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06-30-2014, 04:23 AM   #1
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Shake reduction & UWA lenses

Do you think or have you experienced any adverse SR effect when shooting with ultra wide angle lenses like 10mm and scene with a lots of small detailing ?

Yusuf

06-30-2014, 04:48 AM   #2
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The Samyang 14mm is exposed to a potential problem because on most Pentax DLSRs you cannot input 14mm as the focal length. If you choose 15mm, the SR can overcompensate, though, and cause blur. So I prefer to choose 12mm. But when I use my UWA I almost always turn off SR, since UWA means you can have a pretty long exposure if your hands are steady. Best is with tripod and 2 sec timer, which automatically turns off SR anyway.
06-30-2014, 05:45 AM   #3
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QuoteOriginally posted by Na Horuk Quote
The Samyang 14mm is exposed to a potential problem because on most Pentax DLSRs you cannot input 14mm as the focal length. If you choose 15mm, the SR can overcompensate, though, and cause blur. So I prefer to choose 12mm. But when I use my UWA I almost always turn off SR, since UWA means you can have a pretty long exposure if your hands are steady. Best is with tripod and 2 sec timer, which automatically turns off SR anyway.
Actually it's Sigma 10-20 so inputting focal length was not an issue. The shutter speed was > 1/250s. However, pictures seems to have blur when SR was ON, especially in shots with minute details like trees, leaves etc, pictures with SR off are acceptable though. The blur is not so noticeable for larger objects even when SR is ON.
06-30-2014, 06:03 AM   #4
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I have this lens and have not noticed any issues. Perhaps if you post a few samples it would assist in diagnosis.

06-30-2014, 06:05 AM   #5
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There's no substitute for good technique. Must like a cell phone, at one time, there was no such thing.
06-30-2014, 06:10 AM   #6
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Not at all.... I shoot with a Sigma 8-16 from time to time, but then, I often shoot on a 2 second times and a tripod and SR is turned off. From time to time I do use the 8-16 for candid off tripod type images and it works fine.

Hand held, ƒ8 , 11mm , 1/2000, no noticeable loss of detail.


SIgma 8-10 @8mm 1/1000s, SR on, razor sharp, even pixel peeping... it has gat that funky wide angle distortion on the edges look though...heavy correction doesn't end distortion, it just gives you different distortion.
06-30-2014, 06:32 AM   #7
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QuoteOriginally posted by normhead Quote
SIgma 8-10 @8mm 1/1000s, SR on, razor sharp, even pixel peeping... it has gat that funky wide angle distortion on the edges look though...heavy correction doesn't end distortion, it just gives you different distortion.
Possibly a k-x specific issue, I no longer have any Pentax DSLR to try this out again but this was the observation while looking at some old pictures. Also, as I said, it's very evident when there are minute details like leaves, far mountains with trees, etc but not on larger objects. Will post some pictures later.
06-30-2014, 07:15 AM   #8
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K-X shake reduction took some time to lock in. Not an issue once you got used to it but if you shot before SR stabilized you could get blur. I have not noticed this on newer bodies.

06-30-2014, 10:28 AM   #9
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QuoteOriginally posted by jatrax Quote
K-X shake reduction took some time to lock in. Not an issue once you got used to it but if you shot before SR stabilized you could get blur. I have not noticed this on newer bodies.
Good point. So I checked with PhotoMe and it shows SR was stabilized in all the shots so that doesn't seems to be the problem.
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