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15 Glossary

15.0 General medium format terms and acronyms

I will add to this list as I come across terms that may not be self-explanatory. It isn’t intended to be definitive.

Coating A layer applied to lens glass surfaces to alter their refractive characteristics. Multi-coating uses more than one coating to correct for different behaviour by different wavelengths (colours) of light.
Parallax The different image content that results from slightly different viewpoints. What you see isn’t exactly what you get.
Pentaprism A five-sided prism (obviously!) that provides an eye-level, right-way up, left to right correct view of the subject.
Taking lens In a twin lens reflex camera, the lower lens used to expose the film.
Viewing lens In a twin lens reflex camera, the upper lens that is used for composition and focusing..
WLF Waist-level finder. The basic ‘flip-up and look down’ finder type. Consists of a folding light shield around the camera focussing screen. Image is right-way up, but left to right reversed.

15.1 Mamiya TLR specific terms

Paramender Mamiya device to move the camera at right angles to the lens axis and parallel to the lens board by 50mm (2”). This moves the taking lens to the viewing lens position to correct parallax at close distance.
Porrofinder A finder that uses mirrors to achieve a right-way up, left to right correct eye level image. Similar in effect to a pentaprism.
Rack and pinion A gearing mechanism that uses a toothed bar or track in conjunction with a toothed roller at right angles to the bar.

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