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... small waterfall on the river
foggy and heavily diffused light morning. 4x5 scanned and cropped negative.

ebOny SV45TE. Sinaron W90/4,5. Foma100. ID11


...

The negative looks good.
Like your work with the collodion. Thanks, Paul.

Thanks Rick, that encourages me...

Thanks, I could only do two shots in that spot. That morning three holders fell into the water...
I have much to learn.

Thanks Dirk, maybe the pose is a bit strange...

... it was a cold September, before the Indian summer.

ebOny SV45TE
Ilford fp4

197655

Congratulations, very nice lens.
(How I would like to shoot some plates with a lens like that one day....)

Please, if someone has a petzval lens of the Optical Institute of Munich post here, mine #5350
Many thanks.

..........

In 1821 and 1823, shortly after Fresnel’s studies of interference phenomena had received general attention, Fraunhofer published two papers in which he observed and analyzed certain...

For those unfamiliar with the character of Joshep Fraunhofer a short summer reading...

Fraunhofer, Joseph
(b. Straubing, Germany, 6 March 1787; d. Munich, Germany, 7 June 1826)

Fraunhofer...

Sorry reddesert for not including the links to the journal reference.
Thank you very much for the contribution.

Thanks Steven,

The mysterious Optical Institute of Munich and the lens production continues to intrigue me. I don´t find a single photo of a petzval similar to this one. I would like to see the...

I'm still looking for the origin of this petzval lens.
I have found an article by Karl Ventzke in which the Munich Optical Institute is mentioned in relation to Joseph Fraunhofer. Unfortunately I...

Never saw one like this Rodenstock...

Schneider has one that matches the description
Designation. IIi. 1.5 M58x0.75 M72x0.75
Recommended focal lengths. 43

****Sorry, matches...

It could be related to this ???
https://www.fraunhofer.de/content/dam/zv/de/documents/FraunhoferinBenediktbeuern_tcm7-778.pdf

Maybe a German user can give us more light about...

Searching the web, I can´t find information about this petzval lens.
If someone can help, many thanks in advance.

Seems to be a 360mm F4, according to the hood engraving. (Short hood and Iris)...

Maybe I'm wrong and the Roman number is not a VI and is an IX.
This would coincide with the numbering of the barrel VIIII .... ??

Right...
There is a Roman numeral VI in the hood and in the two lens houses.
There is also an VIIII in the two pieces of the barrel.

Hi Steven,
the lens in the camera focus on infinity at 210mm, measured from WHS.
Entrance of the pupil +/- 53mm.
This would give us a 210mm f3,96 = f4.
If I measure from the rear element, focus...

Hermagis #27564
Total length with hood 140mm.
Diameter of the lenses 61mm.
Achromat: Hermagis Opticien a Paris.... (52-80-92)
Rear Flint: Hermagis a Paris.... (82-56-92)

#7 210mm F4 1892 ...

One more... #27564.
Bought it a few days ago, I hope it arrives on Monday.
Seller don´t describe anything. Pinion missing and a dent in the brass.
I have no idea of ​​the focal length...
In photo...

If I put the ring between the elements and close the cell I will damage the elements, for sure.

As it came mounted (ring-lens-lens) the elements only touch each other very on the edge (+/- 1mm)...

Well, when I first removed the back cell I found this ring, then the flint, and then the crown.
(from inside / outside the lens).
Then I thought, another petzval badly assembled ...
Then dismantle...

Anyone own one of these?
Could take a look and tell me how the rear elements are mounted?
... and what is the spacer ring thickness if really there is one mounted between the flint/crown?

Thanks...

thanks Greg
The problem is that I do not know the thickness of the spacer ring.
I think the correct distance between both elements will be important, or not?

Flint and Crown fit perfectly in...

Thanks Garret.
Do you have any of these ???
Could you give me the measurements of the spacer ring ???

... (I was thinking, that by the curves of the elements (flint / crown) was a "Dallmeyer"...

I am cleaning the glass of a B & L 18in petzval projection lens. I think it's an F8.
When disassembling the rear element I find the flint and the crown.
Flint inside - Crown outside. It looks like...

... This example has the marks on the outside of the back cells. The inner cell a mark. The outer cell has four numbered marks (1 2 3 4)

.... This lens also arrived badly assembled. The front...

Awesome! Both seem to be in mint condition.
The lacquered finish of mine has suffered a bit in the part of the barrel where it has the engraved.
I will immediately turn that part of the barrel...

Quite so!.
But we are not going to enter into patent discussions that I think we already have clear, or in wars of European or American manufactures. The important thing is to rescue this lens to be...

... No, the front cemented crown/flint is badly placed between the iris and the last part of the lens body. The correct fit is between this last part and the hood. Very dirty in the photos but glass...

I only meant that people are more focused on names like Voiglander, Dallmeyer etc.
I have followed your comments in this forum and I am sure that you do not take this into account, I do not consider...

Nothing to say. Totally agree...
It was just a way to identify the lens by the configuration of the rear elements.
Thanks.

Thanks Jim.
Tomorrow I will post more pictures.
And really a bargain. People are focused on the petzval of cult and misleads these jewels.

Many thanks, Karl.

Thanks Master.
The lens is complete and original, measures 25cm tall, 16cm flange diameter and weighs +/- 4 Kg so a rather large lens. Is in fine condition, there is some tarnishing to the brass but...

...Sorry for my bad english

By the serial number, would it be possible to know the manufacturer ???
Thanks Mark.

I just gave this lens a first cleaning. The lens arrived home a few days ago...
Looks like a B & L petzval. The lens is engraved... EASTMAN PORTRAIT F4 16In.
Seems a copy of the English Dallmeyer...

Thanks John.

Sorry for talking about money, I'm really a rookie.
I'm thinking about making a set of waterstops if finally buy the lens. The lens comes with one that I think is the middle of the...