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  1. 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.
  2. 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...
  4. 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.
  5. 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.
  6. 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...
  7. 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
  8. 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...
  9. Re: Voigtlander (Pre Euriscope) "A." engraving

    My “guess” is still a slow Petzval! Even though it doesn’t make sense on a 13x18cm camera!
    I think the WHS is off-center in the barrel - but not by much, which is characteristic of the Voigtlander...
  10. Re: Voigtlander (Pre Euriscope) "A." engraving

    This is definitely a small Petzval. “A” has been used from at least the 1864 catalogue. There were also B and C Petzvals.
    In 1864, the focal length of the A was 159mm and the front lens/rear lenses...
  11. Re: Voigtlander (Pre Euriscope) "A." engraving

    I will check the corrado book tomorrow as the A may Indicate a Petzval rather than an early Euryskop.
    Certainly the serial no. is OK for these unmarked aplanats, but most at this time were “C”s or...
  12. Re: Instrument makers Kemp & Co. from Edinburgh - any info?

    I didn’t know about Kemp & Co. But they Seem to have been quite succesful - almost parallel with the other scottish Company, Lizars. But they specialised as suppliers to hospitals, rather than the...
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    Re: Hermagis image size

    But there isn’t a direct answer there!
    The Hermagis booklet is number 5 in the series and is not quite so useful as some of the later releases.

    The data for the series I no.5 is given as follows:...
  14. Re: Dallmeyer Triple Achromatic Lens F3.5 Question

    No Way this is a Lens which can be used at F.3.5.
    Look at the range on the Aperture scale - doesN ‘t look right does it?
    Universal use of The modern F scale came after 1900.
    Search for Old...
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    Re: Camera ID help/shutter question

    This is a Nice travel camera of size 13x18cm - not 5x7”!
    The thornton-pickard type shutter is designed to Provide both instantaneous AND time Alternatives. Check for Simple adjustment at the...
  16. Re: Any picture examples of color film with old lenses?

    I would have thought that the best way to check the colour rendition of specific uncoated lenses is to eliminate film in the first instance.
    By setting up a test optical bed, with digital...
  17. Re: Any picture examples of color film with old lenses?

    Do you have the serial number of the Cooke Series IIE?

    After WW2, these were all coated by the factory!
  18. Re: 14x17 Tessar Series IIb worth fixing?

    This has a focal length of just under 20”.
    This was sold as a process lens. The F.6.3 Tessars of all makes are the better lenses. Krauss of Paris made an awful lot of the metric version of this lens...
  19. Re: Bausch & Lomb Planetograph F-8 and "Three Focus" lenses?

    There is a well known reprint of the 1898 ROC which I own.
    By 1898 they were only up to model no. 5, unfortunately! ROC was soon taken over by Eastman, but the ROC name was continued until 1907. In...
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    Re: DIY "classic" 8x10 field camera

    Nothing but praise from me!

    I recall the problem of having a good source of prime Wood, but baulking at the problem of excessive waste!
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    Re: Fungus on antique Lens: Can it be fixed?

    Engraving styles mean Little with Darlot. The same applies to serial Numbers - there are either Numbers/no numbers relating to design or many restarts.

    You are misled by the simple...
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    Re: Fungus on antique Lens: Can it be fixed?

    The quoted article matches my experience.
    Most RRs/aplanats do have these Quick mountings. They are not designed for servicing. Advances in Optics at the time (1890’s) meant most makers were...
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    Re: Fungus on antique Lens: Can it be fixed?

    Sorry, but there is a good deal of hearsay and misleading (wrong!) information here already!
    There are a number of lengthy thread on balsam replacement in the DIY section.

    - Don’t use...
  24. Re: Help with a 13" Cooke series II missing a screw

    I think this is the earlier version.
  25. Re: Help with a 13" Cooke series II missing a screw

    Found my dismantled 10.4” Series II - exactly where I left it!
    It is a simple Locking screw which screws into a thread in the Inner barrel. When it is installed, the “sharp” is exactly opposite the...
  26. Re: Help with a 13" Cooke series II missing a screw

    I think it may be the reverse!

    I have seen a few Cooke lenses with extra locking screws which seizes the soft focus adjustment in a particular setting - probably sharp.
    Most of these lenses...
  27. Re: Taylor-Hobson Cooke Series II Portrait Anastigmat 12.75" F/4.5 lens query

    The repair is basically - screw apart, find the steel Ball, clean all surfaces, lightly Oil the contact surfaces , replace the Ball and screw back together.
    Perhaps an hour’s light work.

    Here is...
  28. Re: Adapting a plate camera to take smaller plate holders

    Of course you CAN do what you are illustrating.

    But inserts are traditionally the easiest and most satisfactory Method _ especialy if youhave a tendancy to CHANGE formats!
  29. Re: Taylor-Hobson Cooke Series II Portrait Anastigmat 12.75" F/4.5 lens query

    No.
    These lens deserve a proper clean - solvents will move grime elsewhere.

    I think Ron’s advice is great if you are not confident about the servicing. The lens is very attractive as most on...
  30. Re: Taylor-Hobson Cooke Series II Portrait Anastigmat 12.75" F/4.5 lens query

    Yes, the problem is solidified grease. Can only be Solved by mechanical removal. There is a small Ball bearing which allows the rotation to stop in the 1 - 5 positions. Don’t loose it.
  31. Re: Taylor-Hobson Cooke Series II Portrait Anastigmat 12.75" F/4.5 lens query

    This is an Easy service and is illustrated here in a number of threads!
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    Re: Dating Derogy lens

    There is a lot of variation in Derogy engravings - text, language and depth of engraving.
    I have checked the “le Reve edition” booklet for a similar engraving, without success! But my post #3 shows...
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    Re: Suter serial numbers and dates.

    I believe I have asserted that the Stella series is basically a continuation of the F.5 Rapid Aplanat series.
    I am pretty sure this is not the case!
    Not only do the sizes of the Stella not match...
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    Re: Any info. on Suter lenses

    I have always assumed that the Stella is a rebadged Rapid Aplanet (F5) with Jens glass - as the offered focal lengths were an exact match.

    There is a 42 and a 50cm in the catalogue. I can see that...
  35. Re: Steinheil Munchen Orthostigmat 13,5cm

    isn't it this?

    https://www.largeformatphotography.info/forum/showthread.php?111722-Need-help-Steinheil-Orthostigmat-convertible
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    Re: Petzval in shutter

    There are plenty of Thornton-pickard (T-P) curtain front mounted shutters available which would (and did!) work well with smaller Petzvals.
    The mechanism is simple, robust and suited to DIY repairs....
  37. Re: Iron ring on brass lens - possible to get off?

    Remove lens cells.
    Check aperture leaves are metallic!
    Use propane flame to heat the end with the iron/steel ring up.
    Let the brass assembly fall out due to gravity when the solder is molten-...
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    Re: Old ICA lens question

    I am guessing that the F5.4 is a Goerz Scale rendering of F6.8! F.5.4 is pretty hard to achieve without air spaces in lens cells, which the OP hasn’t mentioned.
    120mm is pretty long for a 6x9...
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    Re: Old ICA lens question

    Yes, this is a F6.8 DAGOR or Zeiss protar clone ( ICA included Zeiss’ camera division!). Note the two mounting lugs on the shutter edge - it has been mounted in a quick release lens board fitting.
    ...
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    Re: Old ICA lens question

    Fungus is very unlikely for a non coated lens of this era.

    Is this mounted in a Compound shutter?

    Focal length?

    Have you considered that the "f.5.4" could be the German/Goerz f scale. I have...
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