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Thin lens?

 
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ChrisR
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Joined: 14 Mar 2009
Posts: 7966
Location: Near London, UK
PostPosted: Thu Oct 11, 2018 7:39 am    Post subject: Thin lens? Reply with quote
https://insights.globalspec.com/article/10056/a-first-for-flat-lenses-full-color-imaging

Some of the right side "related links" are interesting too.
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MarkSturtevant



Joined: 21 Nov 2015
Posts: 394
PostPosted: Wed Oct 17, 2018 6:45 pm    Post subject: Reply with quote
I have heard about this from time to time. A cool bit is that the lens can be printed directly onto a camera sensor. If this product becomes viable, I wonder if you could wear your camera like a wrist watch.
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Mark Sturtevant
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rjlittlefield
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Joined: 01 Aug 2006
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Location: Richland, Washington State, USA
PostPosted: Wed Oct 17, 2018 9:40 pm    Post subject: Reply with quote
MarkSturtevant wrote:
A cool bit is that the lens can be printed directly onto a camera sensor.

I know that's what the narration says, but I think they've played a bit fast and loose with that idea.

My understanding is that the technology is rather like a Fresnel lens carried to the limit. It makes the lens itself thin, but does not remove the need to have the lens separated from the sensor by a distance basically equal to the lens's focal length. You could certainly cover a large sensor with an array of such lenses having short focal length, each pointing is a different direction, but then you'd run into the problem that each lens would have only a tiny aperture and thus low spatial resolution in the far field, rather like an insect's eye.

If that interpretation is not correct, I would greatly appreciate some references that could set me straight on the issue.

--Rik
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