08-31-2014 02:42 PM
09-01-2014 01:30 PM - edited 09-01-2014 01:34 PM
Cloudy white balance will add a tiny amount of "warmth" to the shot -- but this assumes you are shooting JPEG (white balance is never applied to the image if shooting RAW). When I shoot in cloudy weather I very gently nudge up the WB by about 3-5%.
This short for example: https://www.flickr.com/photos/thevirtualtim/8981989420/
Was actually taken mid-day on an overcast day and just the 5% boost to white balance warms it up (and has the side-effect of saturating the grass... I did not actually touch the saturation slider in this shot -- that's "as is" but the grass looks saturated simply because of the very gentle white balance adjustment.)
I don't think you'll necessarily need to gel the flash. According to Bryan Peterson, you can capture the "rainy" effect (he prefers to do this on a sunny day using a garden hose sprayer / sprinkler) but the subject needs to be backlit (he wants the water droplets backlit) and that helps to punch them up in the photo. He shoots facing the sun (with sun out of frame) to light up the water. Also, he uses a 1/60th sec. shutter speed to get the water drops to have appropriate length streaks to imply the motion in the water.
If you have a few flashes and wanted to blue-up the water, I might try to gel the backlights with CTB (color temperature blue) on the backlights, then add front lighting source using CTO (color temperature orange) to warm the subject. The CTB is fairly weak (its intended to correct a tungsten bulb to daylight balance) and you could even use Quarter CTB for a weaker blue effect (and Quarter CTO for a weaker warming effect.)
09-02-2014 10:58 AM
I would first expose for the background and set your WB where you like it. For overcast I'm usually in the 6 -7k range, as I too don't like the fake blue look. Just a little warmth. Then add in your flash. If you're already up that high then chances are that ungelled flash will be warm enough. I often use a quarter straw gel when I want to warm up the subject just a bit off the background, but I certainly wouldn't go full CTO unless you want something unrealistic. If it's partly cloudy it can look like the sun is peaking out and lighting the subject, but on a completely overcast day it just looks unrealistic, IMHO.
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