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ML, I'm assuming you are using the strobes in their TTL mode. You may have to play with metering modes to figure out which works best, and you will likely find that certain modes work better in certain situations. Best way to learn is to get in the water and take note of your settings. Shoot...

Dave, What you are going to find is that the low-end compact market has all but disappeared thanks to the ubiquity of cellphone cameras. As a result any point and shoot that you can find a housing for is very likely to shoot in RAW and have a manual mode. We have reached a point in sensor...

The Nikon GN is in feet, the S&S GN is in meters. Website says Nikon strobe has GN 28/20 with diffuser. It also looks like it is built by Sea & Sea and labeled for Nikon, similar to what Sea & Sea does for the Olympus strobes. You can get a Sea & Sea YS-D1 for less.

I have to say that I think this is truly terrible advice. The majority of floods I have seen occurred in the first 3-5m of depth. As you go deeper the water pressure helps squeeze your o-rings in most housing. The worst thing I could think of, therefore, would be to have your $5000 or so bobbing...

If I were shooting 6D, I'd be using the 8-15 fisheye and one of the 100mm macro lenses. My first choice for a zoom would be the 16-35 II, but that won't fit, so I'd choose the 17-40, but I doubt I'd use it as much as the 8-15. I don't shoot all purpose lenses underwater because I don't think...

That housing, like almost all dive housings for SLR cameras, has a hole in the front for the lens. Meaning that just buying the housing is not enough to take your camera underwater. You have to buy ports. Some can be use for multiple lenses, some cannot. Here is the link to Ikelite's port chart...

The light you're interested in has a max beam angle of 37 degrees. I would never recommend any light for video with an angle below 60 degrees, and the higher the better. I have dual sola 1200s, i find their 60 degree beams to be too narrow, even when used together. I have yet to see a light at...

I was hoping this was about urchins . . . did the survey anyway.

I did have my carry-on weighed, I was traveling as part of a group. They made me take things out to lighten the bag, but ultimately let me on. I had ports and lenses filling up every pocket of my travel vest, which I was wearing just in case this happened. Everything went back in once I was past...

Partial Pressure is the fraction of a gas in a mix multiplied by the atmospheres the gas is being used at. Equations may or may not help, but here's one anyway: PP(gas)=Fraction(gas)*P(pressure in atm) Let's say we have a mixture of 20% oxygen and 80% Nitrogen (0.2 O2 and 0.8 N2). At sea level...

The Navy table is pretty much identical to every EAD table I've ever seen, with a working PPo2 of 1.4 and a max of 1.6. The dives I happened to be talking about were using mixes between 28 and 34, with maximum depths between 100 and 130. May max ppo2 was 1.47 for any of those, and that was for...

I used to work at SC, and if you're going before Thanksgiving, it is unlikely to be very busy. Busy seasons are Thanksgiving through New Years, mid-March to mid-April, and all summer. I know some people don't like the bigger boats, and it can be risky in terms of diver quality and quantity. That...

Ok, are you saying that all other things being equal, including cost, you would dive to 50m on air instead of TMX? Second, from IANTD: [/FONT][/COLOR] Third, TDI has the helitrox course which seems to be similar to the IANTD Normoxic TMX course. Both of these agencies seem to find value in...

Speaking to many divers over the years, I think there are quite a few who would say that the Navy tables are already "beyond safe" for recreational dives. For the type of scenario you are talking about, I believe the Navy procedure would be to surface and get in a chamber. Someone please correct...

Kindly explain to me what agency recommends 50m dives on gasses that don't contain helium. Also, what agency recommends staged decompression with back gas? I said best practices, not that it was impossible to do the dive on air.

If they need visual inspections, you will have to take it to a shop to be checked out, assuming you plan on getting fills somewhere other than your own compressor. If your cylinders need hydros, those have to go to a hydro facility. I'm assuming you're in the states, but if not, other rules may...

I have found my limit to be about 4 hours of diving in one day. I'm generally too tired to do more than that. Four one hour dives is easy to do with Nitrox 32, and you are unlikely to come anywhere near your CNS limits. I was looking at my log, and the only dives where CNS limits were a...

You are kind of making my point. I would never count on a suunto for efficient decompression for a 50m/40min dive, if for no other reason than best practices dictate trimix and a separate decompression gas. You would have to plan that dive, and it does not sound like you currently have the tools...

I'm a little confused about your stated scenario. I was just looking at my D6 manual to see what it says, and you only get locked out for being shallower than the ceiling for 3mins or more. If you are below, deco will either increase or decrease depending on depth. Second, concerns a potential...

The actual skills will depend on which dives you and/or your instructor choose to do. Some of the full specialty classes have more skills or give more depth to the skills, but it will ultimately depend on what you do. AOW is really designed to allow you to experience more types of diving: diving...