Every Alteration Must Be Counteracted

If you want to change any of the exposure settings, you must counteract the change in order to retain correct exposure.

If you want increased depth of field you "STOP DOWN" the aperture but must compensate by slowing down the shutter speed to let more light in but this might result in subject blur.

Matrix metering

This form of metering, and derivations of it, works by splitting the frame into sections and takes each of these into account. This tends to be more accurate than centre weighted.

In the case of Nikon SLRs and Nikonos RS, matrix metering the frame is divided into 5 sections

and each section is taken into account. The meter then averages out all of the 5 separate readings to arrive at a correct exposure.

With this form of metering, bright areas will be taken into account and should not fool the system as much as with centre weighting.

Spot metering

As the name implies, the meter cell reads only the light from a very small part of the frame.

This is ideal for critical exposures of certain areas but is not really practical to use with automatic cameras as the readings could well be inaccurate for the rest of the frame.

This system is best used with the camera on manual.

Well, that should give you enough to ponder on and absorb. In the next issue, we'll look at close up photography and see how easy it is.

Peter Rowlands [email protected]

Ever wondered, half way through a liveaboard trip, whether your pictures are even coming out?

Well now there's a simple, exciting solution.

Digital cameras are turning underwater photography on its head. For as little as £450.00 you can buy a digital camera and housing. And that could be all you need to take great pictures.

That's because most of what you add on to conventional underwater cameras is built-in with digitals. Without any extra lenses you can zoom in tight on a small skittish fish or get within centimetres of a colourful nudibranch. Less to prepare, less to maintain and less to spend.

In fact less is definitely more. Digitals are usually less bulky than conventional underwater cameras and offer more user friendly features. Like the ability to replay all of your images right after the dive (even during it with some systems). It makes learning to use your camera much faster and gives you confidence that your pictures really are coming out. For more information call Ocean Optics.

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Tel 0207 930 8408 Fax 0207 839 6148 www.oceanoptics.co.uk

Ocean Optics 13 Northumberland Avenue, London WC2N 5AQ

Ever Wondered How Much Your Underwater Camera Retailer Really knows?

Ever considered that the closest your dealer ever came to product training was to read a brochure? It's a sad fact that many people selling underwater camera equipment don't understand it -or even take underwater pictures themselves.

Ocean Optics is different. With us, product knowledge and experience count.

Meet Andrew Bell.

Andrew's been taking underwater pictures for fifteen years. In his home waters of British Columbia he has produced his own four part television series for cable TV. And he's one of the very few cameramen in the World to have filmed the mysterious and elusive six gill shark. So when we were considering the revolutionary Quad Flash, it was Andrew who got to evaluate it. And where better than on an Ocean Optics sponsored workshop with the legendary Kurt Amsler? Because without Andrew's approval, the Quad wouldn't have made Ocean Optics' product line up.

And if you didn't see much of Andrew last April, it's because he was in Redang, Malaysia, trying out the Olympus digital cameras with the new Inon flashguns and lenses. With Ocean Optics paying his way.

Sid Thakers seen his work published in Dive

International, The Financial Times and The Independent. Sid's a prolific photographer and a founding member of Young Underwater

Digital Cameras For Beginners

Digital Cameras For Beginners

Although we usually tend to think of the digital camera as the best thing since sliced bread, there are both pros and cons with its use. Nothing is available on the market that does not have both a good and a bad side, but the key is to weigh the good against the bad in order to come up with the best of both worlds.

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