Do you use the 16 most of the time?
The faster the shutter the less light to the image sensor.
The slower the shutter speed, the more light hits the sensor to create the image.
This is known as , exposure.
The ND filters that you are trying to learn offer another level of exposure, while filtering light.
Or in this case polarizing light. Just like sunglasses.
All of it has to do with exposure, given ambient light at a particular light source.
Blown images
I can show you a few of those , thats for sure.
Blown image, means , areas of the image are over exposed.
It happens a lot with " un-even light"
So lets say , you have beautiful clear bright skies and you want to capture an image with your drone.
Part of the sky will be in the photo, and the other part, and/or your subject matter will be below the brightest part of the image.
The camera/lens cannot balance this perfectly. It will either expose for the sky, leaving your subject under-exposed, or, expose your subject , leaving your sky blown out, and/or over-exposed.
It's a balancing act.
It is controlled, mainly, by three factors.
ISO, Shutter speed, and f stop/aperture.
ISO will increase your sensors sensitivity to light, which in turn will allow for a faster shutter speed, but with high ISO numbers comes image degradation, commonly referred to as noise.
In other words, if you can balance your light and wait for the right light, you don't need any filter.
Not to mention, once you learn how to process an image and since were working with digital imagery , all of this can be altered.
But it is always best to get , as close as possible to , correct exposures. It allows you more room to push an image.
If this is what you really want to do, all of this will start making sense.
