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Thread: focal distance

  1. #1

    Join Date
    Dec 2007

    focal distance


    Does anybody nows where i Can get some data for Sironar S Lenses.
    Just to get all the distances right. and choose the Right F-stop!!!
    I now there are technical data charts, but where on this internet...
    (Sironar S 210, Sironar S 135, and a 75 N lens)

    Can any body help me

  2. #2

    Join Date
    Jul 2008
    Surrey UK

    Re: focal distance

    I'm not sure if you mean you have the technical charts but are looking foe more ? or you just want to find them online ?

    If the later is the case Sinar lenses for large format PDF and the Rodenstock data tables

    The Rodenstock link is more comprehensive and certainly covers the lenses you mention, all Sinaron models are Sinar branded Rodenstocks.

  3. #3

    Join Date
    Sep 1998

    Re: focal distance

    Or you can ask me 800 735 4373

  4. #4

    Re: focal distance

    I think that you don't really know "how to put the questions". When it comes to Large Format Photo lenses, most of them are about the same. (Yes, the lenses you mention are among the very best ones, but the same basic principles still apply.) There is a section in on the basics of lenses. Do check there.
    Among the basics are: The bellows draw for infinity is about the same as the focal length. (I.e. about 210, 135 and 75mm respectively, in your case.) The usable "image circle" is most often quoted for infinity. "Image circle" is simply the diameter of the sharp image at a given aperture opening (usually f/22) and indicates how much (or little) you can move the lens off axis vs. the film plane.
    A double bellows draw gives you a 1:1 rendition. This will also double the usable image circle.
    The "sweet spot" when it comes to apertures is around the middle of the aperture scale. (f/16 - f/22.)


  5. #5

    Join Date
    Sep 2003
    Massachusetts USA

    Re: focal distance

    Are you looking for a depth of field calculator ?

  6. #6

    Join Date
    Dec 1997
    Baraboo, Wisconsin

    Re: focal distance

    I can't tell exactly what it is you're looking for (focal length, hyperfocal distance, right f stop?) but Rodenstock's U.S. distributor, HP Marketing, will send you a brochure or data sheet if you call or write but last I saw neither they nor Rodenstock published anything on the internet (that was a couple years ago, you might check both web sites to see if this has changed). Paul Butzi has downloaded some of this information on his web site. format
    Brian Ellis
    Before you criticize someone, walk a mile in their shoes. That way when you do criticize them you'll be
    a mile away and you'll have their shoes.

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