Re: Underwater Digital Camera recommendations

If you are going to use an external flash on a digital camera using it as a
slave unit, it must have three additional functions:

1. It must have a slave sensor that can trigger the flash from an external
flash. For reliable operation you may need a fibre-optic cable kit to
ensure that it will still trigger even when not pointed directly at the
cameras built-in flash unit.

2. It must be compatible with the pre-flash given out by many digital
cameras, otherwise it will 'flash' when the internal camera does it's
pre-flash, not when the main exposure flash is triggered.

3. You will need a variable flash power setting so you can manually set the
external flash to suit the distance between you and the subject, aperture
and ISO (ASA) setting. In addition this can also be useful when balancing
flash against ambient light, as when photographing a close-up whist not
losing detail in the background.

Many UW flashes have these functions. I use the Sea&Sea YS90TTLdx Duo, the
YS120dx also has these functions. Ikelite, Subtronic, Epoque and Inon also
of these functions on some of their models.

The Inon are getting very good reviews over here in the UK.

Dan Bracuk <NOTbracuk@pathcom.com> wrote:

> I read somewhere that everytime you save a jpg file, it compresses a
> bit and gets a bit worse. When editing my photos, I will save the
> file up to a dozen times as I go along.
>
> Reef Fish, (Large Nassau Grouper), who frequents the rec.scuba ng
> pointed the article out to me. He might know where to find it, I
> don't.
>
> What I read could be wrong,

It isn't you are correct.

> but I believe it. Plus, my pc has ample
> memory and hard drive space so it does not matter if I waste a byte or
> two.


--
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