Alex. I have recently taken about 560 images underwater with the Nikkor 8-15 fisheye on the DX format D500, around 230 of which contained partial or full sunbursts or dappled light. Most were taken with a 210mm Nauticam acrylic dome but a few were with a Zen DP100 dome and a few again were taken in conjunction with a Kenko 1.4x TC. Focal lengths varied through the DX applicable zoom range and there are a mixture of horizontal and vertical format shots. None of the images show any hint of the flare seen in your and Adam’s shots. Many of the sunburst shots were taken fairly shallow – a few at 3m. or slightly shallower. Probably the relevant difference is that using DX, I didn’t need to remove the dome shade but I didn’t use the lens hood.
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