The best polerizer
Author:
rose
03 14th, 2010 in
enart.abczj.com
edit
I plan on getting a circular, but i was wondering if i should get a normal one, or a warming circular polarizer? Also is multi coating that much better?
Thanks for the help
Edit: Sorry for the typo in the title
Scott
Scott
As to whether you should get a circular or a linear polarizer depends on the camera you have. Some cameras' AF or AE systems are thrown off by linears, so you would need to use a circular. If you have a manual-focus camera then a linear should work just fine. The visual effect caused by both is exactly the same. The only difference is the price and the ability to function with certain AF / AE systems.
And the question about getting a warming polarizer is pretty much up to your personal taste. Do you often want warmer images? Personally when buying something as expensive as a 72mm circ. polarizer, I wouldn't want it to always act as a warming filter, so I opted for a ND polarizer.
Has anybody ever herd of Tiffen Filters? are they any good?
I find they have a lot of good deals on some products
The pictures I've used it on have been done at home just as "tests"
What is the difference between coated and non-coated. Meaning, does it make that much difference, and is it really important?
Well, if the manual says that, then I would assume it definitely throws off at least one of the two. See below for more detail.
For some reason i doubt it would throw off the AE, logically the camera should just see a darker image and compensate, but i am no perfesional in regards to filters.
This is not necessarily true. The way it works is this. Some cameras use what are called beam-splitters to measure focus and exposure. I'm not sure exactly how beam-splitting works, but essentially it means that the camera itself also polarizes the light coming to its AF/AE sensor. If the lens filter is polarizing light in a direction perpendicular to the direction that the sensor is*, then the two cancel each other out, and the sensor essentially sees no light coming through, resulting in an inaccurate reading that would generate an overexposed image. On the other hand, if the polarizer were oriented parallel to the sensor's beam splitter, then the proper amount of light would pass through, resulting in a relatively accurate exposure. If the filter is anywhere between parallel and perpendicular, the amount of light getting through will theoretically vary between 0% and 100%. This means that you can't easily predict how much to compensate for if your camera's metering system is thrown off by a linear polarizer.
To the best of my understanding, what circular polarizers do to correct this is they essentially un-polarize (scatter) the light once it has travelled through the polarizing part of the filter, meaning that the beam-splitting sensor will always receive the same amount of light regardless of what angle of polarization the filter makes.
*If you're not familiar with exactly what polarization is, then google will provide you with some good pages for understanding it:
http://www.google.com/search?q=polarization
The pictures I've used it on have been done at home just as "tests"
As I said, the only difference between circular and linear is the ability to not throw off certain Autofocus and Auto-exposure systems. Linear polarizers only cause problems with some cameras, and may or may not have an effect on the E500. If it works, then it works. If you are having no problems with it on your E500, then it seems linears work just fine with it.
As to whether it works under certain circumstances: the amont the AE system is thrown off in the case that your camera indeed is affected by linears depends on the angle to which the polarizer is rotated. Read my post above. As for AF systems, I would imagine it works in a similar way, meaning that if the polarization is parallel to the AF's beam splitter, then it would work, but if it's perpendicular then it wouldn't work.
Another option is to get a Circular Polarizer that fits your largest lens and get step-up rings to fit it to any other lenses you may have.
What is the difference between coated and non-coated. Meaning, does it make that much difference, and is it really important?
Coating on any kind of filter is mostly to reduce glare and lens flare. It might also help provide a protective layer on the filter. Coating is a nice thing to have, and multi-coating even better, but neither are really important or necessary. Here's (http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=00EVJq&tag=) a thread over at photo.net that goes into more detail.
You may experience some vignetting with a wide lens when you have to many filters stacked though.
As for whats best, I am wondering that myself since I am in the market.
That link Unimaxium posted was very helpfull, thank you.
Speaking of the filters throwing off the AF or AE...I noticed last night as I was going through my D50 manual that it says "the D50 cannot be used with linear polarizing filters. Use the C-PL circular polarizing filter instead." Is there anyway to tewll if this will throw off the AE or the AF? I dont use the AF much, so Im not worried if it gets thrown off. However, the AE i cant afford to lose. Unless it is a consitant error. I think I would be able to compensate for it after testing several exposures. Has anyone epreienced this? Is it very minute, or will it be very far off?
For some reason i doubt it would throw off the AE, logically the camera should just see a darker image and compensate, but i am no perfesional in regards to filters.
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