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Optics Theory - This forum is aimed towards the TECHNICAL side of photographic OPTICS THEORY. There will be some overlap by camera/manufacturer, but this forum is for the heavy duty tech discussions. This is NOT the place to discuss a specific lens or lens line, do that in the appropriate forum. This is the forum to discuss optics or lenses in general, to learn about the tech behind the lenses and images. IF you have a question about a specific lens, post it in the forum about that type of camera, NOT HERE.

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Old 09-17-2016   #41
ph.
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The issue raised above; how to convert a sphere to a flat plane remains and gets
worse the larger portion of the sphere you have to flatten. If in doubt, look at an ordinary Mercator projected map of Europe and Africa and compare the size of the southern continent with the size of Greenland. Then look up data on their real surface.

p.
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Old 09-17-2016   #42
sevo
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Quote:
Originally Posted by ph. View Post
The issue raised above; how to convert a sphere to a flat plane remains and gets
worse the larger portion of the sphere you have to flatten. If in doubt, look at an ordinary Mercator projected map of Europe and Africa and compare the size of the southern continent with the size of Greenland. Then look up data on their real surface.

p.
Yes and no. To avoid PROJECTION issues, the final medium (print, monitor or whatever) would have to spherical - the intermediary (sensor or film) can be any shape.
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Old 09-18-2016   #43
ph.
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Yes, two different issues here :

Lenses that are allowed to project their image on a sperical surface can have an easier time if designed to do so. Here the intermediary matters.

If the final output is organized so as to be printed on the inside of a goldfish bowl or on slightly spherical paper for slightly spherical picture frames, no problem in going from a surface sensor forming part of a sphere to the desired final result.

Projecting anyhing curved, spherical or simply a plane (at an angle) onto a flat surface entails distortion. Mercator is just one (very ancient) way of projecting a sphere onto a flat map. Any correction will need to add, "enlarge" or delete, "diminish" pixels. Expensive lens-by-lens correction will be replaced by a cheap once-and-for all program for all instances of that lens\sensor combo.
For a small solid angle piece of a sphere, the distortions will be correspondingly small.

A suitably crinkly and continuously malleable surface sensor might even correct for "moustache distortion" and adapt to lenses that change curvature of field with how their controls are set.

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