What telescope can you use to see the fish in the water when fishing?

You can see the fish in the water by wearing a polarizer when fishing. The polarizer uses the polarization principle of light. Filtering removes and excludes the direct light in the beam, making the vision clearer.

Extended data:

The working principle of polarizer is to selectively filter light from a certain direction. By filtering out a lot of polarized light in diffuse reflection, the light intensity in the sky is weakened, the sky is darkened and the contrast between the blue sky and white clouds is increased.

Look at the viewfinder and rotate the front mirror when shooting. In the viewfinder, the effect is most obvious when the sky is darkest, and the difference between the darkest and the most appearance is 90 degrees. You can turn to any angle between the darkest and brightest as needed.

The function of PL mirror is to filter the reflected light and increase the imaging contrast.

PL mirror can also effectively weaken or eliminate the reflection of nonmetallic surface.

This kind of reflected light is typical polarized light (the reflection of metal surface is complicated, which is related to the incident wavelength and surface roughness. When the conductivity of metal is not zero, the reflection coefficient becomes complicated, which leads to the phase change of P and S components, and the reflected light becomes elliptically polarized. PL is linearly biased, so it has no effect on the reflected light of metal).

By adjusting the polarizer, this part of the reflection can be filtered out, thus improving the imaging quality of the subject and the clarity of the picture. For example, using a polarizer can reduce the reflection of the water surface, so that you can clearly photograph the fish in the water.

When shooting such a scene, the projection angle of the light source should be close to the projection angle of the camera, and the maximum deflection angle should be between 30 and 40 degrees. When in use, it can be adjusted by slowly rotating the lens in front of the filter to minimize the reflection on the scene surface.

In addition, the polarizer can effectively improve the color saturation and contrast, because it can absorb the stray light reflected by fog or dust in all directions in the atmosphere, thus making the photographed image more pure. For example, in the still life photography of flowers, a polarizer is often used to take color photos.

It is very useful in landscape photography, flower photography and shooting some specific scenes with strong reflection. When the polarizer is used to take landscape photos, it has an excellent effect on depicting clouds.

The refractive index of light in the blue sky is greater than that of light scattered by white clouds. Using polarizer can also make the color of green leaves more saturated and eliminate the fog of shooting urban scenery at low angles.

References:

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