Kenko PRO1D Protector N 39mm Lens Slim Made in 395271 (W) Filter, Frame, Japan,

[Constant Protection for Your Valuable Lenses] This high-performance lens protection filter is designed to be permanently attached to your lenses to protect them from scratches, dust, and dirt, protecting your expensive lenses from damage. [Low Reflectivity of 0.3% or Less] The DMC1-II coating offers improved performance compared to the previous model's surface reflection of 0.5% or less. Achieving a low reflectivity of 0.3% or less, it suppresses flare and ghosting caused by filter attachment, maintaining clear image quality. [Minimizing internal reflections] By applying a black coating to the outer edge of the filter glass, internal reflections are minimized. This reduces the occurrence of flare and ghosting when shooting against the light. [Thin frame design compatible with ultra-wide-angle lenses] By making the filter frame thinner than usual, it is designed to minimize vignetting (the phenomenon where the corners of the screen become dark) even when attached to an ultra-wide-angle lens. [Reliable Japanese-made quality and ease of use] Features include knurling (anti-slip) processing for easy attachment and detachment, a design that allows for lens cap attachment, and reliable Japanese manufacturing.