ND2, ND4, ND8, ND16, ND32, ND200, ND400, unlimited adjusting between all levels, providing you with more freedom of creation!
Lens and Coating: Made of top grade Germany Schott Glass and with Japanese exclusive coating. Higher degree of color reproduction, no color cast.
Product Improvement: We are committed to delivering the world's thinnest adjustable ND filter, and here comes the 3rd generation. This time we have a higher degree of color reproduction. Compared with the previous generation ND400, this one has perfect solution for black level. You can get more perfect effect when using the wide angle.
Special Application
ND Filters can remove people moving around the scene. ND-400 and Above have high intensity light reduction feature, which can reduce your shutter speed. Those several seconds of clutter caused by people walking by will be mostly removed when the light reaches the Light-sensitive chip of your camera. Moreover, together with long exposure time, you can hardly see the clutter when your photo comes out.
Exposure Formula of ND Filters 
Please Note that ND2.7 is equalivent or close to ND400
Smartphone owners should have a look at the tool NDCalc. This handy app calculates the required exposure time, and is available for PocketPC, iPad, iPhone and iPod touch. Apple users can follow this link :http://itunes.apple.com/app/ndcalc/id300699192?mt=8
Video Shoot with ND filter
It's very common to have HD recording in DSLR Cameras. Especially for Canon 5D MKII, Canon 7D and Nikon D7000, which have already been used by many Professionals for HD Video Recording. In Video shooting, to achieve Coherent pictures, Normally shutter Value should be 30-100. If you need to use a large aperture, the screen will be overexposed, so you need to use ND filter to reduce the amount of light passing through the camera lens.
