I have several K&F products and they have all proved to be well built and effective, this 67mm K&F clip on polarizer is definitely up to the same high standard as their other products in my kit and as usual, really well priced!This clip on filter is mostly used on an older non AI assisted phone camera so the results are very much true to what you see through the filter at the time of shooting. I have tried using this filter on an AI assisted camera but find myself going back to non AI camera as I just know where I am with that.The filter is supplied in its own protective case which I have colour coded with acrylic paint, this is due to having two other identical filter cases in my kit and gives me a ready reference to which filter I have in my hand. The case is soft but robust and does a great job of protecting the filter.You'll soon find practice makes perfect when using the K&F filter, like most things in life there is a learning curve to complete before you get the best results from it, this said it's a short curve and it's not like you have to spend hours in the darkroom waiting to see the results