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At that depth for a wreck you will need a fisheye lens and a tripod to have slow shutter speeds
A normal 100 degre wide angle won't do the job at best you can shoot a diver with it
WA110/DCL30 works pretty well...not as much vignetting at the wide end as I thought there'd be. Took some nice shots of nudis since it was murky and WA probably wasn't gonna happen with my limited ability. Will post pics later.