There is this thing called ExpoDisc which sounds similar. On one of the
forums I'm on there is currently a lively discussion about its relative
merits:
http://www.photocamel.com/index.php/topic,2888.0.html
It's even dragged in ExpoDisc themselves to comment.
Apparently it's not too tricky to create one - can't find the reference
at the moment, but I think it just consisted of some semi-opaque
material across a filter or lens cap.
Paul
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
>
>
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