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    Re: Xenar 180 / 4.5 Aperture position

    "distance diaphragme" is the distance between the element in front of the diaphragm and the diaphragm. I'm not sure where it is measured from, ask Eric.

    The contact link on his site doesn't...
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    Re: Xenar 180 / 4.5 Aperture position

    There are some f/4.5 Xenar presciptions here http://www.dioptrique.info/base/n/n_xenar.HTM, all scaled for 100 mm. Multiply all dimensions including radii by 1.8 to rescale for 180 mm.
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    Re: Still life - DOF problem

    That's how the calculations come out. Do them.

    Oh, and by the way, one third of infinity is infinity.
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    Re: Still life - DOF problem

    Bob, the 1/3d rule doesn't apply close up. It also doesn't apply at infinity.
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    Re: Still life - DOF problem

    You seem to have focused on the frame. At the magnification you're working at, DOF is roughly (got that, folks, roughly) symmetrical about the plane of best focus. Try focusing midway between the...
  6. Thread: Spot meter

    by Dan Fromm
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    Re: Spot meter

    Cual fotometros tiene?
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    Re: Compatible lens boards

    Cambo. If you buy a lens on a foul alien unclean board, you'll have to buy a Cambo board, appropriately bored, for it. Used boards that fit the SC-2, SF, Legend, ... are abundant and not that...
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    Re: Better lens for my Crown Graphic?

    You seem to want more sharpness than's needed for reproduction in a newspaper.
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    Re: Reading a Luna-Pro

    The Luna Pro is a Lunasix 3 rebadged for the US market. Manual here: https://www.butkus.org/chinon/flashes_meters/lunasix3/lunasix3-splash.htm
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    Re: Better lens for my Crown Graphic?

    Um, er, ah, the cams are measured focal length-specific. Focal lengths engraved on lenses' trim rings or barrels are marketing focal lengths, are rarely equal to the lenses' actual focal lengths as...
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    Re: 75mm or 90mm based on the following....

    If you're referring to your camera -- the post I'm quoting is the first mention of Cambo in this discussion -- you may have assembled it incorrectly. See: ...
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    Re: A tale of two meters

    Spot meter sees a very narrow angle. LunaSix Pro-F sees a wide angle. Unless you compare their reflected readings from a very large very uniformly illustrated wall they'll disagree. Why are you...
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    Re: 75mm or 90mm based on the following....

    If you get a lens shorter than 90 mm you'll need a center filter. CFs and step rings don't get along. There are few CFs with 67 mm front threads, if you shop for one shop carefully.

    I agree with...
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    Re: Linhof 240mm Tele-Xenar Reviews

    Jimbo, when you refer to something found on line, please include a link to it. Share. By the way, a 240 mm telephoto lens that covers 252 mm is quite a rare and wonderful thing. Schneider sold the...
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    Re: Linhof 240mm Tele-Xenar Reviews

    Greg, you may have made a lookup error, or perhaps the catalog is mistaken. I just looked at the 1956 Schneider tele lenses brochure. It recommends the 240/5.5 for 90 x 120 mm, the metric...
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    Re: My hyper-confused self and the f-stop

    If that's what you wanted to know, you should have asked the question directly instead of raving at us. Please try to be more direct.

    To answer your question, long lenses look brighter off-axis...
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    Re: My hyper-confused self and the f-stop

    Benno, why don't you just get to the point and ask how best to meter?
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    Re: explain like I'm 5......... 90mm lenses

    Alan, short answer, read this: http://www.galerie-photo.com/center-filters-for-large-format-lenses.html. Your 77 mm filters are too small for most CFs for 75 and 90 mm lenses, but it depends on the...
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    Re: Linhof 240mm Tele-Xenar Reviews

    Jimbo, you have the lens and you know what you like and don't like. None of us has your lens and none of us knows your preferences. Ask the lens whether it pleases you.
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    Re: Ilex No. 3 Universal Shutter ?

    Hmm. Much of my stuff isn't cool.
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    Re: explain like I'm 5......... 90mm lenses

    Jeff, PMFJI. There's a link to my article on center filters in post #39 above. Until someone writes a better one it is definitive. Read it.

    To answer your question, they're all functionally...
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    Re: explain like I'm 5......... 90mm lenses

    Benno, do you know who Ring Lardner was? If you don't, look him up and look up his book You Know Me, Al. There's a great classic line in the book. "Shut up, he explained."

    So, shut up and...
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    Re: explain like I'm 5......... 90mm lenses

    Joseph, optical vignetting (the dread cos^4) afflects all lenses equally. There've been many discussions about when a center filter is necessary. To the extent that there's a consensus, it is that...
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    Re: explain like I'm 5......... 90mm lenses

    Look for 90/14 Perigraphes and you will find. I just checked on ebay.com, 12 on offer. There should be others on ebay.fr.
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    Re: A question on FS rule enforcement

    No, but young men still have to register with Selective Service.
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    Re: A question on FS rule enforcement

    Exactly. May I address you as he/she/it?
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    Re: A question on FS rule enforcement

    Brian, how can I be sure what sex you are? You could be anything hiding behind a screen name. So could I. Please certify that you're, human, male, and show ID sufficient to let you board a...
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    Re: explain like I'm 5......... 90mm lenses

    Hmm. Randy, if you want tiny, you want a 90/14 Perigraphe VIa. Compared to it the 90/6.8ers are monstrous. However, the Perigraphe is in barrel. Stuffed into the front of an Ilex #3 -- that's how...
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    Re: A question on FS rule enforcement

    Jonathan, if that's your name, I have no idea whether you're male or female. This because screen names aren't required to be their owners' real names. You could be male, you could be female, you...
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    Re: A question on FS rule enforcement

    Out of curiosity, I looked up the OP's posts here. If I counted correctly, 109 of the last 120 (starting May 8, 2016) were for sale offers or complaints about the for sale section's rules. Several...
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    Re: A question on FS rule enforcement

    Sal, some people don't see it that way, but curmudgeonliness is a noble calling.
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    Re: A question on FS rule enforcement

    Agree completely with Peter.

    Jonathan's statement in post #41 above reveals his values. I don't share them.
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    Re: Ilex No. 3 Universal Shutter ?

    Um, some tachistoscopes used Alphax #3 shutters.
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    Re: Ilex No. 3 Universal Shutter ?

    It is from a tachistoscope. Used to project images for a short time. Used for teaching aircraft recognition, speed reading exercises, ... The piece of glass in front is a dust cover.
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    Re: explain like I'm 5......... 90mm lenses

    Jes' plain Angulons have less coverage than modern wasp-waisted w/a lenses of the same focal length. By the way, there's also a 90/6.8 Raptar, different design than the jes' plain Angulon, same...
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    Re: Schneider filter size

    Alan, the first post in this https://www.largeformatphotography.info/forum/showthread.php?138978-Where-to-look-for-information-on-LF-(mainly)-lenses discussion has a link to a list of links to...
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    Re: Schneider filter size

    The brochure says M49x0.75.
  38. Re: Physical information about Schneider 47mm Super Angulon XL

    https://web.archive.org/web/19970618120946/http://www.schneideroptics.com/large/super_angulon/xl47/daten.html

    You have to be a bit persistent when looking for Schneider info saved with...
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    Re: 8x10 Portrait Lenses

    The Acutar is essentially a Commercial Ektar. Given a choice between the two, buy on price and condition.
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    Re: Swapping the pinhole with a lens

    Laci, you floated this idea on photrio.com.

    Short answer, you need a camera back with a ground glass in register with the film plane. You don't have to use the GG when shooting, but you need to...
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