Hoya 46mm Yellow K2 Multi Coated Glass Filter Smith Optics Some of the many applications

Some of the many applications include sound reinforcement speakers for DJs

It can also be operated via USB bus power

The large EARasers Musician's HiFi Earplugs are designed to protect your hearing at concerts

Ilford's Delta 400 Professional is a high-speed black and white negative film featuring core-shell crystal technology in order to produce high sharpness with a fine

with up to two users per channel

Hoya 46mm Yellow K2 Multi Coated Glass Filter Smith Optics Some of the many applicationsHoya 55mm Yellow #K2 (HMC) Multi Coated Glass Filter commonly used for a noticeable increase in contrast with black and white films. Especially useful for clear contrast between blue sky with clouds and foreground. It is also suitable for landscapes and nature scenes. Multicoated to minimize reflection at the filter surfaces which reduces flare and ghosting.