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01-03-2010, 03:36 AM   #1
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K-x SR test

Did some test on SR, feels that it works best in the range between 1/20s to 1/50s, but doesn't work as well around from 1/60s to 1/100s. When it's above 1/100s, it seems that it's better to turn it off. Therefore, the shutter speed around 1/100s is a bit awkward since SR doesn't help much and the speed is not fast enough to avoid it. I don't know what you guys found about this.

01-03-2010, 03:54 AM   #2
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QuoteOriginally posted by dude2009 Quote
Did some test on SR, feels that it works best in the range between 1/20s to 1/50s, but doesn't work as well around from 1/60s to 1/100s. When it's above 1/100s, it seems that it's better to turn it off. Therefore, the shutter speed around 1/100s is a bit awkward since SR doesn't help much and the speed is not fast enough to avoid it. I don't know what you guys found about this.
Please let us know the focal lengths you used to test this.

SR effectiveness is related to the focal lengths used.

eg: 1/100 sec would be slow for a 500mm lens - SR would be very useful -
and if it were ineffective, then that would be a major failing.....
01-03-2010, 06:43 AM   #3
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I think that the focal lenth of the lens has a lot to do with how the shake reduction works as Vincent says. When you fit a non AF lens on my K10D it askes you for the focal lenth of the lens so it can work out the SR settings. I have found this to work well with a 400mm mirror lens I once had. I suspect that with the standard zoom lens fitted that the SR may turn itself off or be less sensative at 1/100s as this shutter speed is mostly fine for this type of lens. Try it with a long lens if you can.
01-03-2010, 07:40 AM   #4
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The main thing that changes in Shake Reduction depending on focal length is the speed of the sensor. With a 50mm lens the sensor moves the same distance in 1/50s as in 1/500s with a 500mm kens.

01-03-2010, 12:30 PM   #5
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That is true, I was testing at 200mm and 300mm (equivalent to 300 and 450 for 35mm). So it has to use speed above 1/200 without SR, actually, I was glad to see that SR works well for 1/20s at 300mm. Even though, it's not perfect for all the speed steps.
01-03-2010, 02:34 PM   #6
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QuoteOriginally posted by dude2009 Quote
Did some test on SR, feels that it works best in the range between 1/20s to 1/50s, but doesn't work as well around from 1/60s to 1/100s. When it's above 1/100s, it seems that it's better to turn it off. Therefore, the shutter speed around 1/100s is a bit awkward since SR doesn't help much and the speed is not fast enough to avoid it. I don't know what you guys found about this.
Have you seen this thread?

Are we seeing a pattern? K-x soft with shutter speeds around 1/100 to 1/200?

I did a casual ad-hoc test out in the cold (so lots of body shake? ) in that thread
and I didn't seem to have any problems at 1/100 and 1/160 sec using about 45mm and 28mm actual focal length respectively
(those 100% actual pixel crops should have EXIF attached -
but for some reason PhotoBucket appears to have "lost" the EXIF -
it's happened now to several of my photos.....)
01-03-2010, 03:02 PM   #7
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QuoteOriginally posted by UnknownVT Quote
Have you seen this thread?

Are we seeing a pattern? K-x soft with shutter speeds around 1/100 to 1/200?

I did a casual ad-hoc test out in the cold (so lots of body shake? ) in that thread
and I didn't seem to have any problems at 1/100 and 1/160 sec using about 45mm and 28mm actual focal length respectively
(those 100% actual pixel crops should have EXIF attached -
but for some reason PhotoBucket appears to have "lost" the EXIF -
it's happened now to several of my photos.....)
Well, I don't really find a pattern there. At any shutter speed, I still get a reasonable amount of good shots. It's just that for certain speed at certain focal length, the failure rate is higher. But I still have more 50% of good shots in those situations.
01-03-2010, 03:07 PM   #8
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QuoteOriginally posted by dude2009 Quote
Well, I don't really find a pattern there. At any shutter speed, I still get a reasonable amount of good shots. It's just that for certain speed at certain focal length, the failure rate is higher. But I still have more 50% of good shots in those situations.
Do you have a list of combination of focal lengths and shutter speeds where you found the SR less effective?

01-03-2010, 09:16 PM   #9
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QuoteOriginally posted by UnknownVT Quote
Do you have a list of combination of focal lengths and shutter speeds where you found the SR less effective?
Sorry, I didn't spend that much time to make my test more scientific. All I can tell is, SR works pretty well at lower shutter speed, but it's not fully effective all the time. Actually, one thing interesting i found in the manual is that it recommends SR to be turned off when a tripod is used. I actually don't know why.
01-04-2010, 07:55 AM   #10
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I have some 18mm F8 1/400 ISO200 (and faster shutter speeds) shots with SR on. It's a major fail. The images were blurred like 3-4 superimposed images that are mis-aligned.
01-04-2010, 10:35 AM   #11
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QuoteOriginally posted by buliwyf Quote
I have some 18mm F8 1/400 ISO200 (and faster shutter speeds) shots with SR on. It's a major fail. The images were blurred like 3-4 superimposed images that are mis-aligned.
Didn't happen without pics.
01-04-2010, 10:38 AM   #12
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If so, buliwyf, that´s a problem, and very much atypical. Please post some examples, otherwise you´re not really adding anything useful to discussion.
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