Do older K-mount lenses have a cropped field of view on the Pentax K-01?
Asked 6/2/2013
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If I mount an older K-mount lens designed for 35mm film on a Pentax K-01, will it keep the same field of view as it had on film? For example, would a 50mm lens behave like a 75mm lens because of the K-01's APS-C sensor?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
13y ago
2 Answers
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The lens will function as a 50mm lens. The sensor has a aps-c crop factor 1.53 sensor, which will give you a FOV as a 76.5mm lens on a 35mm sensor.
I might add that I use the k-mount pentax 50mm 1.4 on my 1.6x crop factor camera and it is a very nice and convenient combo.
Originally by user11455. Source · Licensed CC BY-SA 4.0
user11455
13y ago
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Generated from our catalog & community — verify before relying on it.
The lens remains a 50mm lens, but on the Pentax K-01 its field of view is narrower because the camera uses an APS-C sensor. The K-01’s crop factor is about 1.5x, so a 50mm lens gives a field of view similar to roughly a 75–76.5mm lens on a 35mm film or full-frame camera.
So:
- focal length: still 50mm
- field of view: equivalent to about 75mm on 35mm/full frame
This happens because the smaller sensor captures a smaller central portion of the image projected by the lens, which makes the scene look more tightly framed.
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