Manual white bal with light and red filter

Hello

i somebody have tried this set up

manual white balance with light and filter

if yes what is your impresion

easy, good result , why for using this setting??

thank you

If your primary light source is the artificial light, then you'd want to do a MWB under that light without the red filter on the lens. The filter at that point is just making your life difficult, as the artificial light contains as much red at depth as it would on the surface.

If you are shooting in a mixed-light situation where natural light and artificial light are both contributing to the shot (and you're deeper than, say, 20 ft.), then you may want to use the red filter and do a MWB under natural light. However, you may find that the artificial light creates somewhat of a red "spot" in the center of the shot, especially for closer objects that get their primary light from the artificial source. In a situation like that, I try to use a BLUE filter on the artificial light to remove some red (which then gets added back by the filter on the lens).

Now an interesting question is, what will result from manually white-balancing using the artifical light with the red filter on and then shooting wide with mixed lighting as described above? I honestly don't know. You may find that the natural light in the shot comes out as blue as shooting without the filter at all, given your shift in white balance toward the extreme red end (filter + artificial light). So then you're properly balanced in the center (and closeups) but too blue in the wider/distant parts of the shot.

Hope that helps!

bk

Kotheimer,

With my FX7/Amphibico Endeavor setup I only have space for a flip filter. For a mixed macro and wide dive I have swapped the Flip Filter for a dioptre and fitted a "Magic" red filter to the front of the camera with a filter ring. Much to my surprise I found that the camera will AUTO white balance with macro shots through the red filter using my LED lights.

So I MWB balance during the descent, and when I use the lights I switch to AWB and have the option of the dioptre. I can then switch back to the original MWB setting for the wide shots.

I stress this only works for close-up shots which are fully lit with the lights.

Roger