Problems of neodymium reduction mirror.

1.ND 1000 minus 10 is basically the original normal exposure1100. Normal exposure plus ND 1000 requires 100.

2. By analogy, ND2000 should be 1 1, ND4000 is 12, and ND8000 is 13.

3. Your ND 10000 should exceed 13 if the standard error of dimming is small, so it reaches the original1125.

Normal exposure takes more than 30s!

The reducing mirror is also called medium gray density mirror, neutral grey mirror or grey mirror and nd mirror for short. Its main function is to reduce the amount of light entering the camera. The reducing mirror plays a very important role in a good photo.

What is a reducing mirror:

Reducing the mirror can bring more exposure means to your creation, turn day into night and give full play to the creative space; Many times, due to the intensity of external light, we can't get enough shutter time, so we can't realize our photography intention. For example, when shooting water in the wild, we hope to use the shutter of 1 sec to make the water flow appear soft, like cotton.