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I must admit I was surprised by the results . I knew the optic trigger was obviously triggered at the speed of light but never knew how long it took for the flash to respond to that trigger . I used some 'special camera gear' , the D50 with its electronic shutter , two SB24's and an optic trigger .

I took a walk on the farm to find some 'different' scenery .



Set up the SB24 on this old shed ....



And the flash wouldn't trigger at more than 30cm away - the ambient was messing with the optic trigger so I went indoors and shot out the door so I could still have some ambient to play with .



I opened the aperture and increased shutter speed to darken the background and give me 1/4000th sec .



After playing around a bit because 1/16th power was too much at F2.8 I eventually bounced the flash off a wooden door to weaken it a bit .



Then I headed home because I could see the cows had the same idea .



The sun was coming out and I wanted to make the optic trigger work outdoors and so I put a tube around it - it still wouldn't work properly until I realized the foil was reflecting too much ambient into the tube so I pushed a black tube into it and this got me 4 metres working distance in sunlight .





I went for 1/4000th again



and eventually struck a happy medium with F7.1 , 1/4000thsec and 1/4 power flash ...



Not 'perfect' results but now I know what my limits are['nt] with off camera flash and the D50 !



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oh great experiment! thanks for sharing the info

(11-29-2009 02:15 PM)wrong Wrote: [ -> ]oh great experiment! thanks for sharing the info

It couldn't be done with any other system - only a D40, D50 or D70

Thanks for posting your experiment results. Nice idea of using the black tube to block the ambient light to the trigger sensor.
vw

(11-29-2009 03:20 PM)velvia_world Wrote: [ -> ]Thanks for posting your experiment results. Nice idea of using the black tube to block the ambient light to the trigger sensor.
vw

Possibly with a longer tube and the right materials I could get more distance but 4m was ok

Thanks for another nice set of flash experiement.

Unfortunately with the current trend of high ISO and CMOS sensor , it's unlikely we'll see electronic shutter comes back to our SLRs anytime soon..

(12-01-2009 07:30 AM)yellow15 Wrote: [ -> ]Thanks for another nice set of flash experiement.

Unfortunately with the current trend of high ISO and CMOS sensor , it's unlikely we'll see electronic shutter comes back to our SLRs anytime soon..

That's a pity because I enjoy the advantages of the electronic shutter