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Re: [PSUBS-MAILIST] Fish eyes
Hi, Pierre - luckily that's a small enough size that you can buy one and see
how it works. I'm not sure how different plexi is compared to
polycarbonate. Different planes of refraction I suspect. Let us know the
results if you try it out.
Rick L
----- Original Message -----
From: "Marie-Andrée et Pierre" <poulin.carrier@videotron.ca>
To: <personal_submersibles@psubs.org>
Sent: Monday, September 04, 2006 4:39 AM
Subject: Re: [PSUBS-MAILIST] Fish eyes
> Hi Rick,
>
> Thanks for your reply. And I understand what you say.
>
> But I was thinking more of a 4inches diameter sphere. To act as a rearview
> mirror. With the inside being completely flat. would it shrink all the 180
> deg. of view into the small 4" flat glass? Or a smaller portion like 120
> deg? Mainly used to detect object. not for sight viewing.
>
> Pierre
>
>
> ----- Original Message -----
> From: "Rick and Marcia" <empiricus@telus.net>
> To: <personal_submersibles@psubs.org>
> Sent: Monday, September 04, 2006 1:52 AM
> Subject: Re: [PSUBS-MAILIST] Fish eyes
>
>
> > Salut, Pierre . . .
> >
> > If you have the chance visit an aquarium. They may have a tank with a
> > half-sphere. You'll be able to poke your head into the window for a
first
> > hand look at the distortion.
> >
> > It's not all that bad. The view is fantastic, you don't get any really
> > funny distortions unless the window itself is uneven. You may consider
a
> > tear drop shape, too. You can still insert your head into the window to
> > look behind you but the window is much more hydrodynamic.
> >
> > If the window will stick out on your sub, consider having it made in
> > polycarbonate (Lexan) instead. Acrylic (Plexiglas) is extremely well
> > studied for pressure applications, but, Lexan is MUCH more collision
> > resistant and is great for an ambient boat.
> >
> > BTW, you will not get the same fish-eye perspective as a camera lens.
> > Different principles. Hope this helps.
> >
> > Rick L
> > Vancouver, Canada
> >
> >
> > ----- Original Message -----
> > From: "Marie-Andrée et Pierre" <poulin.carrier@videotron.ca>
> > To: <personal_submersibles@psubs.org>
> > Sent: Sunday, September 03, 2006 6:27 PM
> > Subject: [PSUBS-MAILIST] Fish eyes
> >
> >
> >> Hi guys,
> >>
> >> I saw a video of the sport sub ambient sub.
> >>
> >> I noticed that on each side of the sub there are small windows that are
> >> half-sphere. The windows seems to be very thick.
> >>
> >> I was wandering since my sub have many blind spots (in fact, I can only
> > see
> >> strait forward and up) that if I put half sphere of acrylic as window,
> > would
> >> I see 180 deg. around? Then eliminating blind spots on the side? I'm
> >> aware
> >> that if that does work distortion would be... interesting at best. But
I
> >> could see if I am close to an object or to see where is that scuba
diver?
> >>
> >> Anybody tried that before?
> >>
> >> Remember that my sub is an ambient sub and that there will be no
pressure
> > on
> >> the windows. So I can build them pretty much as I like it.
> >>
> >> Pierre "fish eye" Poulin
> >>
> >>
> >>
> >>
> >>
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