Lens barrel and camera system to output data about a focal lengt

Details Lens barrel and camera system to output data about a focal lengt Lens barrel and camera system to output data about a focal lengt

1996-10-15

1999-09-21

Metjahic, Safet

Photography

Flash system responsive to focal length or distance

Illumination angle responds to focal length or distance

396 63, 396 79, G03B 702, G03B 1502

Patent

active

059565306

ABSTRACT:
A lens barrel and a camera system are capable of precisely calculating a photographic magnification and a field range. The lens barrel having a focusing or zooming movable lens unit is stored with effective focal length data corresponding to a position of the movable lens unit, detects the position of the movable lens unit, outputs the corresponding effective focal length data and calculates the photographic magnification and the field range. An accuracy of a calculated value is thereby enhanced enough not to cause an underexposure on the whole or the underexposure in a peripheral portion as compared with a central portion.

REFERENCES:
patent: 5522847 (1996-06-01), Watanabe et al.

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