Hi.
I was advised there are on-flash filters available (presumably gel-type) to match the ambient temp. (for instance shooting portraiture at late afternoon or sunset with on-camera flash for fill-in).
I checked B&H online catalog - couldn't figure such available for Canon 550EX and Sunpak 383 Super.
Any hints what they can be and where to find (for oneline ordering) ?

Regards, Alex