White Balance

6 replies [Last post]
Alan Bubbles
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Joined: Feb 16 2003

I,ve started useing a new underwater housing which has a flip down pink filter for blue water use.Would I be better using auto white balance or manual and if manual when would it be the best time to point the camera at some white card?
When I,ve used it on auto, the camera appears to counter the effect of the filter.
Thanks,
Alan

SIFI
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Joined: Sep 16 2001

I'm not familiar in any way to the sort of filming that you are doing, but I would suggest the only place you can accurately set your white balance is in the environment you need it for.

I cannot think of any other way of setting outside the actual environment, so you will need some sort of waterproof card to use.

Simon

Simon

Alan Roberts at work
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Joined: May 6 1999

Shooting underwater is tricky. Water absorbs long-wave light so you get blue images. You need to decide whether you want your pictures to look "under-water blue" or not.

If "no", then you can do much worse than just leaving auto-white balance switched on. Most cameras do it continuously so you don't see jumps in balance, and the camera aims to keep the scene neutral.

If "yes", you need to manually white balance to the daylight above water and then just shoot. That may look too blue, so you may want to white balance to the pink card, under water at the depth you are going to shoot. The degree of pink will be subtracted from the scene leaving you with a degree of blue.

Only your experience will sort this one out.

Dee
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Joined: Nov 19 2002

The red filter used in most underwater housings should not affect the auto feature on the white balance. It should continue functioning correctly. The red filter does nothing more than compensate for the loss of the colour red (primarily) at depth.

which housing, and which camera are you using Alan, what depth are you at? and do you use any lighting?

Dee

c.j.video produ...
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Joined: Oct 9 2003

I have used the Sony PD150 with an ewa marine housing, it works very well up to about 5m in reasonably clear water

Alan Bubbles
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Joined: Feb 16 2003

My camera is a Sony TRV 950.
My housing is a Light and Motion Stingray II
I have two HDI lights which are balanced for daylight.
Dive depths are down to 50mts.
I use the filter when not using the lamps from any depth below say 5mts.
compaired to my old Hi 8 camera and housing which had a screw on filter, the blue on tape dosn't seem to be as deep.
Alan

Dee
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Joined: Nov 19 2002

Exactly as you are supposed to!

the HID lights although the expensive ones £1500+!) arent really that much use in my experience. I have both these and the Sunray-S which I find more useful in colour enhancement for closeups.

I bought the TRV950 a month or so back and the stingray housing is on my chrismas prezzie wish list, but for now the Light and Motion Mako PC100 is what I use which is inferior to the 3ccd set up, but works very well.

I am not sure how bad your shots are coming out, so I can not really pass comment without seeing your work - have you got any clips on a web site at all?

Where are your diving videos shot? this country or sunnier climes?

Dee

[This message has been edited by Dee (edited 10 October 2003).]