77mm polarizing filter of good quality and above all excellent price... It comes with an additional cap and a rigid plastic box as well as a retaining cord for the cap... For the test I mounted it on a Tamron 10-24 f3.5-5.6, a wide angle for Reflex in APSC format.. It mounts without any kind of problem or jamming, the thread is correct and well made. Once mounted it is possible to rotate the filter smoothly with minimal effort, this helps to operate with just one finger and prevents it from rotating by itself.. It is a little thicker than a thin type UV filter, but this is normal due to the necessary rotation that the CPL must have, the greater thickness does not introduce any type of vignetting on APSC. The removal of all metallic and non-metallic reflections, of diffused light, the increase in contrast and other improvements made can be seen by rotating the filter until the desired degree is reached, the maximum attenuation value for light with polarization opposite to the desired one is normally 90 ° ... I have attached some shots to show the results with or without polarization. I have not noticed any type of chromatic dominant or unwanted coloring. Usually it is used for landscape photos, sea, or in any case all those situations in which you want to capture details blurred by diffused or reflected light. Personally I am very satisfied with the result obtained and considering the extremely low selling price given the diameter of 77mm and the type of filter I can only recommend it to all amateur photographers and PROs looking for a spare filter in an emergency.....