swisspace wrote:
>I was pondering the emails of a few days ago about white balance and
>then remembered my panasonic camcorder has a whitish opaque lens cap
>just for this purpose, I then wondered why the dslr camera manufacturers
>don't do one, i.e you just set the white balance whilst the lens cap is
>on the camera.
>
>Just checked the patents and it is already patented, so no fortune for
>me, but why are the manufacturers or someone else not making them yet
>
>
http://www.expodisc.com/
Interesting development. This used to be Wallace Photo products and the
product was promoted primarily for accurate exposure determination; note
the 18% transmission factor. The old man died and things were in flux
last time I checked it out. Now the same basic product has morphed into
a white balance tool. Clever...
To make your own, find one of those caps off a defunct video camera. If
you are lucky, you may be able to find one that fits one of your filter
ring sizes directly. If not, just find an old or useless filter, take
out the glass, cut the white material to fit and mount it. Probably not
as good as an ExpoDisc, but much cheaper. The one from my old Sony fits
rather well on the 62mm filter rings of a couple of my lenses for the 300D.
Moose
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