Carmen Miranda Offline Upload & Sell: On
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p.1 #4 · Elinchrom Dish: Deflector Orientation | |
Mark,
There is no reason you can't use the deflectors either way, but IMO they were intended to be used concave side in, as evidenced by the square indentation on the deflector that keeps the disc from rotating. Using them concave out will only widen the BD's peripheral hot spot and could potentially increase light control issues.
As shown by many others use of flat discs, the deflectors primarily function is attenuation. Dispersion is secondary, with most of the light coming directly off the reflector from the source. One interesting thing I've found about this secondary dispersion is the relatively subtle effect it produces, which is particularly evident with the gold deflector when compared to a soft box with a gel or gold interior or even when bouncing off a gold reflector. The minimal effect can even be seen between the silver and translucent deflectors, where there seems to be little difference other than the elimination of the "donut hole" in the catch lights. Although my BD's are all brushed silver and I use gold pretty sparingly, I've found in testing that the gold deflector is even more subtle and pleasing off the white surface for portraits.
The lack of grids is definitely a bummer (especially since the retaining lip already exists), but fortunately having a few 17" squares helps me get over it. 
Good luck.
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