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The Use of A Polarizing Filter by Roberto Bell

There are several kinds of filters available which serve different objectives aimed to enhance the effect of the photographs. There is a particular filter that you must have in your camera kit, and that is the polarizing filter.

Have you ever ponder how do some of the photographs from postcards, travel images are able to project a very nice enchanting blue sky? How did the photographers cut down the reflections on the subjects? The answer to this lies in the use of a polarizing filter.

With the polarizing filter, you are able to cut down on the reflections and generally produce a more saturated image which adds a Special Effects to your photographs. Although this effect can be easily created by using some photo editing software, it is still worth the effort getting a polarizing filter for a quick and immediate effect.

The polarizing filter can be attached effortlessly to the front of your lens by screwing it in (in most cases). There is another ring (normally the outer ring of the filter) where you can rotate 360 degree. Look through the viewfinder while rotating the ring and you will be able to realize the change in effect the filter produced.

You can do an easy experiment with the filter and camera. With the filter attached, direct your camera to the blue sky. Look through the viewfinder and observe carefully at the blue sky as you rotate the outer ring. You will notice that the blue sky getting darker and darker as you rotate the ring, the color of sky gets lighter and even back to the original color.

Generally, the effect of the polarizing filter will be maximize when the sun is 90 angle to your subject. The filter will have minimal or no effect when the sun is directly behind your main subject. With this illustration, I hope that you will be able to appreciate the relationship between the polarizing effects with respect to the sun position and to your target subject.

Polarizing filter can be used when capturing clear and still water during day time as well. It can aid by reducing the reflections and you are able to see into the water. The same explanation can be applied to shooting reflective surface. For example leaves and foliage to achieve a nice saturated color.

Despite this filter is able to produce a more saturated effect on your image, do be careful not to over-do it. This will result in your photographs bearing unnatural color, which is not too attractive to landscape photographer (unless you want the effect purposely). Normally, what most photographers do is they will rotate the ring of the filter to obtain maximum effect, and which that, they go back slightly by a few degrees to gain the best effect.

There are mainly 2 types of polarizing filter known as liner and circular. As technology advance, most SLR today are digital in nature with auto-focus ability. Thus a circular polarizer is widely used for cameras that has a through-the-lens metering system and/or auto-focus.

Hopefully with the explanations above, you are able to appreciate the use and the significance of having a polarizing filter. There is a old saying, "Practice Make Perfect". Do attempt more outdoor shots and appreciate the use of a polarizing filter and you will be able to utilize this skill set naturally.

Yong Sak is a Singapore Freelance Photographer who owns a Photography Portal, sharing Amateur Photography Tips for those who are new and keen in photography. Please view his portfolio in Chin Yong Sak Photographs, where he showcase his works for sharing and comments.

Article Source: http://www.earticlesonline.com/Article/The-Use-of-A-Polarizing-Filter/357465

Is it practical to use a circular polarizer with a sky filter?

It's not recommended.
The sky filter is usually placed on as a sacrifical filter to protect the lens and doesn't serve a great deal of optical purpose. The situations where you would use a skylight filter (to clear UV haze) and a polariser (usually in clear skies, or shooting reflective surfaces) are quite different.

If you are using a wide angle lens there is more chance of vignetting (black edges where the field of view of the lens catches the double mounted filters in shot)

There are other problems such as internal reflection between the filters unless you are using very expensive Super Hmc hoyas.

There are other risks such as over tightening and in doing so damaging the filters or worse the lens.

All in all, avoid.
If you must double mount filters then i would suggest you use something like the cokin or lee slot in filters.

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