White light vs H-alpha filter

Neutralni filter.

This is a representation between the white light and the H-alpha filter for the Sun.
The white light filter blocks 99.9999% of incoming radiation in the visible part of the spectrum as well as ultraviolet and infrared radiation. That small percentage of 0.0001% is strong enough that we can observe the Sun safely and see its surface or photosphere, Sunspots, granulation and faculae. The photosphere is an atmospheric layer about 400 km thick.
The H-alpha filter, with the help of the D-ERF thermal filter, blocks wavelengths from 280-1500 nm, passing only 80 nm around the H-alpha line. The filter performs further filtration and you only get the H-alpha line or a narrow area around it on the eyepiece or camera. The chromosphere is the layer above the photosphere and is located at an altitude of 400-2000 km.
The white light filter sees the surface, the photosphere, while the H-alpha filter sees the upper atmospheric layer or the chromosphere. The photos show the same area taken with different filters.
The photo on the left is a shot through a white light filter and we can see sunspots and granulation.
The photo on the right is the same area but through the H-alpha filter. We see sunspots, but we can also see the structure of active areas around the spots in the chromosphere, the three white dots are Ellerman bombs that last only a few minutes, and the structure of the chromosphere itself.