Im a little bit bored today so thought I would do a little experiment with a couple of different cheap and easysoftening techniques/tools and take note the differences/effect on .
I set the car up on my computer desk and took three exposures, one with a bare flash, one with a stofen type speedlight diffuser, and one with a small translucent umbrella.
Base was manual mode, ISO100, 1/125th, and I metered the with a Sekonic . The flash was at full power, zoomed to 50mm, and the distance flash > subject was the same for all three shots.
My umbrella is supposedly a one- shoot through ... but Ive long thought that it sucked out a little more than that, and it seems im right. (Never got around to testing it properly before now)
1. bare flash , f16 (the read f11.9 so close enough)
2. flash with stofen on the flashhead , f11 ( was bang on f11.0 Seems this reduces by a full .. I wouldnt have thought so)
3. flash with "one- " shoot through brolly ... mmmmm. f5.6.6 (which in 1/3rd gets you to a shoot ap of f7.1) Thats a whole 2 1/3 difference in from the bare flash at f16 !!
I took these with my 85 1.4 at close to MFD, so the and overall has suffered in the last one with the brolly. Something to be wary of with longer and smaller apertures, even with flash.
The point ?? Not much really, except to demonstrate the effect even the smallest diffusers can have on your exposures and output. It also shows how a cheap umbrella can give you a really nice feather . You can see that when comparing the shadows and the specular highlights.
.... and .....
I was bored