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Assuming the tank gas can be considered ideal: P = nRT/V That is, tank pressure is directly proportional to temperature. So if your tank is 3000 psi at 30 C (303 Kelvin) sitting in the sun and it drops to 10 C (283 Kelvin) in the water we'd expect the pressure to drop to: 3000 psi *...

I've seen just such a photo taken with a dissecting microscope. The photo, and the rest of what little I know about scallop eyes, came from a book "Animal Eyes." It details the incredible diversity of optical mechanisms in the animal kingdom. As for the scallop retina, I should imagine...

Bingo!

Actually, if you could look into that eye with a little underwater opthalmoscope, do you know what you'd see?... Ohhhhh...Busted!

Ah, man. I was kind of proud of my answer. It may be the novice in me showing through... :D Here's a little tidbit about scallop eyes: although they look (a bit freakishly) a lot like our own eyes, they're biologically quite distinct. Scallop eyes actually use a concave reflector to...

Eyes of a scallop? Perchance...

I've also heard of people using KY Jelly and other, shall we say, "latex compatible" lubricants. Seems like that might be a little less messy than talc. Does anyone have any experience?

That's great. I've been wanting to check out the Zeagle line in person for a while now. I'll stop by tomorrow.. .

Hey Paul, Is PG Dive an authorized Zeagle dealer? The store isn't listed on the Zeagle website... -Todd

Well, if it worked for the Aeris Atmos 2 (also made by Pelagic) then I'd buy it in a heartbeat. -Todd

I'm just starting with the sport, and bumping into it's incompatibilities with the student lifestyle. Gear (at least the gear I want) is a bit pricey for my budget, plus I don't have a car and the dive clubs and dive shops around me all seem to meet outside of the city for their organized...

My girlfriend and I snorkeled there one of the days. It's a beautiful beach (our favorite of the ones we saw in the area) so I would recommend going even if you decide not to snorkel. Playa Conchal means "Shell Beach," so named because its Northern portion is covered with shells instead of...

I'm not a surfer myself, but my brother is and he's dying to get down there so I had my eyes peeled. Sounds like you're going to want to be in the same general area that SFScuba and I were in. Flamingo (where we dove) and Tamarindo are both near the Catalina Islands. And Tamarindo beach...

Hey SFScuba, I think we were on the same dive boat one of the days. Hope you enjoyed the rest of your trip. I learned a lot from this site as I was planning my trip, so I'll throw my comments in too. I dove for five days in May-June. I agree on all the basics: ~40 foot visibility (though...