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Chinon AF 50 mm f /1.7 Lens

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Chinon AF 50 mm f /1.7  lens

Chinon AF 50 mm f /1.7  lens

Chinon AF 50 mm f /1.7  lens

Chinon AF 50 mm f /1.7  lens

Format: 35mm SLR

Type: Prime lens

Focusing: Auto Focus (AF)

Lens mounts: Pentax K

First year of production: 1982

Optical design: 6 elements in 5 groups

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Owners (2)

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Average price:

Specifications:

Focal lengthMax. apertureMin. apertureBladesMin. Focus (m.)Filter Ø (mm.)Weight (gr/oz)Length (mm/in)
50mmf/1.7f/22 158425/1554/2,1

Additional information:

The Chinon AF 50 mm f /1.7 is the first serial lens equipped with the the infrared autofocus system.

Autofocus operations start after pressing a big yellow button on the left side of the lens.  Then, as is seen from the scheme, an infrared Light Emitting Diode (E) is turning in the direction of a receiving sensor (S) until it receives the beams reflected back from the object (O).

http://lens-club.ru/public/files/users/image/af_ir_s.jpg

Since the emitter and the lens are linked mechanically, the angle of deviation is in accord with the focusing distance. Successful focusing is indicated with the green LED and audible signal.

Infrared beams are well absorbed by any dark object and and reflected by a light-colored one, that's why the attempts to take a photo of a person in black suit with a white stone as a background may confuse the focusing system.


Posted by: nukemall   Date of publication: 06.03.2011


Mechanical quality2.502
Optical quality4.002
Usability1.002
Pricing / Value3.002
Bokeh3.002
Overall lens rating
2.70

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