UV, Polarizing filters

Discussion in 'Digital SLR' started by Brion K. Lienhart, Apr 17, 2005.

  1. Are these still worth getting for D-SLRs? I'm pretty sure I can skip all
    the color filters, special effects, etc, but I'm not sure about those 2
    types.
     
    Brion K. Lienhart, Apr 17, 2005
    #1
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  2. Brion K. Lienhart

    Sheldon Guest

    IMHO, especially with a polarizing filter, they will work the same with
    digital as with film. Many people will use a UV or skylight filter just to
    protect the lens, and a polarizing filter can work magic in the right
    situation.
     
    Sheldon, Apr 17, 2005
    #2
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  3. Brion K. Lienhart

    Jeremy Nixon Guest

    You can't Photoshop a polarizing filter.

    There's no difference in the need for a UV filter -- either you want to
    use them to "protect" your lenses or you don't.
     
    Jeremy Nixon, Apr 17, 2005
    #3
  4. I don't want to be too nit picky about this, but let's define what
    everone who says you can't Photoshop a polarizing filter means. If
    you've got a washed out blue sky it's no big deal intensifying that
    sky using layers, using the gadient editor, or using curves and
    masking (keeping the clouds white). Mind you, a polarizing filter will
    save a lot of time and be "real", but.... Ken
     
    Ken Palmateer, Apr 17, 2005
    #4
  5. And one more thing (keeping on track with the original question) I
    tend to put uv filters on all my glass, and do own a few polarizing
    filters which I use on my dsl, but it's a good idea not to stack
    filters. And when I do macro work I take all filters off (looking for
    a particular effect aside).
     
    Ken Palmateer, Apr 17, 2005
    #5
  6. Brion K. Lienhart

    Jeremy Nixon Guest

    You can't duplicate the effect of a polarizing filter in Photoshop. If
    what you want is a darker or bluer sky, you can do that, but that's a
    different thing.
     
    Jeremy Nixon, Apr 17, 2005
    #6
  7. Brion K. Lienhart

    Ed Ruf Guest

    If that's all you use a polarizer for then you can PS it. How are you going
    to deal with specular reflections off surfaces, water, leaves, glass?
     
    Ed Ruf, Apr 17, 2005
    #7
  8. Brion K. Lienhart

    Dirty Harry Guest

    How well do polarizer work with auto white balance? I can't seem to get the
    super blue skies like I used to on film...Would it be better to set the
    white balance with an expo disk(Pringles lid for me) and then put the filter
    on? The benefits for glare are obvious and I don't leave home without my
    polarizer, but to me it just doesn't work as much on the color of the sky as
    it used to with film.
    http://harryphotos.com/waterrock2.jpg - the big rock with the water going
    over it was almost invisible without the polarizer....
     
    Dirty Harry, Apr 17, 2005
    #8
  9. Brion K. Lienhart

    Diane Wilson Guest

    Simple. Don't use auto white balance. Ever. Set the white
    balance for the type of light you're shooting in, and just go
    with it. Daylight white balance will give you about the same
    results that you're used to getting with daylight film.

    If auto white balance could read the color of the *light* that
    you're working in, that would be great. But it can't and
    doesn't; instead, it looks at the color balance of the *image*
    that you shoot. It's probably working against you when you
    try for that super-saturated blue sky. The camera looks at
    all that blue and trys to adjust it *out* of your photo, to
    achieve an "even" color balance by warming up the overall
    white balance. The result is, well, pretty much what you've
    been getting.

    Diane
     
    Diane Wilson, Apr 18, 2005
    #9
  10. Brion K. Lienhart

    John Francis Guest

    I never rely on my DSLR to do all the work for me - that's what
    Photoshop (and the like) are for. But here's one recent shot
    (tweaked to give Velvia levels of saturation):

    <http://panix.com/~johnf/temp/DeathValley.jpg>

    You probably don't want anything bluer than that!

    Here's another shot, this time practically straight from the camera:

    <http://panix.com/~johnf/temp/DesertScape.jpg>
     
    John Francis, Apr 18, 2005
    #10
  11. Brion K. Lienhart

    Chrlz Guest

    As Jeremy stated, polarisers do much more than darken/intensify sky
    colouring. They reduce glare, revealing colours/details that are not
    visible without them, they reduce or eliminate reflections from glass
    windows and other non-metallic reflective surfaces, and of course as
    any fisherperson or ocean photographer knows, they do wonders to reveal
    underwater detail and colour that is lost in glare.

    If you routinely photograph cityscapes, land and seascapes, or even if
    you just shoot outdoors near midday!, they are essential in my opinion.
    No photoshopping comes close!
     
    Chrlz, Apr 18, 2005
    #11
  12. A polorizing filter will remove some glare and reflection. I just
    tested this out up at a lake near home. The clouds could be seen
    reflecting off of the water very clearly, a turn of the filter and they
    disappeared entirely and I could see into the water much better.
     
    Thomas T. Veldhouse, Apr 18, 2005
    #12
  13. I stand corrected, thinking along a rather narrow train of thought as
    far as what a polarizing filter can and can't do. The sky effect is
    just one thing. Reflections can be minimized and scenery can be made
    more intense before Photoshop is applied to the image. So while some
    polarizing effects can be imitated in Photoshop, Photoshop is no
    substitute for a polarizing filter. Ken
     
    Ken Palmateer, Apr 18, 2005
    #13
  14. Brion K. Lienhart

    RichA Guest

    Colour filters, effects filters; How many people give photos
    taken with those things a second-glance? The only one I can
    remember that I ever liked was a Nikon picture from a Nikon ad
    in the early 1980s taken of a dead tree overhanging a near-dry lake
    shot through a yellow filter. The yellow seemed to emphasize the
    power of the sun. Apart from that, using a cross-hatched
    filter to produce "diffraction effects" or those silly Cokin filters
    that tint the sky a different colour from the land just product
    tacky-looking results.
    -Rich
     
    RichA, Apr 18, 2005
    #14
  15. Brion K. Lienhart

    Ken Ellis Guest

    I bought a couple polarizers for my lens (hoya's) They were relatively
    inexpensive and i really like the effect. Oh yeah..use them on 20d
    with canon ef lens.(zzz).

    Regarding colored glass...my two cents are that it depends on your
    creative process.

    rgds
    Ken
     
    Ken Ellis, Apr 18, 2005
    #15
  16. And save masking around that damned tree, don't forget.

    Also the real filter is much better for removing reflections from
    water and such -- in photoshop it's *really hard work* (depending on
    what the reflection is of).
     
    David Dyer-Bennet, Apr 18, 2005
    #16
  17. Brion K. Lienhart

    Alan Browne Guest

    Pol filters go further than that. They reduce the glare from some
    surfaces like glass or wet autumn leaves. That's a harder trick in
    photoshop, if at all possible.

    --
    -- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm
    -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm
    -- slr-systems FAQ project: http://tinyurl.com/6m9aw
    -- [SI] gallery & rulz: http://www.pbase.com/shootin
    -- e-meil: Remove FreeLunch.
     
    Alan Browne, Apr 18, 2005
    #17
  18. Brion K. Lienhart

    Alan Browne Guest

    Anyone with the patience to use a pol will remove the UV filter first.

    --
    -- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm
    -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm
    -- slr-systems FAQ project: http://tinyurl.com/6m9aw
    -- [SI] gallery & rulz: http://www.pbase.com/shootin
    -- e-meil: Remove FreeLunch.
     
    Alan Browne, Apr 18, 2005
    #18
  19. That looks remarkably like the Vegas sands/gravel and the color is way
    gray .... but that might be your desired output.
    The entire picture has a blue tinge to it, even the Joshua trees.
    Still, it is a pretty nice picture.
     
    Thomas T. Veldhouse, Apr 18, 2005
    #19
  20. Brion K. Lienhart

    Alan Browne Guest

    I agree with Diane wholeheartedly. Sun and flash at 5500K, tungsten
    lights at 2800K, flourescents seem to go from about 3500 - 4500 (a bit
    of chimping helps). Shooting open shade leave it at 5500K and add an
    81A filter, or set the light color as high as it will go up to about
    10,000K.

    Cheers,
    Alan


    --
    -- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm
    -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm
    -- slr-systems FAQ project: http://tinyurl.com/6m9aw
    -- [SI] gallery & rulz: http://www.pbase.com/shootin
    -- e-meil: Remove FreeLunch.
     
    Alan Browne, Apr 18, 2005
    #20
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