Five-sided block of glass with mirrored surfaces used to reflect light from an SLR's mirror to the viewfinder's focusing screen. Heavier and more expensive than a pentamirror, but with better light transmission.
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How to clean the focusing system?
Yesterday I was photographing an event and had to change a lot between lenses (50mm and 18-55mm). Surprise, surprise, today when I looked on the viewfinder I saw a little piece of fabric and a little ...
