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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,...
  2. 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...
  3. 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)...
  4. Re: What kind of lens bends an image without distortion?

    Hi!

    ... a simple trapezoid with flat faces?

    ... is named: a prism.
    https://en.wikipedia.org/wiki/Prism

    An yes, a prism, working in transmission mode, is able to bend light rays; but...
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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...
  8. 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...
  9. 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...
  10. 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...
  12. 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...
  13. 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,...
  14. 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,...
  15. 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 -...
  16. 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...
  17. 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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    Re: Close up lens, how do they work?

    Hi!

    To understand how a close-up lens works, I prefer thinking in terms of images instead of thinking in terms of changed focal length or modified optical system.

    A close-up lens is a single...
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    Re: Lens for color

    Do you think APO is needed ?

    Hi!
    In the good old days, non-apo and non-coated lenses delivered superb color images!

    http://www.loc.gov/pictures/collection/prok/

    and more recently ......
  23. Re-calibrating an helicoid

    Hello from Good ol' Europe!

    Coming back to the original question of a de-calibrated helical mount, it is easy to estimate the required helical travel that will properly focus to infinity.
    ...
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    Re: Graflex SG service/repair in EU

    Hello from France!

    In France you can contact Laurent de Miollis through his web site
    http://www.speedgraphic.fr/
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    Re: Arca Swiss Lensboard Question

    Just for information, the current list of 110x110 mm F-line recessed lens board reads as follows:
    [date 2020-01-02]
    recessed 15mm, #0 hole, ref. 091001,2

    recessed 7mm, #0 hole, ref. 091004,2
    ...
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    Re: Arca Swiss Lensboard Question

    Hi!

    I have been using Arca Swiss 110 mm F-line lens boards since 19 years now, I have a variety of such boards, flat and recessed, old and new.
    I never had any problem with any of them.
    Boards...
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    Re: Copal 3 Shutter

    Hi!

    Be aware that among Copal shutters, there exist two different models labeled #3 and #3s

    all sizes in mm ___ Copal # : ______ 3s __________ 3
    1/ retaining ring thread _______ M61.0x0.75...
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    Re: Schneider 58mm XL datasheet

    Hi!

    tried for about an hour clicking

    I followed exactly the same route as yours and found the same missing pages, exactly like you, so I was prepared to give-up.
    Then I had the idea to look...
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    Schneider WA XL lenses datasheet - 38 - 47 - 58 - 72 - 90

    Hi!
    FWIW, I recently found this on web.archive.org

    super-angulon_xl_56_38.pdf illumination distorsion transmission - MTF curves


    super-angulon_xl_56_47.pdf illumination distorsion...
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    Re: 8x10 in paris yellow vest violence.

    Hello from France and many thanks to "jp" for finding this ... how to say?
    "weird" video (LF contents is very short and starts at about 0:45)

    The French MF+LF forum ...
  31. Re: Professional Photo Lab anywhere in Europe

    Hello from Besançon, France!

    I'm regularly using the services of the French lab PHOTON PRO located in Toulouse, France.
    http://www.labo-photon.fr

    They do process 8x10" [20x25 cm] film for E6...
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    Re: Greetings from Paris-France

    Welcome here, Michaël!

    You are not the only European member of this group, an not the only Frenchman.

    If you're not acquainted with galerie-photo.com and galerie-photo.info ...
    ... may be you...
  33. Re: Recommendations: Small 135mm with good coverage for 4x5 portraits?

    Hello from good ol' Europe!

    Now that three 3 out of 4 brands of the legendary "Gang of Four LF lens manufacturers" have been recommended, it is time to recommend the 4-th : 135/5.6...
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    Re: Choice for the Circle of Confusion?

    From Neil:
    ...that the circle of confusion should depend on print size. But, I'm uncomfortable with this.

    Hi Neil.
    You should not be uncomfortable with the idea of varying diameters for circles...
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    Re: Choirce for the Circle of Confusion?

    Hi Neil

    Very often, recommendations for the choice of a circle of confusion as found on the Internet come with no justification nor indications of the validity for the recommended value.

    0.033...
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    Re: ROLL CALL

    Hello from France!

    Roll Call started 14 years ago, and 14 years later I'm still here ;)
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    Re: Schneider 135 4.7 xenar coverage

    Good point, Pere. Since I purchased this 2.8-100 Planar alone and not with a Baby-Technika, I do not know if my lens was specially fitted for a certain camera, and I have actually no idea if this...
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    Re: Schneider 135 4.7 xenar coverage

    I've always thought of image circle in terms of....immediately goes black outside of image circle.

    Coming late to the discussion!
    Actually, lens manufacturers' specifications regarding coverage...
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    Re: Greetings from France

    Hello from Besançon, France, Victoria.

    Welcome on board. This is a truly International group with many active Europeans, including French!

    Regarding the 9x12 [cm] camera you inherited, by all...
  40. Re: Any information on Camille Desmoulins lenses?

    https://www.antiq-photo.com/en/collections/museum/technical-books/camille-desmoulins-petit-catalogue/
    You are perfectly right!
    May be the vendor had one for sale in the past, got a good price for...
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