flower-petal lens hoods...advantage?

Discussion in '35mm Cameras' started by Jim Waggener, Jan 17, 2004.

  1. Jim Waggener

    Jim Waggener Guest

    What are the advantages of a flower-petal type lens hood over traditional
    round ones?
    Why were they designed that way?

    Thanks,
    Jim
     
    Jim Waggener, Jan 17, 2004
    #1
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  2. Jim Waggener

    adelphia Guest

    It gives you maximum horizontal and vertical shading since it can be longer
    on the top and bottom side because of the shape of the negative or ccd. In
    square format round gives you the same shading all around the frame.

    Mark
     
    adelphia, Jan 17, 2004
    #2
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  3. Jim Waggener

    Skip M Guest

    Flower petal hoods, or tulip hoods as I've heard them called, are for zoom
    lenses, generally wide angle to normal or tele zooms. They are a compromise
    between having a hood that gives good protection on the long end of the
    zoom, but vignettes on the wide end and one that doesn't vignette, but
    doesn't give enough protection on the long end. Because of the rectangular
    shape of the film or sensor, the corners are the most susceptible to
    vignetting, so the corners are pretty much cut away.
     
    Skip M, Jan 17, 2004
    #3
  4. Jim Waggener

    Bruce Murphy Guest

    I've got a petal hood on non-zoom lenses.

    To avoid vignetting, assuming you've got the biggest possible petal
    hood, you would have to cut the hood back so it's a flat traditional
    hood and it would come no further out than the biggest cut-in on the
    hood.

    Thus all the extra coverage is free! Of course, what you also lose is
    the ability to have nice robust screw-in metal hoods too.

    B>
     
    Bruce Murphy, Jan 17, 2004
    #4
  5. Jim Waggener

    Skip M Guest

    If I'd stopped to think about it, so do I, on wide angles. My Sigma 15mm
    fisheye has one, and so do the Canon wide non zooms.
     
    Skip M, Jan 17, 2004
    #5
  6. Jim Waggener

    Mark M Guest

    It's not just for zooms though...
    ....If you just take your last sentence and snip the rest, that's really all
    there is to it, IMHO.
     
    Mark M, Jan 17, 2004
    #6
  7. Jim Waggener

    Mark M Guest

    Hey Skip...I didn't see your follow-up.
    :)
    You got it already...
     
    Mark M, Jan 17, 2004
    #7
  8. Jim Waggener

    Skip M Guest

    Yup...<G>
     
    Skip M, Jan 18, 2004
    #8
  9. Jim Waggener

    Matt Clara Guest

    In much the way features in the natural world evolve, so too did the
    flower-petal lens hood, and for similar reasons. In the case of natural
    features, survival of the fittest is the rule. In the case of camera gear,
    selling the most units is the rule. The funky-flower shape attracts
    photographers, mouths agape, like the flower itself attracts honeybees; thus
    the flower-petal lens hood is uniquely poised to reproduce in terms of other
    units being made and sold.

    Also, flower petal lens hoods keep wide-angle lenses from darkening at the
    corners due to vignetting.
     
    Matt Clara, Jan 19, 2004
    #9
  10. Jim Waggener

    Bandicoot Guest

    I wonder if more would sell if they nectar guides, visible only in the UV
    range, printed on them...

    ;-)


    Peter
     
    Bandicoot, Jan 20, 2004
    #10
  11. Jim Waggener

    Vin Guest

    The standard conical Hoods would give you the best results
    if you had a round sensor or film (wouln't that be fun?).
    A Petal Hood would compensate for the areas that are straight
    on the film. Since they are closer to the centre of the film
    than the edges, there is less chace of it vignetting.

    Vin.
     
    Vin, Jan 20, 2004
    #11
  12. Jim Waggener

    Bruce Murphy Guest

    There is no 'chance' of it vignetting. The petal hood is what you get
    if you have a tube and then cut away all the parts which would be
    touched by the projection of the film. The parts that are left
    /cannot/ contribute to direct image formation unless you're using the
    wrong hood or if it's crooked.

    B>
     
    Bruce Murphy, Jan 20, 2004
    #12
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