Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Very weak polarizing effect!

Stacking two polarizers, and rotating one, should at a certain angle lead to no light getting through, black, dark, nothing. Not so with this one, it's very weak in this regard. This might be fine for landscape photography, but in many applications a very strong elimination of reflections is desired. If this filter is weak, why don't they say so in the tech specs? I bought some better polarizers, and much more expensive ones, which actually do what they are supposed to, total black when stacked and turned in a specific angle to each other.