Re: [tech-3d] Digest Number 42

["Don Lopp" <dlopp@xxxxxxxxxxxxxxx>]

To Mike- I miss spoke about the 75mm lens--I ment tosay  " what do you get
with a 75mm lens, one foot base , 75 ft to 2250 feet . Thanks, DON.
----- Original Message -----
From: <tech-3d@xxxxxxxxxxx>
To: <tech-3d@xxxxxxxxxxx>
Sent: Tuesday, December 05, 2000 12:36 PM
Subject: [tech-3d] Digest Number 42


>
> There is 1 message in this issue.
>
> Topics in this digest:
>
>       1. Re: Digest Number 41
>            From: "Don Lopp" <dlopp@xxxxxxxxxxxxxxx>
>
>
> ________________________________________________________________________
> ________________________________________________________________________
>
> Message: 1
>    Date: Mon, 4 Dec 2000 21:16:06 -0800
>    From: "Don Lopp" <dlopp@xxxxxxxxxxxxxxx>
> Subject: Re: Digest Number 41
>
> Miike thank you for taking the time to check me out Could you tell me what
> the numbers would be for-- 75mm lens  for 75 feet to  with a i foot base,
> 100mmlens 100 feet to 3000 feet , one foot base and finally 135 mm lens -
> 135 fee to 4000ft with a one foot base ?
> I realize that my symplistic plan would be worthless for close in stereo
> such as when they tried to shoot stereo of tSports Illustrated models last
> summer although common sense should have indicated  that itcould not be
done
> the way they attempted to do it allthough your system woul have indicated
> whether there was a way they could do it . They were partially saved by
> having some RBT 35mm cameras available though in my opinion the show
> presented in Phoenix was , in my opinion,one of the lousiest 3D shows I
have
> ever seen at a NSA convention ( I am referring to the technical aspects of
> the program -mostly too hyper). You are correct in assuming that I fine
tune
> my stereo base numbers based on previous experience such as any foreground
> verticles or lack of foreground verticles or when verticles are only on
> outer edges not in center( I believe that central verticles are not
usefull
> in my pictures- though not allways possible to avoid). A
> ----- Original Message -----
> From: <tech-3d@xxxxxxxxxxx>
> To: <tech-3d@xxxxxxxxxxx>
> Sent: Monday, December 04, 2000 11:50 AM
> Subject: [tech-3d] Digest Number 41
>
>
> >
> > There is 1 message in this issue.
> >
> > Topics in this digest:
> >
> >       1. Re: Stereo base calcuations
> >            From: "Michael K. Davis" <zilch0@xxxxxxxxxxxx>
> >
> >
> > ________________________________________________________________________
> > ________________________________________________________________________
> >
> > Message: 1
> >    Date: Sun, 03 Dec 2000 23:35:46 -0600
> >    From: "Michael K. Davis" <zilch0@xxxxxxxxxxxx>
> > Subject: Re: Stereo base calcuations
> >
> > Don,
> >
> > I ran your base calculation examples through the General Solution used
by
> > Bercovitz and others, to see what deviations they would produce.
> >
> > Here's what I got:
> >
> >  75mm lens with a 1-ft base,  75-ft Near and 3000-ft Far:  39.1% of
MAOFD
> > 100mm lens with a 1-ft base, 100-ft Near and 3000-ft Far:  29.1% of
MAOFD
> > 135mm lens with a 1-ft base, 135-ft Near and 3000-ft Far:  21.3% of
MAOFD
> >
> > So, the longer your lens, the less OFD you produce, using this approach,
> > and you're right - your images would all have less than maximum stereo
> effect.
> >
> > Your method is very interesting and I can tell you are able to predict
the
> > results you'll get as long as your subject distances match the
> > circumstances you describe.  When they don't, I suppose you are able to
> > interpolate the base, relying on your experience.
> >
> > Thanks for sharing it!
> >
> > Mike
> >
> >
> > >Date: Fri, 1 Dec 2000 22:39:19 -0800
> > >From: "Don Lopp" <dlopp@xxxxxxxxxxxxxxx>
> > >Subject: Re: Digest Number 36
> > >
> > >To Mike Davis reguarding stereo base- or 20 plus years I have been
using
> a
> > >simple way of figuring out the stereo base for taking hyper scenics.
For
> a
> > >135 mm lens I figure that the base of one foot gives me stereo depth of
> 135
> > >feet to infinity or five times 135  gives me a stereo depth  of 675
feet
> to
> > >infinity. For a 75 mm lens , I figure a one foot base gives me  a
stereo
> > >depth of from  75 feet to infinity. For a 100 mm lens, a one foot base
> gives
> > >me a stereo depth of 100 feet to infinity and so on. For a 100 mm lens
I
> > >figure that infinity is any thing past 3,000 feet, or 30 times the near
> > >point. I dont try to maximize the stereo effect in my pictues as some
of
> my
> > >best ones have a deviation of less than one mm. My mental state because
> of
> > >my use of methadone and morphine is such that I can not handle any
thing
> > >very complicated and it has been some 6 months since I have been able
to
> > >take any serious scenics-may be next year ? DON
> > >
> >
> >
> >
> >
> > ________________________________________________________________________
> > ________________________________________________________________________
> >
> >
> >
> >
>
>
>
> ________________________________________________________________________
> ________________________________________________________________________
>
>
>
>


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