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rickfen Jul 15, 2005 1:32 PM

I have an A75 and I purchased a set of inexpensive filters through ebay. The polarizing filter turns and if I understand the working correctly, turning it changes the way it works. However there is no "center" mark so to speak, so I never know where I'm starting from and I can't see a difference in the viewer. Can someone explain this type of filter and now to use it.

TechJD Jul 15, 2005 1:40 PM

you should see a differance
it will cut glare
turn it till glare is the least

note: good test to see if it works is aim it at water with sunshine reflecting
it should cut the reflection

if it doesnt cut any glare then it's just colored glass

rickfen Jul 18, 2005 12:54 PM

I'm heading to the cottage next week - lots of water

TechJD Jul 18, 2005 8:33 PM

ok anothre test I didnt eve nthink of at the time
hold the plo infront of any LCD (watch,display)
and turn it if it gets darker as yo utur nit then it's working
the darker it gets the better it is, total black out is the best

squirl033 Jul 22, 2005 3:53 PM

you can see the result looking at any reflective, non-metallic surface. point the camera with the polarizer on at a reflecting surface and turn the ring. you'll see the reflection disappear, and if you're looking at water, you'll be able to see down into the water, instead of just seeing the light reflected from the surface. thereflection of sunlight on leaves will also disappear when the polarizer is in the proper position.

polarizers are best for reducing reflections from non-metallic surfaces, and for deepening the blue of the sky and making clouds stand out more vividly.they also enhance contrast and color saturation. you will notice a loss of about 1.5 to 2 stops in shutter speed when the polarizer is properly adjusted. it works best when you're aiming the camera at right angles to the direction of the sun, but it offers some benefit at pretty much any angle except straight at the sun.

slipe Jul 22, 2005 10:24 PM

If you have a pair of polarized sunglasses you can make your own marks. With the glasses on and level, rotate the filter in your hand until it turns completely dark. Work it back an forth and try to center the darkest position. Make your marks at the 3 and 9 o'clock positions. You want to start with those marks straight up when you shoot. I find that straight up gives full effect in most situations – probably better than trying to see the difference standing in the sun using the LCD. You might get some slight improvement with a little movement, but not a lot.

bigdawg Jul 23, 2005 3:50 PM

Good way to test and mark the filter, Slipe. Thanks!!


Kurpitsa Aug 14, 2005 2:04 PM

squirl033 wrote:

you can see the result looking at any reflective, non-metallic surface. point the camera with the polarizer --

You say "non-metallic", does this mean that the polarizing filter does not work on metallic reflections? I'm sorry this is probably truly a noob question, i know. Tried googling and only found that it cuts the reflections, and I use my new Canon S2 mainly to shoot car shows and other such events, and those spotlights really ruin many fine shots so I thought of getting a polarizing filter now that I have a camera that supports such addons.But if it doesn't work then what would?

TechJD Aug 14, 2005 3:50 PM

I thought of this thread while I was on my trip
heres an example of what a polarizer can do

[Click Thumbnail for larger Image]

[Click Thumbnail for larger Image]

overkill Aug 14, 2005 6:10 PM

Awesome examples TechJD!

"A picture is worth a thousand words"

Or atleast 6 or 7 posts. :-)

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