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Forum: Pentax K-3 & K-3 II
09-02-2017, 11:25 AM
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For portraits, SR or not, you should never get your SS below the 1/FL rule. In fact, FWIW, I usually go by the 2 x FL rule... At 1/30 with a 70mm lens, it's much too slow to get sharp portraits, because your subject are almost never perfectly still, unless shooting a statue. With my 70mm, for portrait I use TAv mode, 1/250 (although I could go to 1/100 with a still subject) and let the ISO float. If the ISO has to be pushed too high, it means it's time to get the flash...
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Forum: Pentax K-3 & K-3 II
09-02-2017, 10:12 AM
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But what shutter speed do you have to used with SR off to get results to your satisfaction ? When I'm talking about 3 stops it's realtive to what I do with SR off, not the old 1/FL rule. This thumb rule comes the film era and is based on what is needed to get an acceptably sharp 8 x 10 print. If you're pixel peeping a 24MP picture, you'll a higher shutter speed since the 1/FL rule could show some blur, although it will not be apparent on the image at normal size and viewing distance.
Also note that 3-stops is pushing the system to its practical limit and you should not expect 100% sharp shots. I have about a 50% success rate with 3-stops SR, but YMMV. So, better take a few shots if when at this limit. But 2-stops is very doable with almost 100% sharp shots. Just for fun, I've tried going down to 4-stops and although shots are of the sharp, but the success rate is so low (something like 5-10%) that it's not of much practical value.
Just for fun, I've just done a quick test in my kitchen and got this, 0.4 second with a 50mm lens, 100% crop:
It's a good 4-stops of SR, even a bit more, with a K-3. But I needed about 5 five shots to get this acceptably sharp one... So, to answer the OP question, I guess this shows that SR in the K-3 works as expected....
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Forum: Pentax K-3 & K-3 II
09-02-2017, 09:03 AM
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I usually got about 3 stops with the K-3. Which is what is announced for the camera. If it's not enough, there are newer bodies like the K-3ii, KP and K-70 having a better system, up to 4.5 stops and just as good as Olympus.
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