Difference between polarizing filters & ND filter


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rysouke

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Both functions seem like the same...to reduce the amount of light entering the lens...other than that what are their difference??
 

yrh0413

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PLs not only cut down light by 2-stops, it does what its name applies: polarizing effect. Do a google search please and understand how PLs work
 

rysouke

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i did do a search and PLs also reduce reflections and increase contrast...and for ND filter reduce the amt of light ...so the shutter speed can be reduce too ..and PLs also the same..
 

DrSpock

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Warp back to Simei
i did do a search and PLs also reduce reflections and increase contrast...and for ND filter reduce the amt of light ...so the shutter speed can be reduce too ..and PLs also the same..
Main diff btn the two filters

CPL - will make skies appear deeper blue, will reduce glare and reflections off of water (can see the rocks or fishes of course if the water is crystal clear not an x-ray vision) and other surfaces like leaves, and will reduce the contrast between land and sky and bring out the cloud details too.

Nice videos on effect of using CPL Here & here

ND - This is useful when a sufficiently long exposure time( 1 sec or more) is not otherwise attainable within a given range of possible apertures (at the lowest ISO setting).

Situations where ND filters are particularly useful for the 'special effects' include:

■Smoothing water movement in waterfalls, rivers, oceans, etc.
■Achieving a shallower depth of field in very bright light
■Reducing diffraction (which reduces sharpness) by enabling a larger aperture
■Making moving objects less apparent or not visible (such as people or cars)
■Introducing blur to convey motion with moving subjects

A nice video on ND filters

Read more here
 

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daredevil123

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Oct 25, 2005
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TS,

Don't think of results. Think of the process. What is the science behind it.

ND is simply darker and reduces the light coming in.

Polarizer filters out stray light waves that are not of a certain pattern. See this:
http://en.wikipedia.org/wiki/Polarizer

Once you understand this, it will be easier.
 

night86mare

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Aug 25, 2006
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Both functions seem like the same...to reduce the amount of light entering the lens...other than that what are their difference??
oh dear, google is your best friend, you know that?
 

night86mare

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i did do a search and PLs also reduce reflections and increase contrast...and for ND filter reduce the amt of light ...so the shutter speed can be reduce too ..and PLs also the same..
tada.

there's your answer. wasn't that hard, was it?

PLs increase contrast by reducing glare and also , they will increase intensity of blue in the sky.
 

kohanson

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Here's a video to share from youtube showing us the effect of a polarizer.

[youtubehd]7Vvz_d6APXk[/youtubehd]
 

rysouke

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i watch this video already...i know the effect..i am thinking to get one...any recommendation?
 

Numnumball

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Kenko Pro1, Hoya and B+W are all reputable brands, depends on how deep ur pockets goes.. :)
 

rysouke

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erm..maybe will take alook at hoya and B+w brands..btw only outdoor shooting then use CPL?? since it will cut down the amt of light ..if use it indoor...then flash must be on right?
 

Octarine

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erm..maybe will take alook at hoya and B+w brands..btw only outdoor shooting then use CPL?? since it will cut down the amt of light ..if use it indoor...then flash must be on right?
C'mon, read again. Hint: pay close attention to the role of the sun. Where is the sun indoors? What stray light do you want to filter indoors?
As mentioned: do learn about the basics behind, don't just look at effects.
 

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Rashkae

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Nov 28, 2005
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erm..maybe will take alook at hoya and B+w brands..btw only outdoor shooting then use CPL?? since it will cut down the amt of light ..if use it indoor...then flash must be on right?
If you really spent time reading up on what a CPL does, you will know why your question, and the answer, are self-evident.
 

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