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  1. Re: Looking for a brass 8x10 barrel style lens with either rotating aperture or iris

    There are so many options, it's hard to recommend single examples, but a couple of "typical examples" would be a Euryscop Series IV Number III, or a Darlot Hemispherique Rapide (Rapid Rectilinear)...
  2. Re: Bellows Wax & Wood Polish? Suggestions?

    It's worth remembering that unless there's been some stripping and sanding going on, you're polishing the lacquer, not the wood.
  3. Re: Adjustable Spacing in Jamin Darlot Petzval Lenses

    I just played with mine, and if you unscrew and remove the rear cell, the front tube will push into the rear for use as a landscape lens. But only friction holds it in, and not very well.

    I found...
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    Re: Some Soft Focus Lens Sales Information

    It's not an authentic reproduction unless it has the soft focus adjustment already frozen in place...
  5. Adjustable Spacing in Jamin Darlot Petzval Lenses

    Jamin and Darlot produced for a few years around 1860, a couple of versions of Petzval Portrait Lenses with adjustable spacing between the front and rear group. (Not to be confused with Dallmeyer's...
  6. Re: Which Petzvals have the Dallmeyer modification?

    My Ross No. 3 Cabinet Petzval (serial no. 56993, putting it 1890-95, according to Wilkinson and Glanfield) has the classical layout.

    I've taken to classifying the two layouts by the shape of the...
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    Re: Aerosol varnishing?

    The quickest "varnish" for event-tintypes would be Renaissance Wax, which people were using a few years ago. I don't know how much archival protection it offers... Anyone?
  8. Re: Allowing Lens Availability to Dictate Format Choice

    That would fall under "Allowing Lens Lubricant to Dictate Marital Status". A completely different thread...
  9. Re: Allowing Lens Availability to Dictate Format Choice

    I'm reporting you all to the secret Soft Focus Bureau. Expect a midnight visit from the MIF. (Men In Fuzz.)
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    Re: post "in Galli style"

    Is that the Coke bottle with the adjustable diffusion ring? I want one...
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    Re: post "in Galli style"

    A lovely image, Jim. And still one of my favorite lenses... :)
  12. Re: Allowing Lens Availability to Dictate Format Choice

    Now you're twisting my words in knots...
  13. Re: Allowing Lens Availability to Dictate Format Choice

    There you go. A dirty lens, even if it's clean in the middle, is a poor imitation of the effects of spherical aberration...
  14. Re: Allowing Lens Availability to Dictate Format Choice

    Agreed. Even on the large format forum, about half the folks think of soft focus as "smear some Vaseline on the lens, or put a stocking over it." But then, I wouldn't be surprised if half the...
  15. Re: Know anything about this J.H. Dallmeyer Lens?

    I doubt it's a counterfeit with an iris aperture, that scale progression, the design, and the patina. And there are much more valuable lenses to counterfeit, This one's interesting for the reasons...
  16. Re: Allowing Lens Availability to Dictate Format Choice

    I wish we could still get nitrate film. Then the size of the flaming POOF!!! when we burned our bad negatives could be a factor in our choice too...
  17. Re: Allowing Lens Availability to Dictate Format Choice

    One consideration is that the effect of soft lenses is best seen at the scale of the negative they make. Spherical aberration does not enlarge particularly well. Soft focus also goes especially...
  18. Re: Know anything about this J.H. Dallmeyer Lens?

    From the aperture scale numbers, (which I'm guessing are a non-standardized progression of the standard f/stop scale, but could be the Uniform System or some other scale), I'd say it's a rapid...
  19. Re: Allowing Lens Availability to Dictate Format Choice

    I've always found my choice of format dictated my format choice...

    In wet plate, doubly so...
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    Re: Darlot Rectilinears

    It gave the photographer his choice of four different apertures, one for each lever, or wide open. It was a convenient and reliable arrangement; I've seen a number of the lever-stop Darlots, and...
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    Re: Darlot Rectilinears

    This one will have to be pieced together, most likely from dated catalogs and not-well-dated individual specimens.

    The well-known 1890's Benjamin French & Co. Catalog shows the Darlot Wide Angle...
  22. Re: When did decent wide angles show up? [lens history question]

    Those fall under the "Wide Angle Rectilinear" category. I always likes the Darlots...
  23. Re: When did decent wide angles show up? [lens history question]

    Indeed there are; especially when making any significant enlargement.

    But as an overly-obvious observation, those of us who contact print or use alternative processes can be very happy with much...
  24. Re: When did decent wide angles show up? [lens history question]

    No one has ever lived up to the potential of the worst lens they've ever owned. Not even close...
  25. Re: When did decent wide angles show up? [lens history question]

    The Petzval Orthoscop was designed as a wider-angle "View Lens" along side Petzval's "Portrait Lens" in 1839, but wasn't manufactured until 1856-'58. (Early photographers were mostly interested in...
  26. Re: Help confirming identity of a no name Wollensak lens

    My guess is Versar. That would match the f/6 on the scale; the Ia is an f/6.3. Also, the Ia was a triple convertible, so you could check if the front and rear cells have different focal lengths,...
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    Re: Where to send Lens for CLA?

    Another possibility, for those with Alphax or Betax shutters is https://alphaxbetax.com/. I don't know if they work on other shutters or not.

    The site also has a great deal of information on...
  28. Re: Video of Ansel Adams' Story of Visualization Breakthrough

    Epiphany favors the prepared mind...
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    Re: spherical aberration solved?

    Looks like this single-element correction is already allowing Canon to come up with some very simplified new designs...
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    Re: HELP!!! 14" Veritar problem

    A very small amount of candle/bee's wax on the threads. Don't use oil, as that will haze the inside of the lens over time. Not a big deal as it cleans off, but still... And of course, don't torque...
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    Re: Portraits July 2019

    Minor correction, all tintypes are reversed, and all Ambrotypes IF presented emulsion forward. Ambrotypes with the emulsion at the back are "normal, as are prints from wet plate negatives.

    Picky,...
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    Re: Lens Haze...

    Purple haze, all in my lens,
    Gonna sell it to my eBay friends.
    Don't return it, don't even try,
    I said "as is", that's my alibi...

    Oh great, that's gonna be in my head all night...
  33. Re: Amber Plexiglas for Wet Plate Dork Box?

    Yep, the Rubylith-over-clear-plexiglass was the second choice, but a distant second the more I thought about it.

    I thought about getting one of those spectroscopes, but they probably used...
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    Re: spherical aberration solved?

    The distortion, curved field, chromatic aberration and coma. Zeroing out one aberration at the expense of ignoring others may be an interesting math problem, but not a practical solution to anything.
  35. Re: Amber Plexiglas for Wet Plate Dork Box?

    Thanks, I have some, but I want the structural rigidity of plexiglass. I've put Rubylith and the red plexiglass side-by-side, and they look pretty similar to the eye.
  36. Re: Amber Plexiglas for Wet Plate Dork Box?

    Well, the numbers looked good on paper, but... the 2422 amber plexiglass doesn't work. I guess it's back to the red. Here's average room light through the amber on half a plate for 30 seconds...
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    Re: spherical aberration solved?

    Then they've got chromatic aberration, coma, curved field, and distortion to replace the spherical aberration. Yay...
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    Re: spherical aberration solved?

    For all practical purposes, spherical aberration was eliminated by WWII or earlier. This is sort of like someone saying they've just designed the first apochromatic lens.
  39. Re: Bellows extension math assistance, please

    Why not make it even simpler? An f/stop is a simple ratio, focal length divided by aperture. You're measuring anyways, just measure the focal length and aperture, divide and get your actual f/stop.
  40. Re: I would love to see some photos made with the Cooke XVa

    I also have a Raptar 1a triple convertible, the poor man's Cooke XVa. I suppose if you want the poor man's XV, you could get the uncoated Velostigmat triple convertible...

    The design layouts look...
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