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07-08-2015, 02:47 AM   #1
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K-S2 No sync pulse using M when above 1/160

I understand how a Focal Plane Shutter works and max sync speed. I do not understand why even while using M and a manual flash, the flash sync signal is turned off when shutter speed is set above the sync max speed. I thought the point of manual, was to allow you to do what you wanted.

07-08-2015, 03:26 AM   #2
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Some people do complain about this limitation, but it doesn't change the fact that the maximum sync speed is 1/180s (change your EV steps if M mode is cutting you off at 1/160). You currently need a HSS flash to go higher, essentially.

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07-08-2015, 03:44 AM   #3
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QuoteOriginally posted by Adam Quote
Some people do complain about this limitation, but it doesn't change the fact that the maximum sync speed is 1/180s (change your EV steps if M mode is cutting you off at 1/160). You currently need a HSS flash to go higher, essentially.
Agree, but if a flash can discharge for the duration of the transit time of the FPS, about 1/200sec. Then you should be able to set the shutter speed to even the fastest speed 1/6000 and the FPS slit will scan the sensor during that time. A photo should be possible, even though there may be some issues at the top and bottom of the picture; due to timing and the flash running out of steam.
07-08-2015, 04:06 AM - 1 Like   #4
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Sadly that's the way it's always been with Pentax dslr's. The best guess is it's to protect us from ourselves, those black bars might cause widespread panic among unware users. Of course they could always make firing the flash above the sync speed a menu option that's disabled by default and the rioting would be avoided.

07-08-2015, 05:04 AM   #5
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Changing ev to half-steps will get you 1/180s, FWIW.

It is odd that we"re allowed to get focus and exposure wrong manually, but not flash sync.

ND filters will get you the higher speeds you need if DoF means you don't want to stop down.
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