The Drama Polarizer Filter is an excellent accessory. Whether you use it by itself on the iPhone or by attaching it to the Sandmarc Wide Angle (16mm) or Telephoto (60mm). I have used it all three ways. The improvement in the resulting photos is a blue sky instead of a blown out sky, shots that include foliage show their true color without distracting sunlight reflections. I have found using this filter can turn an ok photo into a great photo.
I love the lens. It filters out blinding light and really brings out the detail of the scenes I take videos of as well as the pictures.
+ I am satisfied with this filter. The clip is securely mounted and it's easy to use even with lenses from Sandmarc. - It would be better, if the hole on the clip was bigger for iphone11 pro's triple cameras. It works fine with an iphone pro itself (without a case) but if you use a case (especially bumper one) and you change cameras often with pinch zoom, then filter also need to be adjusted, otherwise you can see the clip on edges.