Having more and more need to play with blur effects in the middle of the day (staying at 1.4 in good weather without going over 1/8000th), I went looking for a 77mm filter that was cheap but efficient enough to allow me to realize my projects.
This is not my first purchase from this brand, which had made a strong impression on me with their classic ND and their good value tripods... so I let myself be tempted. And I must say that after the first disappointment (yes, beyond ND1000, the filter is totally unusable because of the appearance of a cross vignetting) and well this filter finally does a very good job for the price!

Also, the filter is well built, and it is important when there is a mechanism to rotate the polarizing lights in front of each other to obtain this light blocking. The aluminium ring is very rigid, the ring is soft... just a little disappointment because I would have liked some kind of stop between the maximum and minimum effect... here the filter turns without any limitation.

Then, the filter does not add vignetting because of a more generous output diameter, all with threading! The output diameter is 82mm, so it is quite common.

Then, the loss of sharpness, although existing, is very reduced. The effect on the bokeh is transparent, an excellent performance! But on the other hand, the filter brings a rather hot global tint that is neither unpleasant nor too important and that it is therefore possible to correct.

The effect of this filter between ND8 and ND1000 is just great! Nothing to report, and it will indeed be necessary to avoid it beyond this value not to have this effect of rather important vignetting on the edges.

So for the price good quality, and some defects in the use that it will be necessary to have in the head to avoid the bad surprises. For the price, it suits me perfectly!