Re: Weird Curved Sunstar with Voigtländer 10/5.6 Lens
k-h.a.w wrote: So indeed, distortion correction for architectural straight lines seems to follow one set of rules.
However, curved rays of Sunstars seem to follow a different set of rules.
So far, I have never noticed this behavior for any different kind of lens.
Well, we better start looking.
Also, as long as one avoids Sunstars from very intense point light sources, lens distortion corrections required seem fairly benign.
But Sunstars seem to create their own set of problems.
I wonder though if Cosina Voigtländer are aware of this issue?
Next question, how to redesign the lens to avoid this ray curvature problem.
K-H.
Distortion of lenses does indeed vary with object distance. For some lenses the effect is more pronounced. What is special here, is that even though the sun is at infinity, the sunstar rays are generated from diffraction which happens in the lens iris. The object distance for the the sunstar rays is thus extremely short.
Sep 16, 2016 at 01:53 AM
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