update 2013 May
update version
1. stronger arm that can handle heavy flash like 430EX , sb600 etc …
it is always good to bring flash closer to the object which help to freeze the object even wind or hand shake (for more info please google “Inverse-square law for Light”)
quick explanation : (we have some sample from http://www.rodandcone.com/2008/05/flash-durations-for-canon-580ex-ii-and.html)
1/128 power = 1/36313 seconds Flash Duration —- SCALED to REPORTED DATA
1/64 power = 1/25341 seconds
1/32 power = 1/19232 seconds
1/16 power = 1/12914 seconds
1/8 power = 1/9151 seconds
1/4 power = 1/6107 seconds
1/2 power = 1/4019 seconds
Full power = 1/833 seconds
Canon 580 EXii – Distance from Flash to Sensor: 2 feet
1/128 power = 1/52718 seconds Flash Duration —- SCALED to REPORTED DATA
1/64 power = 1/38845 seconds
1/32 power = 1/26887 seconds
1/16 power = 1/18626 seconds
1/8 power = 1/13039 seconds
1/4 power = 1/8447 seconds
1/2 power = 1/5006 seconds
Full power = 1/871 seconds
simple compare, the lower the power mean we have faster virtual shutter speed which help to freeze the moment (due to wind, hand shake and etc) … so if when we do handheld macrophotography, it is always good to make flash closer to the object …
so some of my testing are base using the flash bracket (which bring the light source closer to the object)
e.g.
with Wimberley bracket with samples pictures
http://liewwk-macro.blogspot.com/2010/07/how-i-shoot-macro-new-accessories-and.html
cheaper version of twin arm bracket
http://liewwk-macro.blogspot.com/2010/08/how-i-shoot-macro-cheaper-version-of.html
some sample use this with SB400 flash from Michael Ee
this bracket is in-stock now …
RM180/each (with advice how to design the diffuser with yours’ current setup – lenses, flash…..)
contact me if you would like to own one or look for advice …..