Hoya Fog B Diffuser Filter for Fog Effect Choose Filter Size:58mm - $20.90 This makes it impossible to

This makes it impossible to use the same 3mm thick frame as the smaller sizes

Due to the nature of infrared light

The 25A blocks over 90% of the light below 650mn

Reducing overall contrast

Hoya Fog B Diffuser Filter for Fog Effect Choose Filter Size:58mm - $20.90 This makes it impossible toDescription The HOYA FOG filters have a frosted surface that lightly veils the entire picture in a pleasing dreamlike fog effect. There are two Hoya FOG filters, a FOG A and the stronger FOG B. Both can be used together to produce an effect similar to dense fog. The effect can be varied by changing the aperture of the lens, but stopping down too far will reduce the effect. These two filters are also available as a set. Specifications Filter Factor: N