|
The
following assumes that we are using speedlights in MANUAL MODE.
Key:
When shooting with flash, we have to account for TWO separate
exposures:
1.
One for the natural light (at times, underexposed to create
shadows)
2.
One for the flash exposure (used to fill the shadows)
F/Stop controls the flash exposure
Shutter speed controls the ambient light
What
can I do with just ONE simple strobe?
Use
it in conjunction with natural light, as the main/side/backlight
to
give you nearly studio lighting and now light a subject with
"two" lights.
COLORING
LIGHT
Gels
are used to both color/warm light, & balance color
temperature of
existing
"bulb" light. (incandescent/fluorescent)
SOFTENING
& HARDENING LIGHT
Closer
to the bounce/umbrella, the softer the light.
Using
a "snoot" to focus the beam hardens the light.
FOCUSING
LIGHT
A
tube or "snoot" over the strobe can focus the light
beam,
or
create a spotlight effect. (also used as hair lights)
MOTION
ANALYSIS
Manual
flash power, when turned down, uses very short flash durations,
(10-25,000 sec.)
this
is the equivalent of a using an extremely high shutter speed.
Use it to freeze motion
and
illuminate at the same time, unlike just a high shutter.
Experiment
with it to reveal what you can't normally see.
Practice
CREATING LIGHT:
You
can now carry all the light you need in your pocket
to
both fill existing light or be the all light in your shot.
When
using multiple strobes. Shoot off one at a time to
see
the effect & determine proper exposure for each. Then turn
on all for the final shot.
Use
snoots/backlights/fill lights to "shape" flat objects.
Remember
the cabbage shot? That's how it was created.
REMOTE
TRIGGERS
Enable
you to hide and/or set lights off from 200ft +.
Stash
in night shots. Long time exposures can now also
render
defined clarity with a subject in them.
Transmitter
required on hot shoe. Receiver required on flash.
see
below:
Paul
C. Buff remote triggers
(my
recommendation for performance/value. Call if you have questions
before buying)
http://www.alienbees.com/cybersync.html
CyberSync™
Trigger Transmitter (CST) $59.95 (mounts on hot shoe)
CyberSync™
Battery Powered Trigger Receiver (CSRB) $69.95 (connects to each
flash unit*)
* see
link above to verify flash connection/hot shoe required for your
flash.
GET
STARTED EQUIPMENT:
See links below.
Please
NOTE: I chose the equipment below for maximum
portability/backpacking.
if
this is not your need, you might want larger umbrellas, etc.
Your
Speedlight
Light
stand & clamp
Umbrella
Gels
Manfrotto
Umbrella Bracket/Swivel 026
http://www.mpex.com/browse.cfm/4,430.html
Flash
Gels
To
correct color & add effects
http://www.photogels.com/
Compact
Umbrella
Westcott
43" Collapsible Umbrella with Removable Cover
15" FOLDED
http://www.mpex.com/browse.cfm/4,4635.html
Compadt
Light Stand
http://www.mpex.com/browse.cfm/4,4944.html
Manfrotto
5001b Nano Light Stand (3373/001b)
BALANCING
FLASH with Ambient Light: DAYLIGHT
Indoors:
interiors to about 1/60th at f/4 at ASA 400
keep
the aperture at f/4 and go to a 250th of a sec., or go to 125th
at f/5.6. Whatever.
The
idea is to build an ambient-light-only exposure that would
result in an underexposure of 2 stops.
That
will be your lighting ratio. You can choose another ratio (and
you should experiment) but 2 stops is a good starting point.
Move
your lights accordingly.
Outdoors:
Step
one: Think of the sun as your main light, and your strobe as
a secondary light.
set
your camera at the highest shutter synch speed (i.e. lowest
aperture)
to
ease the burden on your flash. Now, get your base (ambient)
exposure.
Call
it a 250th at f/11 at ASA 200.
Now,
with your strobe on manual and on a stand, set it to
somewhere around
a
quarter to half power if you are working close.
If
you are not lighting a large area (and you usually are not) zoom
the flash to a 70mm
or
85mm lens angle to make it even more powerful.
Pop a
test frame and eyeball it.
If your flash-lit area is too bright, dial the flash down
or move it back.
If it is too dark, dial it up or move it forward.
For
Nikon users ONLY:
Nikon CLS:
wireless
capability ALREADY built into your camera with Nikon strobes.
Nikon
has their own completely wireless capability with most cameras
after the D 70,
and
their flash units.
http://www.kenrockwell.com/nikon/ittlslave.htm
I
would be happy to show anyone who needs a demo.
How
Light Changes with Distance/Moving Flash/Altering Flash Power
Illumination
Falloff:
The
Inverse Square Law
It's
useful to know a little about the inverse square law especially
when using flash or studio lights. Basically all the inverse
square law says is that an object that is twice the distance
from a point source of light will receive a quarter of the
illumination. So what it means to us photographers is that if
you move your subject from 3 meters away to six meters away, you
will need four times the amount of light for the same exposure.
This can most easily be achieved by opening the lens aperture
two f-stops or using a flashgun that is four times as powerful.
CHALLENGE:
Try to use flash in conjunction with natural light in your next
great shot!
I
would be happy to answer anyone's questions orhelp them out as
necessary.
Dennis
Ruga
djruga@ix.netcom.com
http://ruga.zenfolio.com
660-9168
|