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  1. Replies
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    Re: Post Your Waterfalls

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

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


    ...
  2. Thread: Nude

    by C_M
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    Re: Nude

    The negative looks good.
    Like your work with the collodion. Thanks, Paul.
  3. Thread: Nude

    by C_M
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    2,515,857

    Re: Nude

    Thanks Rick, that encourages me...
  4. Thread: Nude

    by C_M
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    2,515,857

    Re: Nude

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

    by C_M
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    2,515,857

    Re: Nude

    Thanks Dirk, maybe the pose is a bit strange...
  6. Thread: Nude

    by C_M
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    2,515,857

    Re: Nude

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

    ebOny SV45TE
    Ilford fp4

    197655
  7. Thread: CC Harrison coming

    by C_M
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    Re: CC Harrison coming

    Congratulations, very nice lens.
    (How I would like to shoot some plates with a lens like that one day....)
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    Re: Optische Institut Munchen Petzval Lens

    Please, if someone has a petzval lens of the Optical Institute of Munich post here, mine #5350
    Many thanks.
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    Re: Optische Institut Munchen Petzval Lens

    ..........

    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...
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    Re: Optische Institut Munchen Petzval Lens

    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...
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    Re: Optische Institut Munchen Petzval Lens

    Sorry reddesert for not including the links to the journal reference.
    Thank you very much for the contribution.
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    Re: Optische Institut Munchen Petzval Lens

    Thanks Steven,

    The mysterious Optical Institute of Munich and the lens production continues to intrigue me. I donīt find a single photo of a petzval similar to this one. I would like to see the...
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    Re: Optische Institut Munchen Petzval Lens

    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...
  14. Re: Which lens is this E58 4x Rodenstock center filter for?

    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...
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    Re: Optische Institut Munchen Petzval Lens

    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...
  16. Replies
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    Optische Institut Munchen Petzval Lens

    Searching the web, I canīt 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)...
  17. Re: Hermagis Serial numbers Need your help with a database

    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 .... ??
  18. Re: Hermagis Serial numbers Need your help with a database

    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.
  19. Re: Hermagis Serial numbers Need your help with a database

    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...
  20. Re: Hermagis Serial numbers Need your help with a database

    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 ...
  21. Re: Hermagis Serial numbers Need your help with a database

    One more... #27564.
    Bought it a few days ago, I hope it arrives on Monday.
    Seller donīt describe anything. Pinion missing and a dent in the brass.
    I have no idea of ​​the focal length...
    In photo...
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    Re: B&L 18in Petzval Projection Lens

    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)...
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    Re: B&L 18in Petzval Projection Lens

    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...
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    Re: B&L 18in Petzval Projection Lens

    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...
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    Re: B&L 18in Petzval Projection Lens

    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...
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    Re: B&L 18in Petzval Projection Lens

    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"...
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    B&L 18in Petzval Projection Lens

    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...
  28. Replies
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    Re: Eastman Kodak Portrait Petzval.

    ... 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...
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    Re: Eastman Kodak Portrait Petzval.

    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...
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    Re: Eastman Kodak Portrait Petzval.

    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...
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    Re: Eastman Kodak Portrait Petzval.

    ... 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...
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    Re: Eastman Kodak Portrait Petzval.

    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...
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    Re: Eastman Kodak Portrait Petzval.

    Nothing to say. Totally agree...
    It was just a way to identify the lens by the configuration of the rear elements.
    Thanks.
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    Re: Eastman Kodak Portrait Petzval.

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

    Many thanks, Karl.
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    Re: Eastman Kodak Portrait Petzval.

    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...
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    Re: Eastman Kodak Portrait Petzval.

    ...Sorry for my bad english
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    Re: Eastman Kodak Portrait Petzval.

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

    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...
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    Re: Goerz Artar 420 9,5

    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...
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