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05-20-2013, 07:37 AM   #1
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Join Date: Mar 2013
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K20D slow speed sync flash

Hello, this is my first post on your very informative forum.

I have one question about slow speed sync flash on k20d. Could somebody please tell me why in this flash mode (slow speed sync), flash fires both at the begining and at the end of the exposure. Shouldnt he JUST fire at the end?
If no, what is the use of first flash.

Sorry for my eventualy spelling mistakes, english is not my native language.

05-20-2013, 08:14 AM   #2
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Location: Minnesota
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Modern TTL technology employs a pre-flash system to gauge proper exposure. You probably can sense this more easily in slow speed sync mode, but you'll get the double flash in all modes. This is normal. If you mount a flash that does not employ TTL you get a single flash. My preference on the K20D is to use an older flash with an auto-thyrister system for consistency and no worries about blinking.
05-20-2013, 09:45 AM   #3
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Original Poster
OK, if I understand you, the first flash fires before exposure and It only serves for proper metering.
Thank you for your quick reply.
05-20-2013, 08:19 PM   #4
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You have it exactly right.

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