, thanks the bayonet shape clearly the same same as I have.
Ian & Old-N-Feeble would my Tessar cover 4X5 or even 5X7 with the centre still being sharp and the edges not so important?

Ian Grant · Jul 22, 2017

Your 135mm Tessar will cover 5x4 with little room for movements, it won't cover 7x5. It'll give best sharpness at f22.

Ian

AgX · Jul 22, 2017

I am completely ignorant on this kind of bayonet.
How does it work? I mean these two studs (located below at the first photo).

Old-N-Feeble · Jul 22, 2017

Here's a pic of the front of the Voigtlander plate camera, showing the mating surface for the bayonet adapter ring. The three evenly-spaced chromed studs are fixed. The chrome thing at the top, near the hole, is a latch.

ced · Jul 24, 2017

Old-N-Feeble, Thanks, that says everything about the lensmount ring I was searching for!

ced · Jul 24, 2017

Ian, Thanks for that info on 4x5 coverage!

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