SIOTI ND fiter,Gradient ND Square Filter Kit 4X6'' (100X150mm) with Gradient ND2 & Gradient ND4 & Gradient ND8 & Gradient 16 for Cokin Z Lee Hitech Sioti Holder (G.ND)

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About SIOTI ND Fiter,Gradient ND Square Filter Kit

Item Specification: Packing weight: 0.32lb(156g) Product weight:0.28lb(126g) Packing size: 7.1inch*4.3inch*1.2inch (18cm*11cm*3cm) Package Includes: 1×Grandient Grandient ND2 1×Grandient Grandient ND4 1×Grandient Grandient ND8 1×Grandient Grandient ND16 2×Cleaning wiper Warning: Don't clean with unprofessional wiper, otherwise, filter will be scratched and never be reparative. Don't touch surface with your hand or anything, when there are some particle on filter surface, you can blow it with air blower(don't blow with mouth). Service: 3 years warranty from SIOTI, 30 days money back. For better shopping experience, if you have any inqury or any problem about our products, freely contact with us to get help ,even refund or return,we will let everyone satisfied. What does a Grandient ND Filter do: You want to capure mountain/prairie/sea/wave,however, but sky is too bright, and so shy field is over exposure and mountain/prairie/sea/wave field is low exposure, sometimes software can't help you, at this time you need grandient Neutral Density filter to match each other. How to use: you use one shutter speed(a) to let sky right exposure, and use one shutter speed(b) to let mountain/prairie/sea/wave right exposure, X=a/b, X approach one of 2/4/8/16/32/64, you chose the ND value, for example, 1/400s for sky, 1/100s for mountain/prairie/sea/wave, 4=400/100, you choose ND4.