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Thanks Chris, Ron, Birdie, Ken, Wes, Morris, Scott and Mr Pirate.
The boat was 100 feet long and moving at 10-15 mph. The motion I had to deal with was the orcas themselves. When they're traveling- as this pod was- they often come up to breathe several at a time, so group shots like this are possible. And the long lens compressed them.
The relative positions of the individuals are mostly a matter of guessing (at least they are for me).
But even when I wasn't shooting, watching these magnificent animals is totally thrilling.
Normally my slides look better than the scans. Not here, though. The dark skin was in shadow and there was backlight. Luckily, although my processing skills are still pretty basic, the work I did improved the image.