Forum: Pentax DSLR Discussion
04-08-2010, 10:00 AM
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Tried it today on my K-x with PK-M lenses (fully mounted). The P-TTL is working with aperture wide open. However, in M mode, the camera no longer do stop-down metering when the green button is pressed. In stead, the metering is done with aperture wide open and adjusted based on the F number set in camera --- just like A lenses --- which won't be accurate for M lenses.
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Forum: Pentax SLR Lens Discussion
05-16-2010, 08:03 PM
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Forum: Photographic Technique
05-07-2010, 03:50 PM
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Not exactly. The distance from the object to the principle plane must be larger than the focal length otherwise there will be no image on the sensor. If the principle plane is located behind the lens front for more than the focal length then your statement is true.
The bellow, however, can theoretically be of any length.
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