How do different coloured gels effect the GN output of flashes???

Question

if at all??

Answer 1

Hi Antoni, well depends of the gels or filters you use on the flashes and the type of your film.

If your film is Black and white, the gels will darken the real colors, which are the same than the gel. E.G. a green gel will leave a greater amount of green color pass. So al the greens will be enhanced and given more `presence. By using the complementary color, you will make clearer the color complementary to the gel. E.G. If you use a Blue gel, all the yellow colors will appear clearer.

If you are using color film then it depends what you want from the gel. You have gels and henc4e can choose to:

Correct Color: maybe you have a film for exteriors but it has snowed. Most probably is that your photos appear to be yellowish. By adding a bluish filter to compensate from the different color temperatures.
Convert Color: You have inside film but your flash only has outside - exterior options. The you would use an 80 a/b blue filter to convert the normal interior temperature (pro lights have a color temperature range from 2400 to 3400 ºK to convert it to 5600 - 6000º K normal exterior color temperature, if you had the opposite interior film and want to shoot outside the you would use an 85 a b filter to convert from 5600 - 6000 to 2400 - 3400. If you have interior normal non-professional lights then depending on the type of lights fluorescents appear green, bulbs appear yellow reddish etc and hence you would have to compensate and convert from 6000 to 1200 basic light bulbs, or from 3.400 to I.1200.
Highlight with color. You can use the gel to give a highlight to your subject e.g. outside film, outside flash setting you add a pink gel and your subject will appear to have pinkish highlights.
Soften Focus: You can use the gels to soften the light of the flash and to soften focus, increase-decrease depth of field etc.
FX_ From polarizers that block nasty reflections is glass material e.g. glass protecting a painting you can make sure that appears there is no "glass". You have certain cookies for gels that produce forms; you can even paint you own gels.

Of course, all these are more useful and significant if your main source of lighting is the flash. Then the changes can be very clear, if its not and the predominant light is that of the exterior, interior lighting it will serve just to correct or slightly highlight. You can avoid red eyes by making sure you use inside an inside color flash and inside film, and still add a blue gel to highlight your subject with more natural light. Etc

The world of color in photography and film is a fascinating one if you want to control the exact appearance of your picture but it is much more complex and rich that what I have just written above which was a basic hint of some possibilities.

Hope it helps
Santiago.

Answer 2

Different gel colors and types have different densities. Your best way to check the effect of the GN is to try them each with a flash meter and record the differences.

Answer 3

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Answer 4

I am sorry, I do not know.