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Brand: Tianya/W-Tianya
Product Name: Mid-Gray Mirror (ND4 Reducer)
Caliber: 40.5mm 52mm 58mm 62mm 67mm 72mm 77mm 82mm
![](https://img.alicdn.com/imgextra/i3/1706761884/TB2uD5dXv_HK1JjSszhXXacIVXa_!!1706761884.jpg)
![](https://img.alicdn.com/imgextra/i2/1706761884/TB2yredXsrHK1JjSspfXXbsrXXa_!!1706761884.jpg)
![](https://img.alicdn.com/imgextra/i2/1706761884/TB2jwmcXv_HK1JjSszfXXc1pVXa_!!1706761884.jpg)
![](https://img.alicdn.com/imgextra/i1/1706761884/TB2dNPpXeMxLeJjSspoXXaN.VXa_!!1706761884.jpg)
The effect after using ND4 filter![](https://img.alicdn.com/imgextra/i2/1706761884/TB2N0SdXwvGK1Jjy0FhXXcgiXXa_!!1706761884.jpg)
Brief description: The gray scale mirror is used to reduce the amount of light entering to achieve special exposure effects
In many cases, due to the intensity of the external light, we cannot get a long enough shutter time and cannot realize our photography intentions.
For example, when shooting water in the field, we hope to use a one-second shutter to make the water present a soft cotton-like texture. However, due to the strong light, even when shooting with the camera''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s minimum aperture and minimum iso, the shutter speed is still around 1/30 second. The solution at this time is to use one or even two nd8 lenses to attenuate the light entering the lens.ND4 reduces the exposure by 2 stops, and ND8 reduces the exposure by 3 stops.
There is a simple formula. Assuming that the shutter speed for normal exposure of your camera is T without adding nd, then after adding nd, under the same light conditions, aperture size and iso, the shutter speed for normal exposure = T*x, this x is the number marked on the back of the nd lens, x=4 for nd4, x=8 for nd8.
When encountering violent sunlight or gray cloudy days, the medium gray lens improves the shooting effect very obviously. The neutral gray lens is also called a light reduction lens, which was originally used to reduce the light passing through the lens and avoid overexposure of the picture. In digital photography, the problem of insufficient CCD exposure latitude has always been obvious. The mid-gray lens can suppress the high light level and enable it to achieve accurate exposure, but has little effect on the low light level imaging, so it has a great impact on the overall image exposure! Especially in landscape shooting, its practicality will be veryhigh.
![](https://img.alicdn.com/imgextra/i1/1706761884/TB2eMqcXv_HK1JjSszfXXc1pVXa_!!1706761884.jpg)
The image before using the gray mirror in rainy day
In addition, medium gray mirrors can also be used in large quantities“withstand”Scattered light, when shooting in cloudy or rainy environments, it can increase the color saturation of the picture, and the reduction of scattered light can also make the picture look more transparent. However, the use of a mid-gray lens will reduce the shutter speed by 2 speeds, and if the light environment is poor, the image may be blurred.
![](https://img.alicdn.com/imgextra/i1/1706761884/TB2eTjoXeMxLeJjy0FjXXcDbVXa_!!1706761884.jpg)
The image after using the gray mirror in rainy day
We often use the ND4 logo for medium gray mirrors, as well as ND8 dark gray mirrors, and gradient gray mirrors. Among them, the ND4 middle gray lens is our more commonly used filter. The gray lens is not only the choice of professional lenses, many consumer-grade digital cameras can also be connected to the gray lens through the adapter ring, which is also the choice of many users.
The ND lens ring is made of metal, the outer ring is threaded, and other screw fittings can be added, which does not affect the use of the lens cover. Each filter has its own plastic storage box