BRAUN ProLine POL-Filter 67 mm

The multi-coated glass really keeps reflections off water surfaces without washing out colors, and the slim ring means I don't get vignetting even at 16mm. Twist is smooth but has enough resistance to hold my setting while hiking.

The low-profile design is a lifesaver for my ultra-wide lens — no more vignetting even at 16mm. The threads are butter-smooth to screw on, and the image sharpness stays excellent.

The multi-coating on the glass really cuts reflections without any color cast that I've noticed. I've used it on a few wide-angle shots and the slim frame means zero vignetting even at 16mm.