Thanks, I had seen that but still didn't understand it. This is all relatively new to me so hard to get my head around especially when written. Filters just arrived today so will try them out, will probably make more sense to me then.
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These filter sets have two kinds of filters
ND (Neutral Density) filters
PL (Circular Polarizer)
ND-PL a combo filter of the above two.
NDs are easier to understand. They just cut the light hitting the camera sensor and are label in "stops". ND-8 cuts down three stops of light, ND-16 four stops, ND-32 five stops and ND-64 six stops.
So what is the use? It is a creative tool to lower the shutter speed for a given frame rate. Which gives you a more pleasing image on screen, more cinematic.
The polarizer cuts glare hitting the sensor. For example, when shooting pool, you will be able to see through the water. It needs to be rotated on the lens to see the effect.
the ND-PL combo marries the two in one filter.
One caveat when using a polarizer, when the light source is dead in front or back it has no effect. It is more pronounced when the light source is perpendicular to the subject.
So how do you use them? I live in Arizona where the light is very bright so I usually start with a ND-8 early morning an late afternoon. I use the ND-32 mid day and the ND-16 in between. These are not absolute rules either. You will develop a feel the more you use them.
For the Polarizer, it is harder to use because you have to be aware of the light source and set the angle of the filter on the lens by rotating the filter until the desire amount of polarization is achieved.
You have to practice your shot to set the correct amount of polarization then shoot it in my opinion. With only an ND filter you don't have to worry about it.
It is easy to over polarize which will destroy your image. So be careful when setting it.
Lastly, I always fly with a filter on to protect the lens.
Hope that helps