On Thu, 11 Mar 2004 15:11:09 -0600
Geilfuss Charles <Charles.Geilfuss@xxxxxxxxxxxxxxxxx> wrote:
> Thomas,
> Do you have the proper housing for YOU to go to 100 meters!?
>
OT, I'm sorry, but just to answer...
Well, Charles, as you know the body is mostly water -- which for pratical
diving purposes is incompressible. All human air-spaces can be equalized,
so I am crush-proof to much deeper than 100m ;) Nitrogen narcosis and oxtox
are the biggest issues at depth, but only when breathing air --
Helium-dillutant is the answer to these things (and you get that funny
donald-duck voice as an additional bonus). That only leaves thermal
protection, as well as the problem of comming back to the surface after
absorbing inert gasses at high partial preasures, but drysuits and a good
decompression-schedule takes care of this.
Comex (french comercial diving operation) have gone to 701m (in a chamber,
breathing a hydrogen-oxygen mix) and regularly do working dives at 300+ m
-- as do the US navy. I do not know of any UW camera housing for
off-the-shelf consumer cameras, which can sustain these depths, though ;(
Me, I only occationally go below 60m since the expenses of Helium as well
as the logistics (you need lots of gas at depth) are quite extensive and
air just is nasty below 60m. Below 100m, and you need excessive amounts of
logistics in place, and it's hardly worth it for just recreational diving
-- 60-100m is possible, but only worth it if there really is something to
see. Still, in those cases where there is something worth going down for,
it's probably also worth photographing.....hence.....
Sorry for the OT stuff. I'll try to moderate myself...
--thomas
> Charlie
>
> -----Original Message-----
> From: Thomas Heide Clausen [mailto:omlist@xxxxxxx]
> Sent: Thursday, March 11, 2004 4:08 PM
> To: olympus@xxxxxxxxxx
> Subject: [OM] Re: UW OMography?
>
>
>
> Charles,
>
> On Thu, 11 Mar 2004 14:51:09 -0600
> Geilfuss Charles <Charles.Geilfuss@xxxxxxxxxxxxxxxxx> wrote:
>
> > Thomas,
> > I don't claim to know anything at all about UW photography, but I
> > happen to have a B&H catalog here at work (just HAPPENED to...yeah
> > right).
>
> Hmm.....purely coincidential, right? ;)
>
> > Anyway, browsing through their catalog I see a product by EWA-MARINE
> > that is a group of camera housings for P&S cameras, Autofocus SLR and
> > Manual focus SLR. They appear to be made for multiple brands. From the
> > little photo I don't think they would allow the use of a large
> > strobe-type flash but do seem tall enough for a top mounted shoe flash.
> > They don't give a depth
>
> Well, I'll probably use some external canister lights anyways,
> flood-light type lighting. So it'll just be a matter of color balance,
> not quantity of light.
>
> > rating but from the appearance I don't think they would go below 5-10
> > meters(but that is shear guess). Have a look at www.bhphotovideo.com
> > and search for the above name.
>
> Well, 5-10m is definitely too shallow for what I intend to do. I need a
> house rated to at least 40m, preferably 100m (which, incidentially, seems
> to exclude most, if not all, current housings for digicams....)
>
> Thanks anyways
>
> --thomas
>
>
> >
> > Charlie
> >
> > -----Original Message-----
> > From: Thomas Heide Clausen [mailto:omlist@xxxxxxx]
> > Sent: Thursday, March 11, 2004 3:36 PM
> > To: olympus@xxxxxxxxxx
> > Subject: [OM] UW OMography?
> >
> >
> >
> > Gentlefolks,
> >
> > I was wondering....do anyone have any experiences regarding
> > UW-photography using our beloved OM's? I've been considering for a
> > while that it might make for a viable solution (nice fast glass),
> > however I've not seen any UW-housing for OMs....I assume that such
> > exists, though, but I've not managed to find it anywhere.
> >
> > The two viable alternatives seems, to me, to be a digicam + an UW house
> > or a Sea&Sea MMIII -- but I'd much love to be able to use an OM. Any
> > listees with experience with this?
> >
> > Thanks.
> >
> > --thomas
> >
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> >
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> >
>
>
> --
>
> ------------------------------------------------
> Thomas Heide Clausen
> Civilingeniør i Datateknik (cand.polyt)
> M.Sc in Computer Engineering
>
> E-Mail: T.Clausen@xxxxxxxxxxxx
> WWW: http://voop.free.fr/
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--
------------------------------------------------
Thomas Heide Clausen
Civilingeniør i Datateknik (cand.polyt)
M.Sc in Computer Engineering
E-Mail: T.Clausen@xxxxxxxxxxxx
WWW: http://voop.free.fr/
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