My test of shutter shock on K-3 III

[MarBa]

"Either I don't really reach the ultimate sharpness .. or my camera does not have this problem"
I'm not sure I follow you here. Are you saying these photos could be sharper? Please clarify.

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http://www.flickr.com/photos/donkiyoti/

I'm just not sure if I would see the same problem as they did using my test. For example, if my images were all a bit less sharp then I would not see the additional blur due to shutter shock. That could be one explanation of why I don't see what they saw.

But the alternative explanation is that the shutter shock is visible only in certain combination of lenses and speeds and tripods.

I don't have time to test the same way additional lenses. Maybe others could. I don't have the 55/1.4 lens for example.

I think the settings were probably fine on their camera. They know what they are doing!

Or .. their camera has some issue. That would be bit worrying.

 

[MarBa]

Yeah, DPR screwed it up again.

I don't think so .. it's probably certain combination of lens, time and tripod that will result in this problem.

I am sure they know how to setup the camera and they clearly tried a lot of different things.

Maybe they just need another lens.

Good news is that this does not seem to be a general problem.

 

[MarBa]

You took these images in LV.....was the Electronic shutter enabled ?

There is no electronic shutter in K-3 III. When you take an image from LV, it's like a normal exposure. Shutter closes first and mirror goes down to end LV .. then the mirror goes up for 2s because of the timer and then you get an exposure by moving shutter. ... Well at least that is what I think is happening. It's definitely quite an elaborate procedure.

The mirror shouldn't cycle in LV shooting. Since K-7 the flagship cameras used the separate mirror, shutter and aperture motors to keep the mirror up in live view. You can check this by looking in the OVF when you press the shutter, no light should be visible if the mirror stays up.

What you're hearing with LV is (1) the shutter closing (second curtain) and the aperture stopping down and then (2) the shutter opening and closing (the two curtains traveling) to take the picture and finally (3) the first curtain of the shutter opening once more (and possibly the aperture too, depending on settings and light level), to allow LV again. The self-timer is inserted between steps (1) and (2).

Thank you for your explanation!

 

[MarBa]

Inspired by what ozdean and JeremieB have seen in this thread:

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Which describes how corners can get blurry under certain conditions, I went back to my tests and looked at the corners of my images.

What I can see is that if the horizon correction is OFF, all corners (as well as center) are perfectly sharp, not sign of blur.

BUT ... if the horizon correction is ON, corners may get blurry at some exposure times!! (but not center, only corners)

This is likely a different problem than the one that DPR has seen in their tests where the center was blurred under certain exposure times.

It is still a bug and it should be fixed!

Please have a look here for more discussion and contributions from ozdean, JeremieB and jonby:

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www.dpreview.com

Best,

M