A Lockheed Electra L-188 air tanker, #489, dropping in slow motion on a wildfire. The date, location, and videographer (other than the logo at bottom-right) are unknown.
The wake turbulence as the aircraft passes through the smoke at 2:45 is very interesting, as is the precision drop at 1:45, keeping the retardant off the rocks in an area that is highly visible to recreationists on the nearby lake.
In August of 2012 Wildfire Today ran a photo of Tanker 489 dropping on the Taylor Bridge Fire.
Thanks go out to Chris