[Leica] Re: Adding warming gel to SF-20 flash?

["Eric" <ericm@pobox.com>]

Frank:

>If the light source does not have the wavelength present ( or the amount of
>energy in that wavelength is small) it will be impossible to filter the
>light in the way you might want.
>
>This is the reason that flash tubes are generally cold light sources and why
>filtering the flash tube has limited success.

Is this from experience or from theory?  I'd be interested in hearing of
poor experiences trying to filter flashes.  In practice, I've found the when
I put a colored filter in front of my flash, that's the color light I get.
For example, I've never put a warming filter in front of the flash head and
have green light result.  :)

If you match your flash to the approximate color temp of the ambient light
by using an ordinary colored gel in front of the flash, it's hard to tell
what's artificial and what's real.  Everything becomes real.