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04-27-2008, 03:16 PM   #1
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K20D Flash Synch Quirks

The K20D is a very nice camera. It has a few quirks that aren't mentioned in the manual.

If your battery is getting low, the external X connector will not fire, but the onboard flash will.

Using onboard or the external flash options, flash will not fire anytime the shutter exceeds 1/180 second. So much for experimenting with faster flash speeds unless you buy the pentax flash units (a little underpowered for my needs).

Flash speed is a true 1/180 second or slower. If you are getting bars from the shutter it is because your flash duration is longer than the maximum speed allowed for external flash. Just like any 35mm camera. Haven't yet checked the maximum speed with any of the pentax dedicated flashes which electronically can enable a faster synch speed.

Works well with studio lighting provided the above conditions are met.

Can't seem to get the trailing shutter speed to work properly. Pentax tech support was a little disbelieving on this one. Not a big deal, but since they show it in the manual, it would be nice if it worked. In auto mode, using onboard flash, mine fires the preflash first and exposes on the preflash. In bulb, manual, or X, it flashes at the begining of the exposure without being able to change it to the end (trailing shutter). Using external flash, it is the same in bulb, manual and X. Don't know if it is a software problem or what.

Not yet tried with wireless transmitters.


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bulb, camera, dslr, fire, flash, flashes, onboard, pentax, photography, preflash, shutter, synch
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