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Filters

D

darktiger

[H]ard|DCer of the Month - April 2007
Joined
Apr 10, 2003
Messages
11,819
I sortof know the difference between the ND filter and the polarizing filter. What do you all use more frequently? What are the MAJOR differences between filters?
 
They are intended for completely different uses. The major use of an ND filter is to achieve a different range of exposure parameters than your camera and lens otherwise be capable of. For example, say you're trying to get that classic smoothed-over look in the flow of water over a waterfall. If it's a very bright day, you may not be able to achieve the long exposure time you need without massively overexposing the photo, even at the smallest aperture and lowest ISO. Slap a ND 0.6 on there, and now you can take a photo two stops longer. In summary, all an ND filter is intended to do is make the picture darker.

A polarizing filter also tends to make the picture substantially darker (maybe one or two stops), but it has other, more important uses. The two primary uses (for me, at least) are to remove glare and hilights in outdoor light and to increase contrast in the sky. The key fact here is that light coming down from the sun is significantly polarized, which is what makes the polarizing filter effective; it won't have the same effects under (normal) artificial lighting.
 
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