Friday, 19 October 2007

Wide angle settings 15mm Fisheye - Cottage Reef

Strong N wind and early high slack meant Cottage was the site for today's dive. Cottage must be dived when the tide is ebbing. The flood tide creates dangerously strong current here.

The water was flat enough but vis was bad due to continuing strong winds which stir up the bay. However it was a beautiful warm sunny day so there was no stopping Trevor and I.

With wide angle you can open up the aperture to about f/8 - f/16 and still have heaps of depth of field. Camera shake is less of a problem so slower shutter speeds like 1/30th - 1/90th can be used.

All of this means lighter sunlit backgrounds and water can be captured. You have more scope to balance the background exposure with the flash lit subject in the foreground.

Ideally you need good vis for wide angle so today was a struggle.
Strobes need to be placed further out from the lens to avoid backscatter. Not many keepers from this dive.

Issue of the day was .... loading the camera into the housing with the shutter release lever rotated 180 deg. This meant the shutter could not be operated. Had to pull the camera out and rotate the lever into the correct position. Lucky I tested it before leaving home.

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