High optical quality filter, just like all their other products. I highly recommend this to all landscape photographers or anyone interested in experimenting with day long exposure as this is a convenient single piece which is affordable as well. It is easy to slide and the gradient change is noticeable yet subtle. It does not leave a colour cast nor does it affect optical quality. The filter may not be the thinnest but it does not leave any colour cast even with wideangle lenses. The luxorious little case and box that it comes in leaves little more to be desired for. This is indeed a top product for its price. I will be purchasing more of their products and will be recommending this to everyone at my workshop. This single piece saves you the trouble of having to keep changing filters which may cause damage or scratch your other filters or even worse, missing the perfect light of the moment.
31/01/2016