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Thread: difference in heliars

  1. #1

    Join Date
    Apr 2012
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    15

    difference in heliars

    It's been a while but I'm getting back in LF and I'm interested in buying a heliar. Can someone explain the difference between older and newer heliars to me? Should I avoid older heliars? Does it matter? I can't find a lot of information about them other than the fact that people like them and I also like the photos I've seen taken by them.

    Thanks in advance!

  2. #2
    Tracy Storer's Avatar
    Join Date
    Nov 2001
    Location
    Oakland CA
    Posts
    932

    Re: difference in heliars

    Use google site search of this site. Lots of good info already shared.
    Tracy Storer
    Mammoth Camera Company tm
    www.mammothcamera.com

  3. #3
    Tim Sandstrom
    Join Date
    May 2006
    Location
    San Jose, CA
    Posts
    306

    Re: difference in heliars

    thus... google: heliar site:https://www.largeformatphotography.info

  4. #4

    Join Date
    Sep 2017
    Posts
    172

    Re: difference in heliars

    If you find a dead link then check https://archive.org/

    Changes are that it is archived.

  5. #5

    Join Date
    Sep 2003
    Location
    Massachusetts USA
    Posts
    8,446

    Re: difference in heliars

    See A Short History of the Heliar Lenses

    I've never seen anyone do a rigorous Heliar-only study where they shoot an unchanging subject under unchanging conditions and simply change the lens - but having made photos with a few Heliar lenses, I would refer you to our own Christopher Perez's study of out-of-focus rendition of non-Heliar lenses, since the principles are the same.

    See "Out of Focus Rendition Studies" at http://photosketchpad.blogspot.com/

    Here are some questions to keep in mind when comparing:

    Given that a lens renders in-focus areas with adequate sharpness, what happens in front of and behind the plane of sharp focus: are optical aberrations over-corrected or under-corrected ?

    What do under-, over-, and properly corrected aberrations look like ? As we stop down the lens, do the aberrations go away ?

    How far do we have to stop-down a given lens before aberrations are controlled ? Do all lenses behave the same once we reach a certain aperture, or are there some which never lose their aberrations no matter what we do ?

    Do some lenses have controls which let us vary the aberrations, independent of aperture ?

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