Ok, so the filter itself is a UV filter and if it is doing its job, it protects your lens from damage, dirt, sand, etc without impacting image quality. K&F is a good brand and this filter does its job.

The filter screwed on nicely without any of the squeaky sounds some filters make. I did not notice any impact on my images.

The filter is thinner than some of my other filters, but it does have knurling in the edges to assist in twisting it on and off.

But enough about the filter...The case is amazing. While some filters come in a hard plastic case filled with form-fitting foam, this filter comes with a leather (albeit maybe fake leather) and canvas semi-rigid case. The inside is lined with a micro suede type material and has a pull string so that you can get the filter out of the case without touching the glass. This pull string raises the filter up out of the pocket of the case much like some wallets that have interior pull strings to push out credit cards.

Overall, I like the filter and am impressed with the amount of energy invested in the case. These seems like a quality product to me