On Sat, 2 Oct 2004 11:23:24 +0100, "Len"
wrote:


"Mark M" wrote in message
news:nIq7d.12629$Hz.9309@fed1read04...

"Annika1980" wrote in message
...
From: "Mark M"

http://www.pbase.com/bret/image/34504445

Why are you shooting at 4f?
Isn't this shot with your 70-200 2.8 L?

1/250 could have been a crispy 1/350 or more at 2.8,
and yes...you'd still have some obvious and nice motion effects...

Can you say "flash sync?"

Ah.
There's no sky visible...

At least you thought to use 2nd curtain synch...



Hi,

saw the reference to 2nd. curtain synch. Could you please explain the
difference from 1st curtain?
I keep on seeing these terms mentioned but have never found an explanation
for them.

Regards

Len

It means the flash goes off just before the shutter closes, 1st
curtian means the flash is fired just after the shutter opens.

The problem with first curtian is that when there are moving objects
any motion blur is after the initial flash... so if you where shooting
say someone running from left to right they would be frozen by the
flash at the left side then you would see the blur/ghost image of
thier movement to the right... The movement trails/blur should be
behind the frozen person, so it ends up looking wrong.

If you cant picture the above visually, think of a comic book picture
of someone running (say road runner, beep beep, lol) where tbey put
the speed trails behind the person, with first curtain sync they would
have to draw the character with the speed trails in front of the
runner.


--
Jonathan Wilson.
www.somethingerotic.com