WA Polarizers

gusgus Registered Users Posts: 16,209 Major grins
edited September 26, 2005 in Accessories
MuskyDude wrote:
Thanks Gus, and yes I did use a polarizer on it. 18-70 DX @ 29mm, A mode f4.


AJ
Hmmm...am looking buying one for my 10-22 & one for my 400. Our light here is very strong & i often cannot get the sky as it is.

Tks.

Comments

  • DavidTODavidTO Registered Users, Retired Mod Posts: 19,160 Major grins
    edited September 17, 2005
    Humungus wrote:
    Hmmm...am looking buying one for my 10-22 & one for my 400. Our light here is very strong & i often cannot get the sky as it is.

    Tks.

    You have to be really careful with polarizers on wide lenses, since the polarity of light changes across the sky, you can end up with shots like this one, where the polarization changes across the image:

    34051568-M-1.jpg

    It CAN work right, but it'll fail more often than narrower lenses.
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  • gusgus Registered Users Posts: 16,209 Major grins
    edited September 17, 2005
    DavidTO wrote:
    You have to be really careful with polarizers on wide lenses, since the polarity of light changes across the sky, you can end up with shots like this one, where the polarization changes across the image:



    It CAN work right, but it'll fail more often than narrower lenses.
    ...tks for that. Its the same diameter as my 400 so i will try it on both.
  • DavidTODavidTO Registered Users, Retired Mod Posts: 19,160 Major grins
    edited September 17, 2005
    Humungus wrote:
    ...tks for that. Its the same diameter as my 400 so i will try it on both.

    Don't let it stop you, Gus, just wanted to point it out to you.

    Read more about it here.
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  • thdizzythdizzy Registered Users Posts: 262 Major grins
    edited September 17, 2005
    DavidTO wrote:
    You have to be really careful with polarizers on wide lenses, since the polarity of light changes across the sky, you can end up with shots like this one, where the polarization changes across the image:

    It CAN work right, but it'll fail more often than narrower lenses.
    David - 2 questions relating to the fact that I just bought the new Tonkina 12-24.

    1. Is there any way to avoid the 'blue circle' seen in your image and in my image below -
    35388037-L.jpg

    2. Will vari-ND filters (Sing-Ray with Cokin P series holder, just ordered) also give me problems when capturing wide?

    Thanks in advance for your reply.
    Todd Disraeli - Star, Idaho

    Disraeli Photography

    "Only when the last tree has died, the last river poisoned, and the last fish been caught will we realize we cannot eat money" Cree Indian Proverb
  • DavidTODavidTO Registered Users, Retired Mod Posts: 19,160 Major grins
    edited September 18, 2005
    thdizzy wrote:
    David - 2 questions relating to the fact that I just bought the new Tonkina 12-24.

    1. Is there any way to avoid the 'blue circle' seen in your image and in my image below -
    35388037-L.jpg

    2. Will vari-ND filters (Sing-Ray with Cokin P series holder, just ordered) also give me problems when capturing wide?

    Thanks in advance for your reply.


    Maybe a mod can split this off so we don't hijack the thread...

    My understanding of polarizing filters is that they are most effective with shooting the sky at an angle 90 degrees from the sun. In other words, they are least effective looking at or away from the sun. But when you're shooting across it, the polarizing filter is most effective. The problem with wide angle lenses is that they cover such a wide area of the sky that these differences become very apparent. That's all I know. Maybe someone else can chime in with a more technical explanation that could help you. But I think it's just something that you have to live with when polarizing wide angle shots of the sky.
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  • ian408ian408 Administrators Posts: 21,938 moderator
    edited September 18, 2005
    Split
    I split to give the topic of Polarizers on WA a bit more exposure.

    Ian
    Moderator Journeys/Sports/Big Picture :: Need some help with dgrin?
  • pmccurdypmccurdy Registered Users Posts: 37 Big grins
    edited September 18, 2005
    Location?
    Where is that picture taken, Todd. That's a spectacular landscape!

    Patrick
  • ian408ian408 Administrators Posts: 21,938 moderator
    edited September 18, 2005
    pmccurdy wrote:
    Where is that picture taken, Todd. That's a spectacular landscape!

    Patrick

    I think it's from the White Mountains looking towards the Eastern Sierras.

    Ian
    Moderator Journeys/Sports/Big Picture :: Need some help with dgrin?
  • thdizzythdizzy Registered Users Posts: 262 Major grins
    edited September 18, 2005
    pmccurdy wrote:
    Where is that picture taken, Todd. That's a spectacular landscape!

    Patrick
    Ian is right.

    I captured that image in the White Mts. an hour or so after sunrise. I am at 10,000 ft. looking West towards the Sierras.
    Todd Disraeli - Star, Idaho

    Disraeli Photography

    "Only when the last tree has died, the last river poisoned, and the last fish been caught will we realize we cannot eat money" Cree Indian Proverb
  • gluwatergluwater Registered Users Posts: 3,599 Major grins
    edited September 19, 2005
    David_S85 gives a good explanation of Circ Polerizers in[thread=15591]this thread[/thread]. Hope it helps.
    Nick
    SmugMug Technical Account Manager
    Travel = good. Woo, shooting!
    nickwphoto
  • gusgus Registered Users Posts: 16,209 Major grins
    edited September 20, 2005
    gluwater wrote:
    David_S85 gives a good explanation of Circ Polerizers in[thread=15591]this thread[/thread]. Hope it helps.
    Thanks glu...i will certainly have a look.

    Gus
  • gusgus Registered Users Posts: 16,209 Major grins
    edited September 23, 2005
    Ok...got my 1st polariser today (gubbs shouldnt we be spelling that with a Z ?)

    Off to the rain forest tomorrow to see what greens & blues i can get.

    Will you lot please stop helping me find ways to spend $ !!!

    Gus
  • ridetwistyroadsridetwistyroads Registered Users Posts: 526 Major grins
    edited September 26, 2005
    what about using two CP's to widen the angles they can block light from? Anyone try this?
    "There is a place for me somewhere, where I can write and speak much as I think, and make it pay for my living and some besides. Just where this place is I have small idea now, but I am going to find it" Carl Sandburg
  • David_S85David_S85 Administrators Posts: 13,245 moderator
    edited September 26, 2005
    what about using two CP's to widen the angles they can block light from? Anyone try this?
    Two polarizers cancel each other out, making it appear that no filter was applied. All you'll get is more vignetting, and more lens distortion from the additional 4 layers of glass. mwink.gif
    My Smugmug
    "You miss 100% of the shots you don't take" - Wayne Gretzky
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