0 Talk Loupe Edit History Glossary Terms folding rectangular loupein an Exa 1a waist-level finder A loupe is a small, mounted magnifying glass; sometimes fitted in cameras (e.g. TLRs) to magnify the viewfinder screen as an aid to focusing. Loupes are also used to examine negatives. Read more In 1892 the red window was introduced by the Boston Camera Manufacturing Company as a means to... Red window The film plane is the plane in which the film (or the electronic sensor) is placed. In a... Film plane A selenium meter is a light measuring instrument. The most common usage of such light meters is... Selenium meter Related Categories Categories: Glossary | Camera parts Add category