Petzval lens, new sample pictures

Discussion in 'Digital Cameras' started by Sandman, Sep 11, 2013.

  1. Sandman

    Sandman Guest

    Sandman, Sep 11, 2013
    #1
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  2. Sandman

    Sandman Guest

    Sandman, Sep 11, 2013
    #2
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  3. Sandman

    Eric Stevens Guest

    Eric Stevens, Sep 11, 2013
    #3
  4. Sandman

    Eric Stevens Guest

    Eric Stevens, Sep 11, 2013
    #4
  5. Sandman

    RichA Guest

    Hopefully, they aren't using a ringer for these shots. Though I'm sure the lenses are pretty much going to be carbon-copies of each other since elements are made on $1M machines designed to duplicate lenses by the thousands.
     
    RichA, Sep 14, 2013
    #5
  6. Gary Eickmeier, Sep 15, 2013
    #6
  7. Sandman

    Sandman Guest

    I am one of them, which is why the quality of the end product concerns
    me. And when the sample pictures aren't as sharp as I would want them to
    be, that's a shame.

    But, I followed up with some other links that were actually sharper.
     
    Sandman, Sep 16, 2013
    #7
  8. Sandman

    David Taylor Guest

    On 16/09/2013 06:15, Sandman wrote:
    []
    Wasn't the whole point of that lens to provide pictures which were /not/
    sharp, at least away from the centre?
     
    David Taylor, Sep 16, 2013
    #8
  9. Sandman

    Sandman Guest

    Absolutely. I'm am talking about it not being as sharp as I would have
    wanted in the center. Like this one:

    http://tinyurl.com/qbpqd4f

    There is no reason I can think of why this couldn't be sharp. It's
    either the photographer or the lens here. The Bokeh is *fantastic* but
    the subject is not anywhere near sharp enough to use for anything but
    novelty. I can accept degrees of blurriness in a feature lens like this,
    but this is over the top.

    That said, some pics taken with the lens look just fine, like this one:

    http://tinyurl.com/ng3dmbx

    It's resized, but you can see the hair on her forehead which means that
    the lens should be able to focus sharpe....ish :)

    We'll see. I'll post about it when it arrives. :)
     
    Sandman, Sep 16, 2013
    #9
  10. Sandman

    Eric Stevens Guest

    W.K. Burton briefly describes the use of the Petzval lens on page 51
    of his "Photographic Optics" (Scovill & Adams Company, 1891). He
    regarded it as but one of several varieties of Portrait Lenses. Of
    these (portrait lenses) he says:

    "This lens can be considered to be in great measure the crowning
    triumph of the photographic optician. It is true that in the
    present day it is of comparitively little use, but this does not
    make the credit of having worked it out when it was a great
    desideratum the less.
    The object in the portrait lens has been to get the greatest
    rapidity possible. Other qualities have certainly to some extent
    been sacrificed to this one of rapidity, but still it is a lens
    wonderfully adapted for the purpose for which it was designed -
    namely, the production of portraits pure and simple of portraits
    pure and simple on films which, according to our modern ideas, were
    very slow. With an enormous aperture, the portrait lens gives
    definition of a very high quality on a small plate. The angle
    included is small - full aperture being used, and fine definition
    being required to the edge of the plate - very small indeed."

    A little later he goes on to say:

    "The lens illustrated here is the Petzval form of portrait
    lens, which was, until quite recently - unless we consider
    Dallmeyer's diffusion of focus lens, to be hereafter described -
    the instrument universally used for portraiture."

    Burton recognised that the lens was not sharp unless used at small
    included angles. I doubt that a modern Petzval lens can do any better
    so there is not much point in hoping for a modern reproduction of a
    Petzval to do any better than it did 130 years ago.
     
    Eric Stevens, Sep 16, 2013
    #10
  11. Sandman

    David Taylor Guest

    On 16/09/2013 09:13, Sandman wrote:
    []
    []

    There looks to me to be (at least) some camera shake in that image - it
    was taken at 1/80 according to the EXIF. These lenses are not image
    stabilised, something many of may take for granted these days. But even
    so, it's not so hot, is it? Might there be sample variation in these
    lenses?
     
    David Taylor, Sep 16, 2013
    #11
  12. Sandman

    Sandman Guest

    There looks to me to be (at least) some camera shake in that image - it
    was taken at 1/80 according to the EXIF.[/QUOTE]

    Indeed, but the blurriness is hardly due only to the shutter speed. But
    then again, the image is unrealistically grainy for ISO 250. I have no
    experience with the Canon 5D and perhaps it produces grainy pics at ISO
    250?
    For a 80mm lens? They do? I don't own a single IS 80~mm lens...
    Maybe. This one was shot on august 27th, so it's a fairly recent sample.
    This is another from the same day:

    http://tinyurl.com/pfzohg5

    1/100, ISO 200, still blurry as hell.
     
    Sandman, Sep 17, 2013
    #12
  13. Sandman

    David Taylor Guest

    Indeed, but the blurriness is hardly due only to the shutter speed. But
    then again, the image is unrealistically grainy for ISO 250. I have no
    experience with the Canon 5D and perhaps it produces grainy pics at ISO
    250?
    For a 80mm lens? They do? I don't own a single IS 80~mm lens...
    Maybe. This one was shot on august 27th, so it's a fairly recent sample.
    This is another from the same day:

    http://tinyurl.com/pfzohg5

    1/100, ISO 200, still blurry as hell.[/QUOTE]

    Let's hope you get the results you expect when yours arrives.

    BTW: most kit lenses these days (18-55 mm DX) have stabilisation, as
    does my 16-85 mm DX and 70-300 mm (used on DX format). The only non-IS
    lenses I have are the 35/1.8 Nikon DX and 10-24 Tamron.
     
    David Taylor, Sep 17, 2013
    #13
  14. Sandman

    Sandman Guest

    Let's hope you get the results you expect when yours arrives.[/QUOTE]

    i do, too! :)
    Indeed. All of those are zoom lenses, where IS is important.
    Which, like the Petzval, is a prime lens. Obviously there are fixed tele
    lenses with IS, but in the <100mm it's not really necessary. Especially
    considering that most lenses in this categories are plenty fast as is.
    Yes, few (if any?) wide zooms have IS. This is true of Nikons high-end
    14-24 wide zoom as well.
     
    Sandman, Sep 17, 2013
    #14
  15. Sandman

    PeterN Guest

    On 9/16/2013 5:57 AM, Eric Stevens wrote:

    The point is to make money for he manufacturer.
    The effect is easily and uncontrollably reproducible with software.
     
    PeterN, Sep 17, 2013
    #15
  16. Sandman

    PeterN Guest

    Some lenses are made to take photographers, not pictures.
     
    PeterN, Sep 17, 2013
    #16
  17. Sandman

    Sandman Guest

    The point is to make money for he manufacturer.[/QUOTE]

    Contrary to what product on planet earth?
    Cool, could you please detail the process you use for the Petzval effect
    in software?
     
    Sandman, Sep 17, 2013
    #17
  18. Sandman

    PeterN Guest

    Contrary to what product on planet earth?
    Cool, could you please detail the process you use for the Petzval effect
    in software?
    [/QUOTE]


    DxO FilmPack Creative Blur.

    Topaz In Focus

    Here is a very rough idea using just a selection, feathering and a
    radial blur. Yes, I know I did not center the sharp area, but I did not
    want to futz with it.
     
    PeterN, Sep 17, 2013
    #18
  19. Sandman

    PeterN Guest

    I forgot the link, and did not have an image of a girl in a rowboat. But
    with some tweaking One can achieve a similar effect.

    <https://dl.dropboxusercontent.com/u/97242118/savanah_0160.jpg>
     
    PeterN, Sep 17, 2013
    #19
  20. Sandman

    Sandman Guest

    I forgot the link, and did not have an image of a girl in a rowboat. But
    with some tweaking One can achieve a similar effect.

    <https://dl.dropboxusercontent.com/u/97242118/savanah_0160.jpg>[/QUOTE]

    Wow. If you think that is a *similar effect* then there is nothing more
    I can say. Enjoy your "easily and uncontrollably reproducible" Petzval
    effect, Peter.
     
    Sandman, Sep 17, 2013
    #20
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