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    Re: reflex viewers

    Hello from France!

    Here is an article by Hervé Ellena, in French, published in 2008

    https://www.galerie-photo.com/construire-viseur-chambre-arca.html

    An automated translation into English by...
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    Re: Hello from Paris

    Welcome on board!
    You are not the only Frenchman here ;-)
  3. Re: Drum scanning service in continental Europe (Germany, France, Italy...)

    Hello from France!

    This European company was mentioned on the French LF forum for drum scanning services.
    castorscan Milano Italy
    https://www.castorscan.com/

    In Paris, France you have PICTO...
  4. Re: Headed to Köln for 5 days tomorrow…

    Hello from France!

    I've been to Köln (Cologne) a few times to visit the Photokina, a world famous photo fair (no longer exists)

    If you are interested in photo books, you could be interested in...
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    Re: No End in Sight. Solo Show in Paris

    More about this exhibition on the gallery's web page

    https://www.galerieclementinedelaferonniere.fr/exhibitions/48-no-end-in-sight-guillaume-zuili/
  6. Re: Shutter CLA service recommendations in EU?

    Hello from France!

    In Germany I am aware of those camera repair services.
    I know them for the service they provide for Rollei TLR cameras but I'm pretty sure that they know LF lens shutters...
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    Re: Prontor Professional 3 operations

    Hello from France, and congratulations for the purchase of a lens equipped with a Prontor Professional shutter.

    In my opinion, this is the most beautiful mechanical shutter for large format lenses...
  8. Re: Help: which shutter for a Symmar 1:5,6/360?

    Hello from France!

    The problem is solved, good news, so here is some additional info for those who would like to use a 360 mm 5.6 Symmar,
    I have found this other vintage brochure...
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    Re: Arca Swiss Misura

    Hello from Besançon, France!

    To the best of my knowledge, to date (2023-01) the 4x5" Arca Swiss misura is no longer listed on the catalog.
    Since it shares many parts with the F-line system, it...
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    About PRIOX enlargers

    PRIOX was a French company based in Chinon (in the Loire Valley).
    Established in 1900, the company went out of business in 1984,
    then restarted in 1986, and definitely closed in 1995.

    From...
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    Re: Greetings from Marseilles !

    Hi and welcome on board!

    (your are not the only Frenchman here)

    (Low voice: in English, our Marseille is spelled Marseilles.
    This is the privilige of major cities in this world to get a...
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    Re: Arca Swiss F line Metric 4x5"

    For the 300 mm Nikon M the flange-focal distance is about 294mm.
    You'll be able to focus at infinity, but not at one metre of distance ,)
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    Re: Arca Swiss F line Metric 4x5"

    Hi!

    I have been using this camera for many years.
    If you go for a telephoto lens, you can focus telephoto lenses with focal lengths over 300 mm with the universal leather bellows of the 4x5"...
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    Re: Measuring old lens threads

    I have eventually found another tutorial (in French) on precisely measuring threads.

    See also
    https://amesweb.info/Screws/metric-thread-profile-form-formula.aspx

    Summary, valid for ISO...
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    Re: Measuring old lens threads

    Hello from France!

    Measuring an unknown thread accurately is a tricky business. As you say, you can't use the diameter at the top of the thread. With the tools you have, you can identify a...
  16. Re: Tilt, swing and the back nodal point

    Hello from France !

    Leslie StroebeL is perfectly correct, at least as far as you want to get a sharp image of a far-distant object i.e. an object located several focal lengths ahead. (see below...
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    Re: Ansel Adams Portrait Session

    Other pictures of the same shooting session, dated Nov. 18, 1966, are available here
    ...
  18. Pre-1984 Arca-Swiss Oschwald Lens Board Adapter and Lens Board Compatibility

    Hello from France!

    The images posted above clearly identify pre-1984 Arca Swiss parts.
    The following A3-size catalog in pdf (text is in German, sorry) allows us to identify and put a part# on...
  19. Re: What distance needed to enlarge to 30" x 40" with 135mm or 150mm lens for 4x5?

    Hi!

    The requested distances are very easy to compute.

    Knowing the focal length f, 120, 135 or 150 mm, and the enlarging magnification M, 6 or 8, the following formulae apply

    lens to image...
  20. Re: Wide angle bellows for Arca Swiss Discovery

    Hello from Besançon, France!

    As you can see on this old Arca Swiss catalog (~ 1990s) there existed two models of wide-angle bellows for F-line 171-171 camera like your Discovery.
    See page 11/21...
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    Re: Arca Swiss F line Metric 4x5"

    Hello from Besançon, France !

    Some additional information regarding weights of 6x9cm and 4x5" Arca Swiss F-classic and F-metric cameras.

    About weights:
    Some information can be found here in...
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    Re: Sinar F2 Vs Sinar Norma (4x5)

    Could this be done on an Arca Swiss ...

    Of course, within the Arca Swiss system, be it a pre-1982 Oschwald system or the current F-line system, you can connect as many rails together as you wish,...
  23. Re: Attaching a filter to Caltar II-N 210mm lens

    Hello from France!

    Would a step-ring add sufficient depth for the filter to clear the lens? Do step-rings come in various depths as well as diameter?

    I faced this problem once in the past and...
  24. Re: Coverage of Schneider Super-Symmar 110mm f5.6 XL at full aperture

    Hello from France!

    The answers to your questions can be found in the official technilcal brochure of the SS-XL-110, it can be dowloaded from here

    Super-Symmar XL Aspheric 5.6/110mm (PDF)...
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    Re: Something I couldn't explain

    I have plotted a schematic layout for a theoretical f/2.8 200 mm Petzval lens, thanks to the free software "oslo-edu" which is supplied with a Petzval demonstration model file.
    oslo-edu can be...
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    Re: Something I couldn't explain

    Hello from France !

    The answer is easy: the Rapid Rectilinear with an overall diameter of about one inch (the US quarter dollar has a diameter of about 24 mm, according to wikipedia, since I do...
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    Re: Help understanding Telephoto lenses

    Hello from France!

    I have uploaded (see below) a diagram explaining how a telephoto works, not a Nikon but a Schneider-Kreuznach "360 mm" (actually f = 353 mm) Tele-Arton.

    For this lens, the...
  28. Re: Calculating f-stop progression . . .how are the numbers derived?

    Hello from France!
    The present f-number system was not standardized when manufacturers started to sell photographic optics.

    See this comparative chart of old f-stop systems

    And after the...
  29. Re: Diy tripod, plans, advice and links to plans please

    from Mark Sawyer
    At my age, I'm wondering whether a balsa wood tripod would work...

    Why not? ;-) The legendary WW-II fighter/bomber De Havilland Mosquito was made of balsa wood!
    (ahem ... and...
  30. Re: Diy tripod, plans, advice and links to plans please

    Anyone made their own wooden tripod for 4x5 camera? Best options for economy of work, strength and stability.

    Hello from France!

    A friend of mine has built for himself a variety of wooden...
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    Re: How Early Could It Have Happened?

    Hello from France!

    Before the official disclosure of the daguerréotype process in 1839, Nicéphore Niépce had experimented with the bitumen process in the 1820s. Dates are not precisely known since...
  32. Re: Thread specification for Klimsch Apo-Ronar 1:9/600mm

    Hello from good ol' Europe!


    Three informations, in short, confirmations of what has already been said here:
    1/ I hereby confirm that the 600 mm Apo Ronat has been sold in the past, mounted on a...
  33. Re: Rodenstock Apo Sironar N or Apo Sironar S 150mm f/5.6

    from Sal Santanamura
    Rodenstock provided MTF graphs for ...

    ... M=1/20 for the N and M = 1/10 for the S and W, at least in the docs I have in my archives. But the objection is unchanged,...
  34. Re: Rodenstock Apo Sironar N or Apo Sironar S 150mm f/5.6

    Hi!

    You'll find here a comparative plot of MTF curves @f/22 and @20 cy/mm for the Apo Sironar N / S / W. Re-plotted from the official manufacturer's data sheet.

    At the center of the field,...
  35. Re: Profisix -luna pro relationship between EV and ISO speed

    Hello from good ol' Europe, Luigi!!

    As strange as it may seem, Exposure Values (EV) are not at all photometric units!

    They are simply a numerical index qualifying all couples (shutter speed -...
  36. Re: What are the options for Arca-Swiss in Europe?

    Otherwise, is it the case that arca-shop.de are the default dealer in Europe?
    Of course not, there are several Arca Swiss authorized dealers in Europe!
    But being a European, you know what the...
  37. Re: What are the options for Arca-Swiss in Europe?

    Hello from Besançon, France !

    I'm living at about 6km / 3.7 miles from Arca Swiss International ;)
    You should contact them directly here by phone and explain your problem.
    People at Arca Swiss...
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    Re: Missing exposure equation

    Hello from France!

    I have always found, for this kind of "photographic" calculations where a 4-digit precision is useless, that a good ol' dedicated analogue slide rule is more useful than any...
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    Re: source of new shutters

    Hi!

    If we are speaking about mechanical leaf shutters, Packard shutters do exist!
    https://packardshutter.com/

    Sure if you need speeds up to 1/60-th, Packard shutters are not what you need....
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    Re: Close up lens, how do they work?

    Good point, Bob, this howerer does not change at all my previous analysys, a cemented doublet is of course much better than a single lens element, since red, green and blue foci of an achromat are...
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