Flash Value Lock?


Sean282

Link Posted 03/01/2014 - 10:12
One of my kids is a blinker when using TTL flash. Is there flash value lock functionality that I can utilise or am I limited to manual flash only (no preflash) to get a shot of him with his eyes open.

(p.s. I'm using onboard and a Sigma 530DG super)
Last Edited by Sean282 on 03/01/2014 - 10:15

layingback

Link Posted 03/01/2014 - 17:31
If he truly can out-blink the flash, as my wife can, there's probably no sure fire solution. Latest theory is that these people are gifted with the ability to close their eyes much faster than you or I. Not clear whether it is muscle strength or response time or both or something else.

Don't think he'll grow out of it either.
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Sean282

Link Posted 04/01/2014 - 00:23
I hope its the preflash which sets him off (haven't tried manual). I suppose I should be impressed if he's too fast for it

gartmore

Link Posted 04/01/2014 - 11:46
I think you mean P-TTL, so just switch to manual. It isn't as difficult to use as some people might have you believe
Ken
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -

McGregNi

Link Posted 04/01/2014 - 12:02
If you're using a flashgun try bouncing it upwards and sideways - this will lengthen the time between the preflash & main flash and might affect the blinking a bit.

I was amazed recently using a new device with the camera pop-up flash - its a silver panel that attaches to the hotshoe with the flash head raised, angled upwards at about 40 deg it bounces the light upwards but allowing some catchlight forwards through some slats. Its very effective actually, but you need to work in full manual I find - anyway, it massively increased the time between pre-flash and main flash in certain dimmer lighting, nearly half a second for some shots!
My Guides to the Pentax Digital Camera Flash Lighting System : Download here from the PentaxForums Homepage Article .... link
Pentax K7 with BG-4 Grip / Samyang 14mm f2.8 ED AS IF UMC / DA18-55mm f3.5-5.6 AL WR / SMC A28mm f2.8 / D FA 28-105mm / SMC F35-70 f3.5-4.5 / SMC A50mm f1.7 / Tamron AF70-300mm f4-5.6 Di LD macro / SMC M75-150mm f4.0 / Tamron Adaptall (CT-135) 135mm f2.8 / Asahi Takumar-A 2X tele-converter / Pentax AF-540FGZ (I & II) Flashes / Cactus RF60/X Flashes & V6/V6II Transceiver
Last Edited by McGregNi on 04/01/2014 - 12:04

MattMatic

Link Posted 04/01/2014 - 12:56
Quote:
it massively increased the time between pre-flash and main flash in certain dimmer lighting, nearly half a second for some shots

Probably because you've completely discharged the flash and it needs to recycle

I did a wedding for some good friends of ours - she out blinked all pre-flash! I used "A" mode outdoors and "M" indoors

Matt
http://www.mattmatic.co.uk
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McGregNi

Link Posted 04/01/2014 - 13:34
No, thats wrong, it was definitely pre-flash - what I was experiencing occurred even when the camera had been off. I was using manual 'catch-in-focus', and as I turned the focus ring, when the centre red point illuminated there was a slight electrical sound and the pre-flash fired, but the viewfinder remained open, then the delay as I said before the flash fired and the shot was taken.

Not sure if this is correct behavior, but I am guessing it was caused by the unusual bouncing arrangement.
My Guides to the Pentax Digital Camera Flash Lighting System : Download here from the PentaxForums Homepage Article .... link
Pentax K7 with BG-4 Grip / Samyang 14mm f2.8 ED AS IF UMC / DA18-55mm f3.5-5.6 AL WR / SMC A28mm f2.8 / D FA 28-105mm / SMC F35-70 f3.5-4.5 / SMC A50mm f1.7 / Tamron AF70-300mm f4-5.6 Di LD macro / SMC M75-150mm f4.0 / Tamron Adaptall (CT-135) 135mm f2.8 / Asahi Takumar-A 2X tele-converter / Pentax AF-540FGZ (I & II) Flashes / Cactus RF60/X Flashes & V6/V6II Transceiver
Last Edited by McGregNi on 04/01/2014 - 13:36
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