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  1. Re: Filter size and thread pitch for Schneider Xenar 150mm f/3.5

    They used slip-on filters back then, and the thread is usually for the front element retaining ring and not meant for accessories. But sometimes you might be lucky and can use the thread.
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    Re: Xenotar condition opinions?

    Ah, yes, I forgot about the "wide open trend" with shallow depth of field and, sometimes, interesting aberrations. I'm so used to stopping down at least a little even if I want a shallow depth of...
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    Re: Xenotar condition opinions?

    Aren't the Xenotar and Planar for large format somewhat overrated? People think Rolleiflex and Hasselblad and hope for the performance many times doubled on large format, so these lenses sell for...
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    Re: Compur shutter questions

    Even though the Compur shutters of this age had size numbers the retaining rings were not always of standard size. The shutters were sometimes made to fit certain lenses and cameras.

    Surely...
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    Re: Compur shutter questions

    True, nor on B.

    Many of them have coated paper aperture leaves, so be careful if you try to clean the shutter.
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    Re: Compur shutter questions

    If it says so. The smaller Compurs 1/250. They are probably a little slower than that by now, but you can still treat them as they are correct.



    Yes, B = Bulb, T = Time. M = Moment. (D = Dauer,...
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    Re: C.P. Goerz Berlin D.R.P. Dogmar Age

    42mm is also a common size for slip-on filters and shades, which is good and should be easy to find. :)
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    Re: C.P. Goerz Berlin D.R.P. Dogmar Age

    What's the outer diameter of the lens in millimeter? It would be interesting to know what size slip-on filters/sun shade fits.
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    Re: C.P. Goerz Berlin D.R.P. Dogmar Age

    Congratulations! The Dogmar is a fine classic lens for black and white, just use a sun shade. I have the 135/6,3 version from 1916 and it's a gem.
  10. Re: A Heliar with an adjustable front group?

    Yes, there are front cell focusing Heliars. The Heliar is a modified triplet after all. You can also find it on the Voigtländer Brillant.

    Cameras with front cell focusing lenses were cheaper to...
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    Re: Are all plasmats convertible?

    Utmärkt test! While most people would agree that the blurry corners make the single lens cells not suitable for landscape, I feel that the optical faults contribute to the image in a positive way,...
  12. Thread: Zoom?

    by J. Patric Dahlen
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    Re: Zoom?

    Google Rietzschel Telinear, it's a lens of the same type.
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    Re: Steinheil Cassar knowledge?

    The Steinheil Cassar is a typical triplet. It is common on folding cameras, both medium and small format.
  14. Re: Ross . London 6in Homocentric 1:6.3 lens

    The Homocentric is a Double-Gauss lens with the front and rear components being symmetrical, hence the name. Similar later designs like the ICA Hekla and Meyer Aristostigmat were tweaked a bit and...
  15. Re: Ross . London 6in Homocentric 1:6.3 lens

    How would you avoid vibrations when you can't attatch a cable release or tube and bulb?
  16. Re: 210 for travel and landscape: Heliar or Schneider?

    Good choice, be happy with the Repro-Claron. I have never used one, but it should be sharp and neutral, good for most things. The Heliar is also a nice allround lens, especially if you want "3D-pop"...
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    Re: Pencil of Rays

    I think sites like that are very much needed. There are lots of people like me who are interested in lenses and want to learn more, like what the purpose is of this or that lens element in classic...
  18. Re: Question about Aperture Scale Compatibility

    And it's not always as easy as measuring the diameter of the front element to calculate the aperture. For example, the Ross Xpres 3,8/105 has a larger front element diameter than the Zeiss Tessar...
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    Re: Carl Zeiss Jena Tessar 150mm f4.5

    Yes, it was made in 1924, and as you can see on the Compur shutter, it came from an ICA camera. The dial-set Compur shutter was used till around 1928, and from then on the rim-set Compur.
  20. Re: Should I return this Dallmeyer Pentac 8" f2.9?

    Autofocus, maybe, and when they write: Autocorrection. They must have bad monitors as well, when they can't see the details like fungus in a lens in the higly enlarged digital photos on the screen.
  21. Re: MF (6x4.5,6x6,6x7,6x9,6x12) B&W film images sharing

    I want to visit that shop and ask about sandblasting.
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    Re: Teach me about Lens Design

    I agree with most of this. And older lens made to be sharp, so not a soft focus lens. I would personally not use shorter focal lengths than meant for the format. Yes, that would introduce...
  23. Re: What's considered "high altitude" when it comes to UV filters?

    I would just use the #15 deep yellow filter. It blocks all UV, cuts through the haze enough to sharpen up the details in the distance and darkens the sky without giving that unnatural look you can...
  24. Re: Bausch & Lomb Planetograph F-8 and "Three Focus" lenses?

    I couldn't find information on the "Three Focus" lens, but it does indeed sound like a triple focus/convertible one, meaning that you can use the complete lens, the front or the back group. If it...
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    Re: Old ICA lens question

    It should have three cemented lens elements in both groups. Is the fungus inside one of those groups, in the balsam between two cemented elements? Yes, upload photos. This is interesting.

    5,4 is...
  26. Re: Steinheil Munchen Orthostigmat 13,5cm

    Yes, and yes. But it doesn't have a separate scale for using the rear lens group.
  27. Re: Steinheil Munchen Orthostigmat 13,5cm

    I have a Steinheil Orthostigmat in Compur from the 1920's and it's a 6,8 lens.
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    Re: Old ICA lens question

    Yes, those are metal blades. Excellent. Most of my Compurs of that style have the paper blades. The risk with a dislodged aperture blade is that it can move about and cause more blades to dislodge....
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    Re: Old ICA lens question

    It should be an easy fix for a repariman. It's a good idea to tell that person that this version of Compur has the delicate paper aperture blades so he doesn't try to dip the whole shutter in a...
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    Re: Old ICA lens question

    Yes, it's a problem. The pivot pin of one of the aperture blades had become dislodged from its hole. The aperture blades in this shutter are made of treated paper and are easily damaged.
  31. Re: Weird, Odd, and Unlikely Lenses - Recommendations Please

    That place is considered evil by some, comparable to a certain software company or the name of a scottish play one should never say in a theatre.



    And that too!
  32. Re: Weird, Odd, and Unlikely Lenses - Recommendations Please

    You can find achromats in different focal lengths on a certain auction site.
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    Re: Urgent lens understandings needed

    It certainly does. It was the shape of the ejecta from the craters that looked like the web like pattern that fungus produces. When I scrolled down further it became clear that it wasn't fungus, but...
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    Re: Urgent lens understandings needed

    Pere Casals, when I scrolled down and saw the first inch of the Moon photo I thought "Man, that's a bad case of fungus".
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    Re: Schneider Lexar lens?

    I got a reply from Schneider: "Lexar" was a brand name owned by Nagel, and in the Schneider records it's only called "Nagel-Anastigmat" and is a lens very similar to their own Xenar. That cleared it...
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    Re: Can the search system be improved?

    Thanks for the tip! Not perfect, but it does make it easier to find posts that you know are "hidden" somewhere in the threads. :)
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    Re: Can the search system be improved?

    I often start with Google for the search to begin with, by typing in the name of the lens and do an image search. I can, for example, type in "Eurynar" and in the search results I might see a...
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    Can the search system be improved?

    I find it extremely annoying when I search for, for example, the name of a certain lens, and the result I get is a list of topics. Some of the topics have tens and sometimes hundreds of pages, so to...
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    Re: Schneider Lexar lens?

    No, it says "Lexar" clearly on the lens. Here's the auction for the camera: https://www.ebay.de/itm/382448849067
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    Re: Schneider Lexar lens?

    The name Isconar/Jsconar was used long before that. Joseph Schneider & Co -nar.
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