Heliopan 77mm ND 0.6 - 4x Neutral Density Filter Reviews:
GREAT PRODUCT !!!
Great price for such a excellent product. If you own high quality lenses like Canon L series don't be cheap and go for the best one. Heliopan is one of the best brands in glasses. I own a few Heliopan filters and believe me THEY ARE THE BEST EVER. They are expensive but this is the best FILTERS quality in the world. Of course LIFETIME WARRANTY.