Keith's other slide (below), looking up at the stern of the dive boat while it was moored at Gordon Reef in the Straits of Tiran, also has potential. Indeed, shots like this, looking up at people gazing into the water from dive boats, were greatly in vogue at one time.
Equipment to enable divers to talk to one another has been available for some time on the commercial market and it works well. I've seen it used to great effect when posing other divers and it could even be useful on general photographic dives if an extremely compact version could be found. Keith used Fujichrome Sensia for both slides.
It is an ISO 100 emulsion and it has now been replaced by a new version, Sensia II, which has had good reviews. ISO 100 slide films - Sensia and Kodak Elite seem to be the most popular - are a good, all-round choice if you're using a Motor Marine, Nikonos or housed camera and flash. Fujichrome Velvia, which has a speed of ISO 50, is the general choice for close-up photography because of its vibrant colours.
For prints, I still opt for ISO 200 or 400 film from Fuji or Kodak - the quality is more than adequate for 'happy snaps', so why not have the speed? However, whichever film or films you choose to work with, it's important that you stick with them and don't chop and change. The ideal is to to know a film so well that you can visualise what the picture will look like before you press the shutter release. You might think this is an impossible dream, but the more pictures you take, the more familiar you will become with your equipment and the film you are using.
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