Every half stop is critical when you're mixing flash and daylight.
I've shot outdoor wedding ceremonies that were under a gazebo with a
lit background. I need the higher shutter speed both to open the stop
a bit and keep the shutter speed high enough for can't miss
handholding. A faster flash synch speed is something that should be
available at this price point. DOF is just one small part of the
equation.
Paul
On May 22, 2009, at 12:04 AM, Matthew Miller wrote:
On Thu, May 21, 2009 at 11:09:00PM -0400, Paul Stenquist wrote:
You're missing the fact that the amount of flash exposure you can
work
into a shot is dependent only on the f stop. So if I shoot a backlit
portrait outdoors at f5.6, 1.250th, I can fill flash in at that 5.6
value.
If I'm forced to stop down to f6.7 because I can't go beyond
1/180th in
shutter speed, I lose flash exposure and increase DOF.
But again, *half* a stop. Assuming the FA 77mm at 10 feet, the depth
of
field is going from about 13" to 15". (Right? Up past my bedtime, so
feel
free to check my math.) Two (and a half, actually -- rounding)
inches isn't
nothing, but it's still only two inches.
Ideally, I'd like to have flash synch up to 1/1000th, but that's
complex
and cost;y.
Right, I understand that going from 0.0056s to 0.0010s would be
useful.
That's two and a half stops better, and in the example above, you're
shooting at f/2.8 and have more than halved your DOF, down to about
6".
And high-speed synch doesn't help much, because the flash power is
greatly
diminished by multiple firings.
So, improved noise performance should help just as well, right? I
wouldn't
be surprised at all if the sensor refinements gain you your half
stop back
right there. Optimistically, more.
--
Matthew Miller mat...@mattdm.org <http://mattdm.org/
>
The Definitive Pentax P-TTL Flash Model Guide: <http://pttl.mattdm.org/
>
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