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Forum: Pentax K-3 & K-3 II
07-11-2015, 03:49 AM
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Just the explanation
1/180s is the fastest shutter speed at which both curtains of the shutter are open at the same time; this is the so-called X-sync. This allows the flash light to cover the full sensor. At e.g. 1/250s, one curtain will not be fully open at the moment that the flash fires. The result will be a picture with a dark band.
Pentax thinks that dSLR users are stupid and need to be protected against themselves :(
If you need a flash at higher shutter speeds, you need to use a HSS capable flash.
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Forum: Pentax K-3 & K-3 II
07-09-2015, 02:31 PM
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Forum: Pentax K-3 & K-3 II
07-09-2015, 12:22 PM
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make sure you're at 1/180 or less
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Forum: Pentax K-3 & K-3 II
07-09-2015, 08:56 AM
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First, follow this to set them up, should be mostly the same for Yongnuos, and see if that makes a difference:
You Tube
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src="https://www.youtube.com/embed/EFchyocdQRI?controls=1" allowfullscreen>
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If they're not firing at all, either they don't have batteries in (doubtful), they're defective (also doubtful you'd get a batch of bad pieces), or your shutter speed is faster than the allowed limit of 1/180 (most likely).
---------- Post added 07-09-15 at 11:00 AM ----------
After you ensure they are not all defective, you want to pair the flashes to the control unit. Basically follow this for a Yongnuo specific setup:
You Tube
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src="https://www.youtube.com/embed/jstC9p508Io?controls=1" allowfullscreen>
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