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01-21-2013, 09:21 PM   #1
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Pentax K-m flash issue

Hi, the problem when I wanna shoot in less time then 1/125 (it means that I wanna shoot in 1/250, 1/1000...). The camera is not transmitting any signal to external flash. I've got this checked for 100% with my external transmitter and receiver. Until 1/125 camera sends signal to transmitter.
Please help.

01-21-2013, 09:43 PM   #2
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You pass the max sync speed, nothing to do about it. Why do you want to shoot with a higher shutter? Flashes most often freeze the subject anyway.
01-22-2013, 01:56 AM   #3
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You should be able to sync at 1/180, what wireless triggers are you using?
01-22-2013, 07:51 AM   #4
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QuoteOriginally posted by VisualDarkness Quote
You pass the max sync speed, nothing to do about it. Why do you want to shoot with a higher shutter? Flashes most often freeze the subject anyway.
Is this sync maximum on other pentax dslr cameras too ?
I wanna shoot outdoor portraits and i need to control ambient light with shutter speed.

01-22-2013, 07:54 AM   #5
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QuoteOriginally posted by elliott Quote
You should be able to sync at 1/180, what wireless triggers are you using?
Nope, it is at 1/125. I dont know why u ask about trigger if problem is in camera. I tried flashlight too, not working. This is the trigger : PT 16 16 Channels Wireless Flash Trigger for YONGNUO YN 460II YN 468 YN 560 | eBay
01-22-2013, 08:12 AM   #6
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I asked about the trigger because the Yongnuo RF-602 has a problem syncing beyond 1/125 on a Pentax body without a modification, those are the triggers I use so it sounded familiar. I don't think those older ones had the same problem though.

I can't think of any reason why you wouldn't be getting full 1/180 sync with a flash on the camera, unless the camera is broken anything up to 1/180 should definitely work.
01-22-2013, 08:16 AM   #7
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There are a couple of things that may limit the flash sync. First, what are the exposure steps selected, depending on 1/2 or 1/3 stop can change the maximum sync speed reached because the maximum speed may not be a direct increment

Also make sure there is nothing like rear curtain sync selected, this restricts sync to 1/2 leading curtain sync.
01-23-2013, 08:24 AM   #8
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QuoteOriginally posted by Lowell Goudge Quote
There are a couple of things that may limit the flash sync. First, what are the exposure steps selected, depending on 1/2 or 1/3 stop can change the maximum sync speed reached because the maximum speed may not be a direct increment

Also make sure there is nothing like rear curtain sync selected, this restricts sync to 1/2 leading curtain sync.
I will check exposure steps. What is rear curtain sync ?

01-23-2013, 09:36 AM   #9
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QuoteOriginally posted by mmand Quote
I will check exposure steps. What is rear curtain sync ?
It makes the flash go off at the end of the exposure rather than at the start.
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