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I see I didn't really dispel the confusion here. PADI has two certifications whose names sound alike: Master Diver and Dive Master. Master Diver is not a professional certification. It requires Rescue Diver certification, five specialty courses, and 50 dives. The second is the first of their...

PADI Master Diver requires 50 dives, not 20.

Because We Really Aren't Fish

Lumens measure the total amount of light. The brighter the light, the higher the lumens. Lux measures the number of lumens per square meter. The farther the light source is from the target, the lower the lux, because the light spreads as it leaves the light source. The guide number relates...

If you're going to Cairns, why do you want to dive out of Sydney? <g> Don't forget, Australia is in the Southern hemisphere: going north gets you to warmer water. I did my open water course in Cairns. The dives were part of a three-day liveaboard: three-hour ride out to the reef, followed by...

Eureka!

Pretty standard stuff for athletes. Pick up any beginner's book about running and they'll tell you the same thing. One useful exercise: lie on your back with a small book on your stomach, and watch it rise and fall as you breathe.

It won't show up, but don't dismiss it. It's telling you that those areas of the picture were overexposed. Similarly, flashing black means underexposed.

That can also be caused by dirty lenses, a much more likely culprit. (I didn't see any mention of this, so forgive me if you've already eliminated it.)

It's more than that, though. With manual settings, you divide the (underwater) guide number by the distance to the subject to get the f-stop. Or you can go the other way, and divide the guide number by the f-stop to get the correct distance to the subject. For example, if the guide number is...

My open water class in Australia was on a liveaboard. There were three levels of checking: 1. Your buddy makes sure you get out of the water 2. Divemaster logs each buddy pair in and out of the water 3. Each person has a safety number. Before leaving the site, the skipper goes around with a...

It was Friedrich Schiller.

Since that faceless techie has knowledge and equipment that I don't have, I trust the techie.

Or it displays wrong information.

If you know that it died.

That sounds like all-or-nothing inflation. Make small adjustments. Just a short pop on the inflator knob, then wait. If that's not enough, do it again. Practice fin pivots. That's where you learn basic buoyancy control.

For what it's worth, I had heard a different explanation: The second rainbow comes from light that's reflected twice within a single droplet. About thirty years ago I saw a triple rainbow over Boston. Didn't think to take a picture.

There is more to it. That's why you should do the deep dive in AOW. The deeper you go, the thinner your safety margins become. And you really don't want to be exposed to nitrogen narcosis for the first time without someone else there who is watching for extreme reactions.

For what it's worth, my Nikon puts out raw files with a .NEF extension. Depends on the camera, but .RAF sounds like the name of a RAw File. Thanks to the inspiration of this thread, I finally started playing with PhotoShop Elements 3.0's raw converter. In the past I've just taken the default...

The only reasonable way to dive from Cairns is a liveaboard. It's three hours out to the reef, and three hours back. So day trips are pretty much out. I did my OW and AOW with Pro-Dive. Good outfit, focused for beginners. Somewhat tight quarters, but everyone was friendly, so it didn't...