Basic knowledge of polarizer(3)

Matters needing attention

1.Cheap Ray Ban Sunglasses has a linear polarize (line) and circular polarize (DOT) two, the use method and gain the effect; but the circular polarization can make light through the filter is circular rather than linear trend, especially suitable for the camera with auto focus system.

The use of single lens reflex camera, because the camera using a reflective lens, circular polarize can ensure the accuracy of focusing.

AF cheaper line may be used in the process may affect some camera, so if you use polarize on a digital camera case, and require the use of circular polarization.

The 2 polarize is usually thicker, it is best not used in combination with other filters, or very easy to form the black in the picture.

The 3 polarize itself will absorb about 75% of the light, if in cloudy days, or using a small aperture snapshot, the best three tripod stable body.

Light, so there is no need to light because of the reduced exposure compensation.

Comparison of the general sun glasses and polarizing sunglasses:

General Ray Ban Sunglasses only by reducing the effect of light, because light can not filter lenses in general, we can only reduce the glare, UV intensity, and can not completely block the harmful rays, so its function is to reduce the damage to the eyes, but in general the sun glasses is the biggest advantage of epidemic. Polarized lenses due to a polarizing nature can be completely blocked due to scattering, refraction, reflection of various factors such as the dazzling glare. Can also harmful to the human eye completely block UV light, make long-term activities in bright light, the eyes easily tired, to really protect the function, and can see things more clearly, stereo.

Application of the polarizing sunglasses:

Polarized sunglasses for 100% block harmful rays, so it can be used in:

1 medical patients need operation: eyes, full range of protection, polarized sunglasses are the best choice.

2 outdoor activities such as skiing, fishing, water sports, all need to completely block the harmful rays of the sun glasses, in order to avoid eye injury or fatigue.

The 3 goggles

◆ periscope testing:

A simple method for testing of polarized lens and UV400 identification of polarized lenses testing

Glasses are polarized lenses, you can do-it-yourself test: looking for a liquid crystal display (LCD computer monitors and mobile phone screen), glasses will be level in front of the screen, then Cheap Ray Bans lens does not change, then the glasses to the clockwise rotation to 45 ° angle, see the lens color depth, then tu again back to normal, which is polarized lenses, if no matter how rotation does not change, it is not a polarize. (Note that certain if the liquid crystal display)