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02/18/2006 01:40:21 AM · #1 |
Hello..
Could someone explain exactly what it is an ND filter does, and what situations it is best used for?
Also, I think I understand what a polarizing filter does.. cuts down on glare right?
What situations would a polarizing filter be best used for other than light sparkling on water or to deepen the blue of the sky? Unless I'm wrong about what a polarizer does.. in which case, enlighten me about that too?
And uhm.. can you use simple definitions I get lost fairly easily when technical terms are tossed out.
Thanks!
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02/18/2006 01:42:42 AM · #2 |
ND filter simply reduce the amoutn of light that goes into your lens. They are used when you want a longer shutter speed than you can get withou them. They are also used when you want a wider aperture than the light conditions allow for. Polarizers can reduce reflections but they also give you better color saturation in high contrast scenes.
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02/18/2006 01:49:51 AM · #3 |
Originally posted by jmsetzler:
ND filter simply reduce the amoutn of light that goes into your lens. They are used when you want a longer shutter speed than you can get withou them. They are also used when you want a wider aperture than the light conditions allow for. Polarizers can reduce reflections but they also give you better color saturation in high contrast scenes. |
So an ND filter would give me that smooth froth look on a waterfall/stream even if its quite sunny out? Or would I need a number of those filters to accomplish that?
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02/18/2006 01:58:05 AM · #4 |
ND filters are measured in stops (one stop less being 1/2 the amount of light), so that depends on the other factors in the scene. If it's really bright, like 1/600 at ISO 100 and F/5.6, then a 1 stop would only get you 1/300 shutter at the same settings. If the exposure was correct at 1/125, and you had a 2-stop filter, you'd be able to use 1/30.
If you can stop your lens down to F/32, and use a 2-stop or more ND filter, you should need some fairly long shutter speeds during the day. |
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02/18/2006 01:59:25 AM · #5 |
Originally posted by LucidLotus:
So an ND filter would give me that smooth froth look on a waterfall/stream even if its quite sunny out? Or would I need a number of those filters to accomplish that? |
It might, but bright sunny conditions are simply the wrong time to do that sort of photo :)
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02/18/2006 09:21:04 AM · #6 |
| There is also a good explanation here in this thread. |
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