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Forum: Pentax K-3 & K-3 II
09-04-2014, 07:04 AM
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When the lens is set at 'A', the aperture is controlled electronically from the camera. The K-3 has aperture and shutter control on the body, use them.
When the lens is set away from 'A', then you control the aperture on the lens - but the camera does not have the mechanical linkage to measure the chosen aperture - so it can't display your chosen aperture and that is why the F-- is flashing. Older cameras - pre the digital era - had this mechanical linkage to measure aperture. No Pentax DSLR's has it. You can still take pictures, in manual mode on the camera, but the metering is not engaged automatically. You can activate the metering for the chosen aperture on the lens and this way getting a shutter speed. But this is a bit more fiddly than to leave the lens at 'A' and using the in-body controls. You also has more metering options with lens set at 'A'.
The reason for the Tamron lens to have an aperture ring, is to stay compatible with older film cameras - pre the digital era. The aperture ring is not needed on a Pentax DSLR, but can be handy on older film cameras from the 90's or even older than that...
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