[rollei_list] Re: Heidoscop stereo-test
- From: John Wild <JWild@xxxxxxxxxxxxxxxxxxxxxx>
- To: "rollei_list@xxxxxxxxxxxxx" <rollei_list@xxxxxxxxxxxxx>
- Date: Mon, 8 Oct 2012 10:44:45 +0100
There must be a slight horizontal 'misalignment' to create the 3D effect.
If you look at a telegraph pole - for example - against the edge of a
building. When you close one eye and then the other, you will see the
position of the pole change in relationship to the building. This is what
gives us the ability to see in 3D and to estimate distance. The two film
frames have that same 'shift'.
John
On 07/10/2012 23:17, "CarlosMFreaza" <cmfreaza@xxxxxxxxx> wrote:
> 2012/10/7 Chris Burck <chris.burck@xxxxxxxxx>:
>> the lenses appear to have been slightly out of alignment.
>
> I think both images have the right slight difference to get the stereo
> effect, at least I got this effect right now on the screen using a
> black cardboard mask with two square apertures for each eye, it
> requires a bit of practice for the right distance and the way to cross
> the eyes to see the images as one,but you finally get the depth
> perception; the larger image clicking on the thumbnail is too big for
> my mask, but the thumbnail worked fine, the image loses a bit of
> sharpness because you need to look the photographs too close on the
> screen, but the stereo effect is there. I forgot to mention the
> Heidoscop taking lenses are two Carl Zeiss Jena Tessar 4,5/75mm or
> 7,5cm focal length.
>
> Carlos
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