Kase K150P Magnetic Circular Polarizer Filter - 150mm Clip-On Filters At the top they have

At the top they have top-flap that secures with two simple press-studs

a 6x17cm back can be used with it

Billingham Luggage Tally - Black Leather / Nickel Coated Brass Buckle

When to Use a ND4 Filter

Multi-Coated

Kase K150P Magnetic Circular Polarizer Filter - 150mm Clip-On Filters At the top they haveKase K150P Magnetic Circular Polarizer Filter 150mm Key Features Circular Polarizer Filter For Kase 150P Filter Holder Helps Eliminate Reflections and Glare Reduces Haze in Landscapes Improves Color and Tonal Saturation 150mm Diameter x 1. 5mm Thick Optical Glass Magnetic Metal Filter Ring Leatherette Case with Magnetic Closure This Kase KP150 Magnetic Circular Polarizer Filter 150mm helps reduce reflections and glare by filtering out light that has