The Sto-Fen Omni-Bounce for 580EX/580EX II creates a bare light effect from an accessory Flash
such as the Canon 580EX Speedlite Flash.
Lighting coming directly from a small flash head is typically
harsh looking on your subject because of the sharp, strong shadows.
If you are in a small room with a white wall and/or ceiling or have another white reflective surface,
you might have an application for the Sto-Fen Omni-Bounce for 580EX/580EX II.
The Sto-Fen Omni-Bounce for 580EX/580EX II is very simple design -
a single piece of molded, translucent, slightly flexible plastic.
It mounts on the head of a flash using a friction fit (which I have found to be adequate).
There is no Velcro to mess with and installation/removal is very easy.
It would be hard to damage a Sto-Fen Omni-Bounce for 580EX/580EX II unintentionally.
The 580EX version has a slight domed top to accommodate the pull-out diffuser/catchlight reflector.
The bare bulb effect of the Sto-Fen Omni-Bounce for 580EX/580EX II causes light
to be scattered in almost all directions from the flash.
Some light will directly hit your subject and some light will be directed at your
subject from the reflective light sources nearby.
Shadows are reduced and softened - and the resulting is generally better.
The Sto-Fen Omni-Bounce for 580EX/580EX II will do very little without a reflective surface.
Many people put the Sto-Fen Omni-Bounce for 580EX/580EX II on their flash and leave it there.
However, without the reflective surface, you get a very similar light source
as you get with a bare flash head.
One slight advantage of leaving the Sto-Fen Omni-Bounce for 580EX/580EX II mounted is that
the light source will be slightly farther from the camera if used in the
recommended 45-60 degree flash bounce setting.
You will not notice the difference if you are not close to the subject.
The big disadvantage of using the Sto-Fen Omni-Bounce for 580EX/580EX II without a reflective surface
is that you cut the power of your flash significantly (by a factor of 2.5).
Your flash will work harder and you will drain your batteries faster.
When looking at comparison pictures taken with and without the Sto-Fen Omni-Bounce for 580EX/580EX II,
make sure you are comparing apples to apples.
Make sure the exposures are identical on both,
make sure the subjects are 100% identical.
The Sto-Fen Omni-Bounce for 580EX/580EX II has Macro flash applications as well.
Typically, an on-camera flash will not be able to aim down far enough to
light a Macro subject right in front of a macro lens such as the
Canon EF 100mm Macro USM Lens.
The Sto-Fen Omni-Bounce for 580EX/580EX II redirects enough light down toward the front of the lens
to light the close-up picture.
Some of my insect and flower shots were taken with this lighting method.
The Sto-Fen Omni-Bounce for the Canon 550EX Flash
will also work on the
Canon Speedlite 580EX Flash
It does not fit snugly, but will get the job done.