Infra-red filter creates eerie snow effect.
Magnus, the faithful camera clubhouse cat, thoughtfully dropped a B+H gift card in my Christmas stocking. I used the card to order an Infrared (IR) filter which, as you will remember knocks out all wavelengths of light below the filter rating. In this case, all light below 930nm doesn’t make it through the filter, and the wavelengths that do make it require 2 1/2 minutes of exposure time. This filter is so dark red, the composing and focusing must be done before the filter is attached to the front of the lens. In addition to a tripod and ballhead, it helps to have gloves and a mug of some type of warm liquid to keep hands and insides warm while walking around behind the camera for those 150 seconds while the shutter is open.
IR filters come in varying strengths which affect the price. Mine wasn’t priced in the low-end promo department, but the effects it creates are both enjoyable and worth the price. Get one and see for yourself.