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  1. Re: A source of valuable data on French lens makers and their products.

    This has the standard layout of the booklets I have - the Hermagis one has a more simple layout with no complex photo montages of different versions/sizes etc.
    Actually, the left- hand page shows...
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    Re: What are these spots?

    Schneideritis.

    See


    https://www.largeformatphotography.info/forum/showthread.php?152105-What-is-quot-Schneideritis-quot-or-What-are-those-white-specks-in-my-lens
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    Re: 16 inch f/3 Hugo Meyer Speed lens

    You might want to check out Jakub’s example here.

    https://www.largeformatphotography.info/forum/showthread.php?157089-FS-Hugo-Meyer-400mm-f3-petzval-lens

    Hugo Meyer sold quite a lot of these...
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    Re: ULF histórica

    https://www.largeformatphotography.info/forum/showthread.php?154350-Any-information-on-the-Holterman-and-Bayliss-Plates-Lens-that-was-used

    And
    ...
  5. Re: Need help to identify brass lenses and LF camera

    it is unlikely you will get an answer as these look pretty anonymous (late 19th/early 20th C.). Photos of details, rather than total lens, might help. The camera is a tailboard type with some...
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    Re: Need Grubb Lens Expertise

    This has already been noted on the literature - mostly in the 19th Century - in Trail Taylor’s collected articles. Grubb is reported as being annoyed, but didn’t get involved in the...
  7. Re: A source of valuable data on French lens makers and their products.

    Good!
    I have the impression that the original print of 100 numbered copies of each booklet has been added too! Only one of booklets I have has a number alongside the “ /100”!
  8. Re: A source of valuable data on French lens makers and their products.

    The Darlot guide was sold put some years ago, but may have been reprinted since. Last time I bought one, I think I wrote through the website mail system requesting confirmation of availability. I...
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    Re: Stuck lens whenever on large Derogy

    The first photo shows a selection of Derogy’s aplanats. The two on the left show the two versions of size no. 4. The top one - with lens in the lens hood assembly - is the early one. The second photo...
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    Re: Stuck lens whenever on large Derogy

    I have the no. 7 - serial no. Is 18661.

    Unfortunately, the front lens cell is part of the (very robust) lens hood assembly. Derogy sold lots and lots of these aplanats, so perhaps a design change...
  11. Re: Strange glass seperation / dirt inside lens element / Need help to identify

    I was just guessing it was the same Kranz I bid on - there are very few this big around!

    Yes this is not a difficult service of the achromat - it will as good as new.The photos on the other...
  12. Re: Strange glass seperation / dirt inside lens element / Need help to identify

    Painting the Ground glass len’s edges Black was very much a UK habit in the 19th Century! Traditional French and most German makers didn’t consider it important and wrote lots of Strange Numbers and...
  13. Re: A source of valuable data on French lens makers and their products.

    I have some concerns about the publishing of these comprehensive booklets on French lens makers in the 19th century. The website seems to be
    unchanged for some time and the “booklets under...
  14. Re: Strange glass seperation / dirt inside lens element / Need help to identify

    There is a side view of the achromat in another of the OP’s threads about his current challenges. This shows “beads” of leaking balsam which are showing the typical white deposit from drying out...
  15. Re: Brass Lens Front Element is loose / Need help

    Agreed. I am surprised Kranz used this system. Damage always happens when amateurs like us try to raise the edge, especially when this is the third time it has been done (for rebalsaming every 75...
  16. Re: Voigtländer Petzval 3B rear lens element is missing / Need help

    Hello guys, I just bought this beautiful Voigtländer Petzval at an auction. Maybe it´s a 3B because the diameter is 2 inches.

    But there´s a problem... The "magnifying" rear element is missing. I...
  17. Re: Strange glass seperation / dirt inside lens element / Need help to identify

    I bid for this very large Kranz Petzval too! But under 1/4 of the winning bid.
    It was described as having heavy separation, but no image of the glass itself!
    The auctioneer is notorious for a very...
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    Re: Shutter for Heliar 300mm 4.5

    Many People have done it ( mounting the copal sinar shutter behold the front standard )!

    I have a tailboard 18x24 cm camera which I modified to Mount the copal shutter between the bellows and the...
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    Re: Shutter for Heliar 300mm 4.5

    Very Nice design.
    The only problem I can see is that the clearance between the Iris clamp and the shutter opening is very limited, meaning that you can only Mount lenses which have the male flange...
  20. Re: Jamin Darlot Lens Restorer in UK or Europe or anywhere really!

    Sometimes the balsam has leaked into the tiny air clearance in the brass cell so the glass is stuck. Placing the complete cell into a sealable container with xylol will loosen the lens.

    Look for...
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    Re: Shutter for Heliar 300mm 4.5

    It is right because of having coverage for 8x10 - whilst the 300mm Heliar was designed for 16x21cm - close to full plate size. This applies to both the original Heliar design and the later Dynar...
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    Re: Shutter for Heliar 300mm 4.5

    The “right” Heliar for 8x10” is the 360mm.

    The Sinar shutter is super for barrel lenses. But best on a Period Sinar system or one of the few modern camera Systems designed to accept the genial...
  23. Re: Jamin Darlot Lens Restorer in UK or Europe or anywhere really!

    Sometimes rack and pinion portrait lenses have been “fixed” by the boss in the portrait studios so that the staff use the rear adjustment available on the studio camera for fine focus adjustment....
  24. Re: Looking for Voigtländer Lens Catalogue especially for older Petzval types

    Good Luck !

    I havn’t been able to find one.
    If you do find one, it will look very much like this one for his colleagues in Vienna, Waibl.

    http://photohistory.at/waiblPL.pdf

    There is some...
  25. Re: Need help to identify this Voigtländer brass lens

    Which makes it look like a series IV f.6 no. 5.

    Focal
    Length 17.5”, front (and rear ) Lens 3 1/8“ coverage 14x17”
  26. Re: Need help to identify this Voigtländer brass lens

    This is the thread you need to Read.

    https://www.largeformatphotography.info/forum/showthread.php?79350-Archaic-Proto-Euryscope

    Or this list.

    I have added this new C to our early Euryscope...
  27. Re: Cooke Series II 12.75" Anastigmat - Disassembly, Stuck Focus Ring

    All information needed is already posted here!

    For example : https://www.largeformatphotography.info/forum/showthread.php?158822-Help-with-a-13-quot-Cooke-series-II-missing-a-screw


    Or
    ...
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    Re: Voigtlander Barrel issue

    My personal experience with older iris leaves is not good. Fixing pins into thin leaves is just about impossible. A more permanent solution is to convert to low technology Waterhouse slots and stops....
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    Re: W. Butcher & Son, Rapid Rectilinear

    A very comprehensive history of Butcher is available on the excellent early photography website (and Aldis, too).


    http://www.earlyphotography.co.uk/site/companies.html#B
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    Re: W. Butcher & Son, Rapid Rectilinear

    Yes, EC is (was, I believe) east central. I think, the E codes have been altered since I (fortunately) left the UK in 1971.
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    Re: W. Butcher & Son, Rapid Rectilinear

    Butcher was a less glamorous company in the UK. Active from about 1895 until 1925. Known as a buy-in specialist - especially from Germany until 1914!
    Included in Channing /Dunn book (see below).
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    Re: W. Butcher & Son, Rapid Rectilinear

    Correct!
  33. Re: Bentzin Field Camera early 20th century

    Richard Bentzin was the father of Curt Bentzin. The son was the innovator, but his father was obviously a real craftsman.
  34. Re: Bentzin Field Camera early 20th century

    Just a short follow-up!

    I made the following image for our very courteous OP!
    Not The sharpest of images, but perhaps OK in relation to it’s use as an illustration of a past event in 1911. It is...
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    Re: Auzoux & Cie Petzval lens information~

    Just a note to mention that AUZOUX is the correct spelling! Many (myself included anno 2015!) have been misled by the engraving of “u” in the brass.
    ...AND, AUZOUX alone is a much later company...
  36. Re: Bentzin Field Camera early 20th century

    If you press on my name,you can send mail directly to my email address. Or to stevenbtribe at icloud.com.
    I have plenty of Goerz lenses around 210mm (but only the series III ) I could mount.
  37. Re: Bentzin Field Camera early 20th century

    Camera open without extensions - a bit dusty! A combination of camera/plate holders/wood tripod would match the text best.
  38. Re: Bentzin Field Camera early 20th century

    There was quite a lot of development of field cameras in Germany at this time. Too much, as the variety of models offered by the many makers lead to very little profitability with crisis mergers as a...
  39. Re: Vogtlander Petzval rear optical element dimensions

    Here are the best optical formulae Available for early Petzvals!

    You can choose between various Voigtlander and others.

    http://www.dioptrique.info/base/obj_1914/avant-1900.HTM
  40. Re: Vogtlander Petzval rear optical element dimensions

    Unfortunately, physical size ( diameter of lenses ) doesn’t identify the specific 1864 Petzval you (by proxy!) have!

    Voigtlander was already making many versions of Petzvals (Speed/Focal...
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