Japan Kenko kenko light microscopy (ND mirror) 

ND4 lens during the exposure will be reduced by 2-speed exposure amount
ND8 lens during the exposure will be reduced by 3 levels exposure amount

 

弧形的钢丝是用来抵住镜片防止晃动

Introduction ------ Kenko (made in Japan)

When shooting outdoors, because we can not adjust the brightness of the sun, if the light is too strong, you can not use a slower shutter speed, and therefore can not use a slow shutter speed to show the flow of water, such as blur, crowd, etc., even if the set lowest sensitivity, the smallest aperture, can not get enough slow shutter speed, then we should aid the ND filter. ND filter, also known as gray density mirror or light microscopy, is designed to reduce the amount of light entering the camera. ? The role of non-selective filter gray mirror, a variety of different wavelengths of light dimming capability is equal and uniform, so the gray mirror will have little effect on the color and the body of the scene. Ken High School gray mirror using advanced manufacturing technology, can reproduce true color and contrast of the scene. ? Role of gray mirror are: 1, want to suppress sensitivity when the photosensitive film sensitivity; 2, the use of large-aperture lens and open aperture shooting; 3, I hope very slow shutter speeds. According gray mirror dimming capability, divided into three types, ND2 can reduce a file exposure, ND4 2 files can reduce exposure, ND8 reduces 3 files came to light. It may be necessary to use a two-piece combination of overlapping, higher dimming effect. ? Widely used in high altitude, sea and snow, and other outdoor shooting situations. Both suitable for film cameras, digital cameras and camcorders are also suitable for use.

Under many cases, the relationship between the intensity of ambient light, we can not get enough long shutter time, you will not be able to realize their photographic expression.

For example, the water captured in the wild, we hope to use a second shutter to let the water showing the soft texture of cotton wool. However, due to strong light, even with the minimum aperture of the camera and shoot the lowest iso shutter speed remains at about 1/30 second. The only way this time is to use a lens or two nd8 to weaken the light entering the lens.

kenko (Kenko) ND2 is to reduce a shift of exposure, ND4 is to reduce the exposure of two tranches, ND8 reduce third gear came to light.

There is a simple formula, assuming your camera in the case did not add nd, the normal exposure shutter speed is T, then add nd later, under the same lighting conditions, aperture and iso, normal exposure shutter speed = T * x, x is behind this marked nd lens that number, nd4 if x = 4, nd8 if x = 8.

Due process, nd more big factor behind its impact on the color temperature is greater.

A great impact on domestic gray mirror color temperature, not suitable for purchase. The impact of imports kenko filter color temperature is almost negligible, it is more price-pen selection.

Neutral gray lenses (ND) filter effect is not selective, on a variety of different wavelengths of light to reduce capacity is equal, uniform; that, ND lens will not have any impact on the color of the original object, but also a true representation of the scene contrast. (Essentially due process, or will produce a small amount of color temperature deviation)