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02-16-2011, 02:18 AM   #1
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K-5 vs K-7 shutter induced shake?

I have been tinkering with the idea to replace my K10D as it seems that the AF is "traveling" again. K-7 seems to be very reasonable compromise between IQ, speed of AF and ISO at the moment. But the story of shutter induced shake at around 1/100 with wide/UWA lenses is somewhat putting me off (although currently my widest lens is 24mm so I don't know how much it would affect me). Now K-5 uses the same body or not? So, does it suffer from the same issue or not?!?

02-16-2011, 02:29 AM   #2
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Maybe Falk is the answer to this, as he is the only one i can think of pulling of a accurate test of the matter. As he did with the K-7.

Personally i never seen it, on the K-7 or the K-5, but there sure exist evidence of it!
02-16-2011, 02:31 AM   #3
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My K7 suffered from shutter shake... Sometimes, I'd simply gave up trying to shoot some simple landscape with a 20-ish focal length in full day because I consistently had shake at 1/125 and could not understand how it was possible, given that I was at twice the recommended 1/1.5xFL handholding speed (and ironically, the more I tried to stabilize myself, the more pronounced the shake was!). With portrait orientation, FL<35mm and 1/125 speed, I'd say I had a good chance to end up with a blurred pic.

Granted, it was before this whole thing was exposed, so now I would just up the ISO a little to clear the dreaded 1/125.

But what really bothered me is that with manual lenses and auto-iso, the K7 always choose a 1/100 speed floor, whatever focal length you use...
So you end up in the worst situation possible...

With the K5, I simply never noticed any unexplained blur...

But the problem can be avoided on the K7, for example by setting Auto-iso to "fast" with manual lenses so it will favor 1/200 as a low limit (or "slow", with a 1/50 limit)... But it's quite an hassle IMO...
02-16-2011, 04:33 AM   #4
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I have the shutter caused blur with K-5, even at 1/320. The AF is very inaccurate in lowlight conditions, it's two. The only thing that satisfies me completely is wide DR.

02-16-2011, 05:29 AM   #5
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Impressive about the Blur even at 1/320 even more because Falk testet die K5 in the same way as the K7 and the "Blur" effect hast been reduced in many Situations and i think 1/320 was not even been on the measuring scale, so maybe it might be another problem.

Mybe you got on eof this faulty lowlight FrontFocus K5's out there...
Some Rumors hind to any FW-Update this month to solve that problem.
02-16-2011, 11:32 PM   #6
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http://img-fotki.yandex.ru/get/5300/denis-cheremisov.2e/0_476e9_f0698cd4_orig — that's an example
About AF — I found it to be better in earlier firmwares. Something went wrong with latest ones.
Luckily, the problem disappears with SR system off )
02-17-2011, 12:44 AM   #7
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I have rather bad example of shutter blur on my K10D. I never saw it on K-7 or K-5.
02-17-2011, 05:01 AM   #8
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Whatever people are seeing at 1/320 second, it isn't the "shutter induced blur" that Falk wrote about on the K7. That was something that was seen specifically between shutter speeds of 1/50 to 1/100 seconds. Per his testing, it was significantly improved on the K5 (Falk Lumo: LumoLabs: Pentax K-5 shutter).

I can honestly say that I haven't had issues with my K7 and shutter induced blur, for what it is worth.

02-17-2011, 08:02 AM   #9
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QuoteOriginally posted by Rondec Quote
Whatever people are seeing at 1/320 second, it isn't the "shutter induced blur" that Falk wrote about on the K7. That was something that was seen specifically between shutter speeds of 1/50 to 1/100 seconds. Per his testing, it was significantly improved on the K5 (Falk Lumo: LumoLabs: Pentax K-5 shutter).

I can honestly say that I haven't had issues with my K7 and shutter induced blur, for what it is worth.
I frequently issued in such a problem with SR on. And have met it with SR off. So, it's kind of SR problem again.
02-17-2011, 11:03 AM   #10
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QuoteOriginally posted by Emacs Quote
http://img-fotki.yandex.ru/get/5300/denis-cheremisov.2e/0_476e9_f0698cd4_orig — that's an example
About AF — I found it to be better in earlier firmwares. Something went wrong with latest ones.
Luckily, the problem disappears with SR system off )
Can you post example with SR off? Thanks
02-17-2011, 02:16 PM   #11
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QuoteOriginally posted by Emacs Quote
http://img-fotki.yandex.ru/get/5300/denis-cheremisov.2e/0_476e9_f0698cd4_orig — that's an example
About AF — I found it to be better in earlier firmwares. Something went wrong with latest ones.
Luckily, the problem disappears with SR system off )
The exif info says the lens has a focal length of -1mm. If that is what the camera thought (and not something that has happened in pp) I can understand why the SR system might be a little confused.
02-18-2011, 05:06 AM   #12
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02-19-2011, 09:24 AM   #13
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QuoteOriginally posted by Gimbal Quote
The exif info says the lens has a focal length of -1mm. If that is what the camera thought (and not something that has happened in pp) I can understand why the SR system might be a little confused.
I wrote a bullshit )
I meant: shutter caused blur disappears when SR off. The example:
http://img.fotki.yandex.ru/get/5704/denis-cheremisov.33/2_uljr78+IyTex8mU3a8..._ee69859b_orig
I noticed SR works particularly bad when the camera back is not in perpendicular plane to the earth. The focal range is not a problem at all. The camera knew it, but I used DNG which my RAW converter (Darktable) was unable to extract FR from. But it properly determined EFR (115mm, it was FA 77Ltd).
The AF got worse since 1.00. I found it to be much more reliable with the 1.00 than with both 1.01 and 1.02.

Last edited by Emacs; 02-19-2011 at 09:33 AM.
02-19-2011, 02:07 PM   #14
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