re:Single lens 3D questions

[P3D <PK6811S@xxxxxxxxxxxxxx>]

Peter Davis wrote:

>   1)	Colors which are close to the red and cyan of the system's
>	filters exhibit strong retinal rivalry.  They appear to

Yup.  Can't do much about this one except avoid or discard images
with the problem.  A different choice of filters _might_ give a little
relief.  The problem is worsened when the filter transmission
spectrum is too narrow, causing one filter to pass no light from an
object, while the other passes a great deal.  If the 'off' filter could
provide even a little light it would be better, and most 'colors' out there
are really combinations of diverse wavelengths.

>   2)	Since the system depends on shallow depth of field, the
>	effect works best with a wide aperture, so much of the
>	picture is out of focus.  Our eyes also have a limited

The concept does NOT depend on shallow depth of field, it is the Q-dos
implementation that causes this.  Masking the two filters with smaller
apertures will increase depth of field.  Average separation of the
two apertures determines the amount of 3D-depth recorded, while size
of the apertures determines the amount of 3D-depth recorded in focus.

>I can't think of a reason for the black stripes.  My understanding is
>that the filters would be more effective if they actually abutted in
>the center, with no separation.

That will decrease the average separation (sacrifice 3D-depth) and
open the apertures (sacrifice depth-of-field).  But also balance unwanted
colorization at the sides of the image.  BTW, do you notice red and
blue shading at the sides of your pics?  I keep hoping this can be
avoided with some aperture mask I haven't come up with.

>Does anyone know how much work it would be to replace these filters?
>I really like the switchability of the Q-dos, and that would be hard
>to achieve with any other lens.

If anyone would like to donate a Q-dos my way I would be happy to do
some experimentation :-)

Paul Kline
pk6811s@xxxxxxxxxxxxxx


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