Daily Archives: October 6, 2019

Nerd Facts on Step-Up Rings, PolarPro, ND/PL Filters, & Knurling

October 6, 2019 in Cameras Gear Reviews & Comparisons / Design Done Right / Nerdy Explanations

Comparison of filter step-up rings from PolarPro, Breakthrough & Fotodiox; a review of PolarPro’s ND/PL Filters & a closer look at knurling usage in design.