Selasa, 23 April 2013

Understanding The Polarizing Filter

By Luke Walker


A polarizing filter is an incredibly diverse and helpful tool that you can easily slide over your lens. It gets rid of reflections, colour and glare from things.

Let's pretend you have a nice colourful picture that you're thinking of taking. It may be of some cars or bicycles for example. Let's take a look at how you would use a polarizing filter in this situation.

A lot of people don't fully understand exactly when they should be using polarizers. If the sun is behind you. In this situation the polarizer won't have any effect at all. Also, if you're shooting into the sun, the polarizer will have no effect at all. The sunlight has to be coming from the side, ideally at a right angle to your subject.

With a polarizer you twist it to see the effect. You will easily notice it begin to roll around the image, darkening the sky behind it. It will make a bright blue sky look a deeper shade of blue as well as taking the reflections off the objects you are shooting, giving you a very pleasant, strong, saturated colour. This makes a fantastic photograph.

It is worth mentioning that the stronger the sun is, the stronger the effect will be, and it could also appear to be a little bit too strong, so it is best to spend tim on this and find the right amount of polarization as you rotate the filter.

Another thing worth mentioning is that if you're shooting at high altitudes such as on a skiing vacation or a mountain climbing holiday, the effect will be too strong. You may even find that it could even turn the sky black a lot of the time. Depending on your environment you may want to dial the polarizer back slightly or don't use one at all.

Another instance is if you don't have much light, say for example you are shooting a garden and it's raining. The rain has covered all of the vegetation with a beautiful glistening water. Imagine if you want to get rid of those reflections so that you just see the strong, saturated colour. This is a great time to use a polarizer.

Another important thing to mention about a polarizing filter is that it is rather dark, and removes a couple of stops of light. So it is recommended to use it with a tripod.

Finally, don't think that using one will make all of your pictures look superbly colourful and vivid. It may not actually produce such an effect. Instead, it may result in fuzzy pictures because it is cutting away light, so your shutter speed will be slower. In conclusion, polarizing filters are very versatile and useful, and can be used in all kinds of photography. They can make a big difference when used properly.




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