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Pentax 645 UB-21 Split Image Matte focusing screen Review RSS Feed

Pentax 645 UB-21 Split Image Matte focusing screen

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0 75 Tue November 13, 2018
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Pentax 645 UB-21 Split Image Matte focusing screen


Description:
Pentax UB-21 Split-Image Matte focusing screen
This is an accessory focusing screen intended for the original 645 camera body. It is described as a general purpose screen that includes a prism angle of 6 degrees. Prism size is probably 3.5 mm as in the UC-21. Pentax notes that when used with a lens aperture under f/5.6, the plain matte area is utilized for focusing. This is a characteristic of split image prisms. The "U" screen series has a different edge tab arrangement than for later 645 series screens and is not believed compatible with the later bodies.


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