Rui Salgueiro's field-of-view calculator

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Focal lengths of lenses

135 normal (24x36 mm) panorama (14x36 mm)
120 6x6 (56x56 mm) 4.5x6 (41.5x56 mm) 6x7 (55x70 mm)
digital medium-format Pentax 645 (33 x 44 mm) H5D-50 (36.8 x 49.1 mm) H5D-60 (40.2 x 53.7 mm)
APS H (16.7x30.2 mm) C (16.7x25.0 mm) P (10.0x30.2 mm)
digital APS-C 4/3 (13.0 x 17.3 mm) Canon (14.9 x 22.3 mm) Pentax, Nikon, Sony (15.7 x 23.7 mm)
large 4x5 (101.6x127 mm) 5x7 (127x177.8 mm) 8x10 (203.2x254 mm)
other (mm) width (mm) length

Note 1: This calculator is only valid for flat films formats. It can't be used to calculate the field-of-view of a true panoramic camera with rotating lens.
Note 2: The sizes for 4.5x6 and 6x7 are the ones used by Pentax. Other brands may have slightly different sizes.
Note 3: The sizes for large format are the nominal sizes. I think the usable size is slightly smaller, but I don't have the exact sizes.

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