Carl Dietzler petzval lens info

[Louis Pacilla]

I can remove internal stop. Does that mean faster lens?

Probably not. You would need to remove the central stop as well.

[pasiasty]

How to measure focal length of a lens:
1. focus on infinity, and measure distance between standards (any point on the front standard to any point the rear one)a
2. repeat focusing on a ruler (or something slightly shorter then your ground glass) and moving your camera to get sharp image in exact 1:1 scale; measure distance between standards (same points, of course)
3.difference between the measurements is sought focal length.

[Steven Tribe]

Dietzel was obviously looking at French constructions at this time, rather than his conservative enemy, Voigtländer. The split barrel - and the use of the front achromat as a landscape lens - looks a lot like Darlot etc.

Correction: replace Darlot with Jamin, as I think this was made in the Jamin era! The WHS was either added later or was an late change in the design before sale as the slot/engraving/focussing mount design is clumsy.

[Steven Tribe]

Just in case the OP didn't discover it - a complete look-alike Dietzler was sold on eb*y this evening for £998.

I have looked at the Dietzlers on photohistory.at and it looks like the design of the WHS cut-outs are the same on all of them, with the very restricting internal baffle/stop support.

[bracan]

Steven, what is the number of that sale? Cant find...
Thanks

Just in case the OP didn't discover it - a complete look-alike Dietzler was sold on eb*y this evening for £998.

I have looked at the Dietzlers on photohistory.at and it looks like the design of the WHS cut-outs are the same on all of them, with the very restricting internal baffle/stop support.

[Steven Tribe]

Here it is - 390766102648.

I think this represents a growing interest in non-Voigtländer vienna Petzvals. At least there don't appear to be fake lenses around!
Note that the ebay one has a 3 figure serial number and yet it has WHS. Perhaps a workshop in Vienna specialised in making the WHS conversion?

[bracan]

Thanks Steven.

[Steven Tribe]

I think we will just have to accept that some of the Vienna makers made Petzvals that were a good deal faster then Voigtländer's at the same time!

Not only are the eb*y and your Petzval around F2, but I have an almost identical one from Waibl (slightly earlier) which is also under F2.5. I enclose the "prospectus" of the one I have. At this time, cameras, with a selected objective, were sold as a complete package and not advertised separately. This come from Photohistory.at.

[mhayashi]

I was searching for Dietzler info and hit this thread.
The internal ring on the front achromat is apparently of the Orthoskop rear lens case.
There should be the rear group of Orthoskop consisting of the two elements missing now when the lens was sold or the front lens case was converted later to the convertible lens, having the portrait mode(petzval) and the landscape mode(orthoskop).

Dietzler Orthoskop was made from 1857 if I remember and WHS construction was started in 1857 based on my Voigtlander No.6 petzval sample.

So the dating of this sample is in between 1857 and 1862.