Well, turns out i am considering now not to return my K1, after all. For a couple of reasons: 1) So far, all photos seems quite Ok, including the ones with SR turned on (well focused images with a M 50mm, @ f2.8 and 1/8, handheld - ins't this ok?). 2) Then, reading a lot on the internet, i now understand this is a well known issue for over 10 years now and not only among Pentax cameras but also, as @rawr points out, among Olympus, Sony etc. and one can conclude that there are a lot of photographers that did note the issue but also ones that did not (this may be due to manufacture variances, or that the cameras somehow change over time or even just that there are persons that may feel this kind of things but others do not). Hope i am doing the right thing...
Now, having started this thread, as a little effort for others that, as myself, may now be entering the Pentax system or IBIS / SR systems and know nothing about this issue, here it is what i think i have learned: The SR system does mean that there is a loose part inside the camera (the sensor and whatever it is fixed to) and while it is not activated it then moves freely as we tilt the camera (i would guess about 2 mm or so). The thing is it moves regardless the camera is turned off or turned on and actually regardless the SR is also on or off, because, and this is the the thing i just have learned, the SR is ONLY ACTIVATED AFTER THE SHUTTER BUTTON HAS BEEN HALF PRESSED (i just tested this and it is a fact), which also explains why in Live View mode, there is not any moving part: So, as a conclusion, it seems that the SR is only activated (the magnets, or whatever technology, are energised) thus holding the sensor, at the moment of taking a picture (or at LV mode, in which case the mirror is up, as if in the process of also taking a picture).
Hope this makes sense, it makes to me.
Now, it's time to learn the K1 manual and go through little (but important) decisions, such as: Which file format to choose (i think i will stay with PEF), which software to use (i think i will be using digiKam and darktable - so, open source route) and also which computer system (possibly a new Mac Mini paired with a monitor, like an entry leve Benq or such). And, above all, it's time to keep learning photography (i am an amateur on the matter).
Last edited by Fernando Sousa; 11-03-2019 at 07:08 PM.
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