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Shutter Shake Evaluated at 140mm, Siemens Target
Update Sept 2016: Pentax adds EFC shutter option via firmware update.
Shutter vibration aka shutter shake is vibration caused by the shutter itself, even if the mirror has been locked up. The Sony A7R suffered severe problems with shutter vibration, resolved with the 2nd generation Sony A7R II.
In general, the longer the focal length and/or the more unstable the 'rig', the more serious a problem shutter vibration is.
While the Pentax K1 uses an Electronic First Curtain Shutter (EFC Shutter) for its SuperRes mode (lack of it would render the feature useless!), neither the K1 nor its K3 II sibling offers and EFC shutter option for zero vibration exposures.
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Diglloyd DAP is DSLR-oriented, but also contains workflow and other topics. Much of the focus is on Canon and Nikon but also Pentax and Pentax medium format.
Special emphasis is placed on lens evaluation, focusing on Canon and Nikon and Sigma lenses, but with a few others like Rokinon/Samyang.
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