Long answer: Please understand the relationship between Aperture, shutter speed and ISO. like i said a few times in my earlier post already, a CPL may reduce the light coming in by 1.5 to 2 stops. So based on that, and apply the relationship of A, S and ISO. Then apply that to the rule of 1/focal-length. You will get your answer. There is no single answer for this question.
But normally, my experience with CPL is that most of the reflection on flat glass planes get polarized(blocked off).
Just go answer the TS, there are also other effect filters like star bust filter or softening filter. The more experience you get, the more you start to demand from your equipment, then you can start to collect interesting filters like 14stop ND filters.
For stepping up, i think most pros step all your lens to 77mm to share filters, so they don't need to carry around too much stuff. Imagine caring 3-4 different CPL sizes. They can leave the Step up rings on permanently and just get a 77mm cap.
And to answer why do people use ND filter, one reason is to create "movement" it STIMULATES (not simulate =D) something like a long exposure shot in the night. just in the day. Just 1 example. Or if u r shooting lake landscape and want a stronger reflection, the ND filter can help to allow the photographer to have a longer exposure time, while not overexposing the shot.
Last edited by Complex13717421; 27th August 2009 at 02:16 AM.
quick question... which brand of uv filter u trust and why...?? would u spend extra bucks on more expensive uv filter...??
A recent UV filter review, also highlighting potential issues introduced by UV filters.