As a rule, I do not write reviews that simply repeat the product page verbiage. That’s for you to read before you decide to buy. I am also getting away from what, where, when, who, and how of gizmos. I assume that if you are buying a gizmo, you know what it does and then decide if you can use it – for whatever.

For me, ND and CPL filters are mandatory for landscape photography in so far as they can accomplish what post-processing cannot. This pairing offers the best of both worlds in a single filter without introducing aberrations or vignetting except with wide-angle lenses. With my Nikkor AF-S FX lenses, I will get very slight vignetting with this combo or other stacked filters at f/4, 16mm; it disappears at 21mm. The vignetting is so slight that, if desired, post-processing readily eliminates it so there is no need to stop down.

I have used filters with film photography for decades without experiencing any of the alleged deleterious aberrations/effects. For me, digital photography is no exception. In fact, most photographers and authors agree that there is no data to suggest that filters introduce aberrations except for, possibly, ghosting. I have a few K&F filters and have never been disappointed. In other words, relax and have fun creating with this combo.

To some conflicting reviews.

Cannot use lens shade/cap – or – the lens cap fits fine. (Depends on . . ..)

Color shift – or no color shift. (Looks like one instance of underexposure to me.)

No stops between ND options – or – nice that there are no stops between ND options. (Food vs. poison)

So, a filter combo to afford one the ability to adjust/correct exposure in a variety of situations - for me, landscape photography. If you are a regular user of ND and CPL filters, then this combo might make your efforts a bit easier.