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Aquashot

Member Since 30 Nov 2009
Offline Last Active Dec 28 2012 04:44 PM
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Posts I've Made

In Topic: Buoyancy, trim and streamlining

10 April 2010 - 06:44 PM

First of all, never never hold your breath. I know there are situations when you think or are sure that you can get away with it, but all it takes is one slip up and you can get hurt or even killed. You can suffer a fatal AEG (arterial gas embolism) after an uncontrolled ascent of just 3-7 feet by holding your breath to get a shot. Especially in shallow water, sudden surge caused by wave action can cause this. IF you get into a habit of holding your breath while shooting, sooner of later you will get so wrapped up in the shot that you will begin pushing the limits of good judgment. It just ain't worth the risk.

Instead, practice your buoyancy, experimenting with the amount and placement of ballast, without a camera, until you are able to hover in place comfortably while maintaining steady controlled breathing. The advice to check your weighting at the end of a dive during a safety stop with a about 500psi remaining in your tank is exactly what you need to do to fine tune how much ballast you need. You should have just enough to remain neutrally buoyant at 15 feet with very little air in your BCD.

Your buoyancy is radically different in full scuba than when snorkeling, so give yourself time to adapt before adding the challenge of photography.

When setting up how you are distributing your weights, be very careful about how much undroppable weight you use. Always have enough of your weight attached to you in a good easy to dump system in case of an emergency that requires you to achieve positive buoyancy to get to or remain on the surface. Your statement about adding lead flashing to your rig via a home made set up makes me nervous. Give yourself time practicing before you go and start modifying your gear. In addition to potential safety hazards, you will also be voiding your warranties!

In Topic: Wrasse ID

31 March 2010 - 10:27 AM

I'm convinced,

So far the juvenile saddle wrasse is the closest match. The way the mouth looks is probably just due to the angle of the shot.

Thanks

In Topic: Wrasse ID

30 March 2010 - 06:54 PM

I think its an oddly colored Saddled Wrasse (Thalassoma duperrey) in transitional phase. It is endemic to Hawaii.


I am thinking you are right, what is throwing me however is the total lack of a mid-body white or light stripe and the mouth shape does not look quite the same, at least in the resources I have, "Hawaiis Fishes by John P. Hoover, "Reef Fish Identification, Tropical pacific" by Allen, Steene, Humann & Deloach and this website: http://www.marinelif...com/default.htm by Keoki & Yuko Stedner

darn, I really want to know, the wrasses are tough to nail down sometimes.

In Topic: Editing- to much? to little?

30 March 2010 - 06:36 PM

Thanks Tjsnapper,

I needed to be about 10 feet to my left and 5 feet closer to the reef to really get the shot I saw in my mind as the turtle swam by, sometimes you just ain't in the right place at the right time. Given the position of the sun, the turtle, reef and me there really was no way to pull off exactly what I wanted from the shot, at least at my level of skill manipulating settings on the fly.

Hence the solution to use editing tools to make it what I saw in my minds eye.

I suppose the editing question really depends on what the intended use/audience of the image is. If you are going for National Geographic style documentary, then I suppose not much is acceptable.

Striving to get things right in the camera is the best way (and less time consuming) especially if your aim is to represent as much as possible what the eye sees. However, no camera really does this, all photographs are an image created by artifice. Even Ansel Adams used burn and dodge and other darkroom techniques to alter images.

I suppose this is really straying form the intent of the forum, but it seems to me that how editing is viewed depends on weather you are looking for a photo that is a literal image of the scene or if the photographer is using the camera/computer as a tool to make an artistic representation of the scene.

In Topic: Wrasse ID

30 March 2010 - 10:26 AM

Sorry, I forgot the all important location: Kona, Hawaii