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10-08-2010, 10:15 PM   #1
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Shutter Blur: K7/K5?

Okay, I just got a whiff of this, which is probably old news, but in that I'm planning to upgrade to the K5 from the K20D, it kind of scares me. Apparently, the argument is that the free floating sensor of the K7, and presumably, the K5 creates blur at certain shutter speeds. Tell me it isn't so.

Michaael

10-08-2010, 10:21 PM   #2
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When the K-5 is released and tested (presumably by Falk Lumo), we will know. Until then, no way to test one and answer your question.

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10-08-2010, 10:37 PM   #3
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It ain't an automatic consequence of having a free-floating sensor. After all, the K20D has one of those too. It comes with having sensor-shift shake reduction.

With the K-7, and K-x, the 'blur issue' was only claimed to occur within a narrow range of shutter and focal length combinations. Let's wait and see if anyone claims this is a problem with the K-5.
10-08-2010, 11:57 PM   #4
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QuoteOriginally posted by skyoftexas Quote
Okay, I just got a whiff of this, which is probably old news, but in that I'm planning to upgrade to the K5 from the K20D, it kind of scares me. Apparently, the argument is that the free floating sensor of the K7, and presumably, the K5 creates blur at certain shutter speeds. Tell me it isn't so.

Michaael
Nobody will really know until the K-5 is out and tested.
HOWEVER, two things I can say for sure.
One, There is no evidence that this is a consequence of a free floating sensor design, or unsolvable in a free sensor design.

Two, "presumably, the K-5" is a bit far-fetched.
If the problem was unknown or underestimated during the design stage of the K-7, that is one issue. Once the problem is known, and engineering resources are put to it, such little vibrations are not rocket science to solve.

The key word is "known problem" or "foreseen potential problem".

In the industry I work in, potential vibrations of higher frequency and far more powerful are routinely solved by engineers at the design stage.

10-09-2010, 04:37 AM   #5
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Never had the issue with my K7.
10-09-2010, 05:34 AM   #6
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Never had this issue with my K7 too!
10-09-2010, 05:47 AM   #7
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Never had this issue with my K7 too!
10-09-2010, 09:37 AM   #8
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What issue? You mean all this time I've been blaming the environment for my crappy macros and instead it's been the Camera?



10-09-2010, 12:46 PM   #9
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QuoteOriginally posted by rawr Quote
It comes with having sensor-shift shake reduction.
No. The K20D uses the same principle and doesn't have the issue to the same extent. There is some interaction between shutter-induced vibrations and shake reduction but without the vibration there wouldn't be a problem.

Apparently the K-7 shutter wasn't optimally damped. From Photokina images of the K-5 innards it seems that this has been addressed.

It was a very small blur at a narrow range of shutter speeds anyhow. Normally other factors will cause greater blur. Other cameras probably have it too to some extent, but rarely does it get examined as thoroughly as Falk and his team did (The Olympus PEN E-P1 had the same issue and received a new firmware). Still, it reduced (not eliminated) the chances of getting a tack sharp images at certain shutter speeds so it would be great if the K-5 cured this.

Last edited by Class A; 10-09-2010 at 12:51 PM.
10-09-2010, 07:48 PM   #10
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At what shutter speeds and focal lengths does the K-7 typically blur?
10-09-2010, 08:29 PM   #11
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QuoteOriginally posted by FullertonImages Quote
At what shutter speeds and focal lengths does the K-7 typically blur?
I've not been able to deliberately reproduce it in my photos, so I can't say from personal experience.

Its reportedly from 1/80 - 1/150 secs, with the peak at 1/100 secs.
10-09-2010, 09:20 PM   #12
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just give the OP the damned link fer gawds sakes:

Falk Lumo: LumoLabs: Shutter-induced blur with an SLR camera

Now you can read it, see where the issue is and go from there. but as others mention we won't know until, well, we know. Depends on how much time Falk and those he works with have to devote to the testing and verification of their results and testing methods.
10-17-2010, 01:21 AM   #13
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Any news on shutter-induced blur from our new k-5 owners?


It may be at the same shutter speeds as the K-7, but it could be at any shutter speed.
10-17-2010, 01:38 AM   #14
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I'm not seeing any issues here, where there are a few shots in the supposed 'danger zone' for blur:
https://www.pentaxforums.com/forums/pentax-dslr-discussion/118504-k-5-da-35mm...ny-photos.html

or in any of the other K-5 shots showing up around here and on the web.
10-17-2010, 03:59 AM - 1 Like   #15
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Relax........I had VERY few such issues with the K-7 , though some may have more.
My only worry was if the Pentax engineers had totally overlooked the matter in the K-5 design.
If they put it on any sort of FMEA checklist, I'm pretty sure the problem's killed and gone. Real engineers who know about vibration mitigation will understand what I'm talking about.

There are a few heated threads in the "Other" well known Pentax forum, pseudo engineers asserting its an inherent and unavoidable problem with the floating sensor SR design - and they are way off mark.
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