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Forum: Pentax DSLR Discussion 04-08-2010, 10:00 AM  
Any way to reduce on-board flash output with manual aperture lenses?
Posted By xjx
Replies: 9
Views: 4,656
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.
Forum: Pentax SLR Lens Discussion 05-16-2010, 08:03 PM  
No aperture control
Posted By xjx
Replies: 14
Views: 2,658
You are welcome :)
Forum: Photographic Technique 05-07-2010, 03:50 PM  
How much magnification can a given lens give in macro photography?
Posted By xjx
Replies: 5
Views: 6,195
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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