QUOTE(albnok @ Jul 12 2007, 01:10 PM)
Cool! A guide number of 50m is great for this price.
You can pull out the diffuser almost all the way out, so it sticks upwards but does not fold. I find that this works for giving a little fill. Also try it turned around 180 degrees, so the diffuser panel faces the subject. I actually prefer this to the Stofen Omnibounce and Lightsphere, and it sucks less battery too!
Unfortunately the EF-500 DG ST does not have wireless or HSS support. The Sony HVL-36AM has... but it doesn't have a built-in wide panel diffuser, swiveling head or strobe/manual power control.
HSS (High Speed Sync) means you can use the flash at a shutter speed faster than 1/160s, useful for fill flash in bright daylight. However, you can work around this by stopping down the aperture.
If the Sigma EF-500 DG Super is significantly cheaper than the Sony HVL-F56AM (RM1200 around Sg. Wang) it could be considered, though the Metz 54 MZ-4i does look far more interesting.
Actually the Sigma EF-500 DG ST supports HSS, it called FP however, my shutter can reach 1/4000 when attach the flash on it.
If you have more budget, definitely the 56AM is the best choice, but for poor man like, I choose Sigma over 36AM because:
(1) GN50
(2) Swivel and bounce head
(3) Build in 17mm wide panel, and when you pull out the panel, the flash will know and set the flash power accordingly.
(4) Manual full power or 1/16 low power.
(5) -7 degree bouce downwards for macro shoot
(6) HSS/FP
(7) Support TTL/ADI
(8) Can do burst mode with flash ( i had tried 2~3 burst with flash)
(9) Bright AF light can reach 9m.(not like build in flash, use the flash as AF, this is slower than the infared AF light)
The drawback is No wireless control. But then for this price, I think is acceptable.