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3D-Printed Anaperture Single-Shot Anaglyph Aperture

Started May 21, 2016 | Discussions thread
ProfHankD
OP ProfHankD Veteran Member • Posts: 9,153
Re: 3D-Printed Anaperture Single-Shot Anaglyph Aperture

Boris Starosta wrote:

Did you never get any replies or inquiries about this post.

Nope... which is a bit odd, because it did get significant traffic on Thingiverse and my related Instructable got lots of traffic.

Have you ever heard of the Vivitar Q-DOS lens?

Of course -- I even bought one to do comparisons. The Q-DOS lens is shockingly terrible at anaglyph capture. There are two reasons:

  1. The effective aperture shape isn't circular for the Q-DOS, but mismatched opposing parts of a circle that make bokeh terrible.
  2. The filters come together in an excessively clever way, leaving a seam in the middle of the optical path. This seems to seriously disrupt focus quality.

Interestingly, the Q-DOS is actually one of the best of the Vivitar zooms when NOT used in Q-DOS mode, and my front-mounted filters actually produce very good quality anaglyphs with it.

If you look at the patent for the Q-DOS, it's pretty clear they didn't understand exactly how this works. No big deal -- most photographers and most image processing libraries have very wrong ideas about OOF PSFs (out-of-focus point spread functions). Honestly, I did too until I noticed the major differences between the models in image processing research papers and what I measured with actual lenses. My standard reader-friendly overview is A Poorly Focused Talk.

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