regarding off camera.. yes its still worth a try. if u can have some help for holding the cam.
some thing like this
http://www.swpp.co.uk/professional_imag ... ts/ad8.jpg will be helpful i think
regarding rear-sync. (i hope u want to do something like this :
http://cubox.info/uploads/posts/2007-10 ... _05_12.jpg)
some points
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1) Rear sync, or rear curtain, fires the flash at the end of the exposure, making it ideal for use with moving subjects. right?
2) what ever be the shutter speed the flash fires for a fixed amount of time. say 1/10000 or so of a sec.
with this in mind. consider some situation like this.
see this for example
gallery/image_page.php?album_id=1&image_id=1371(bad example though may be)
its taken at around 6.30 PM, F2.8, 1 sec or so.
if i had a flash in my hand, i have two options. front-sync (Corrrect word ??) and rear-sync. (with the same exposure settings as above)
it i had used front sync then the bat image would have became clear @ the left of the image and a trail comeing to the right : clearly not an ideal feel.
in that case i use rear sync... the pic will be recorded in the sensor as in the above pic and just before the shutter is going to close, the flash fires. so u get a clear image of the bat @ end of the trail giving a sense of movement.
consider a situation if we dont have any ambient light. there is no light around so that the camera can record a trail or so. but since the flash output is quite powerful... u get a clear image of the subject with dark background with the placement of the subject in the frame depending on when the flash fires.
btw. i havnt tried all these things yet.. all are things that i assume. could be wrong or right. dont have any shot of mine to show as proof.
regards,
Anoop