Flat lenses will revolutionise optics?

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Brian
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Flat lenses will revolutionise optics?

Post by Brian »

Brian
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David Frydman
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Re: Flat lenses will revolutionise optics?

Post by David Frydman »

Thanks, Brian.
Exciting prospects.
I did read something similar a few years ago.
Also at Imperial College theoretically it is possible to bend light so that an object disappears.
But the accuracy required is not yet available.
It is like masking in maybe Startrek.
Also presently Canon have DOI optics, which are interesting.
But these flat lenses seem like the best idea.
I think Philips, Holland had something similar?

Regards, David
David Frydman
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Re: Flat lenses will revolutionise optics?

Post by David Frydman »

Looking into this further it seems that this is not new technology.
It is just diffraction optics and Canon already use this in their DOI lenses.
I think there is a 400mm f/4 and 70 to 200mm? and maybe others. The zoom is about £600 secondhand, the 400mm considerably more.
These are combined diffraction optics elements and standard glass elements but reduce size and weight by maybe a third.
The Harvard quoted site shows only a DOI element 1mm across.
It may be there are new features but this is not fundamentally new.

Regards, David
Brian
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Re: Flat lenses will revolutionise optics?

Post by Brian »

Dear David,

thanks for clarifying this. The item does rather give the impression it's all new and cutting edge. Possibly it's the application, to fibre optic broadband systems, that's the cutting edge bit? Such an application would also require production of lenses on a massive scale I guess,

ATB,
Brian
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David Frydman
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Re: Flat lenses will revolutionise optics?

Post by David Frydman »

Dear Brian,
The Canon lenses were developed in the 1990s.
Currently there is the 400mm f/4 and 70 to 300mm zoom.
At a few thousand pounds and maybe £600 to £800 secondhand for the zoom.
I think there were others.
It is actually called DO IS not DOI,
That is Diffraction Optics Image Stabilization.

There are, however, some problems optically with these in that the DO optics may not always equal the larger normal optics equivalent in absolute resolution or maybe contrast.
I have been told what these differences are but have forgotten.
I don't use Canon so have never tested them, although the Canon IS binoculars when skillfully used are unmatched by any normal binocular.

There is currently a lot of discussion in professional optical design chatrooms.
But some of the professionals are saying they have just reinvented the wheel.
I think within a short time it will become clear if the Harvard work has some real advantages.

At Imperial College they have at least partially achieved the cloaking effects in Startrek that the Klingon? use.
I think the problem is the accuracy necessary is not yet achievable.

When you consider recent inventions like molecular thickness incredibly strong materials then new inventions will revolutionise the way technology progresses and the way we build and use things.
There is also huge theoretical work on batteries with claims that electric powered car batteries could weigh one hundredth what they now weigh.

Some cloud gaps now and blue patches after a rainy and cloudy day.

Best regards, David
David Frydman
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Re: Flat lenses will revolutionise optics?

Post by David Frydman »

Notice this morning that there is an excellent condition Canon 70 to 300mm IS USM DO f/4 to 5.6 in a good camera shop in Reading.
If anyone wants this type of Diffractive Optics lightweight smaller lens, the price is good and sometimes if you ask you can get some sort of discount.
Usually 6 months shop guarantee.

I have not seen it so I cannot say how good it is, but someone with a Canon DSLR body could try it out.
Not sure how good they are on stars.

Regards, David
Eclipse
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Re: Flat lenses will revolutionise optics?

Post by Eclipse »

David Frydman wrote:Also at Imperial College theoretically it is possible to bend light so that an object disappears.
Didn´t ´Q´ do that with a car in one of the Bond movies?
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Cliff
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Re: Flat lenses will revolutionise optics?

Post by Cliff »

Dear Brian, David and Eclipse
Ummm!!!!!! ??????
All this "new" technology stuff (assuming it might be new) might be good for us ?
But where is it getting us.
The Industrial Revolution caused wonders that many of us have benefitted from.
Technology moved on and Drones have taken out terrorists.
Then just recently a soldier got the Military Cross for leading a bayonet charge - What AMAZING COURAGE using limited technology !
In future I think Bankers might do alternate 6 months banking and 6 months in Afghanistan only getting bonuses when they do a bayonet charge.
Best wishes from Cliff
David Frydman
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Re: Flat lenses will revolutionise optics?

Post by David Frydman »

Maybe a bank charge.

Regards, David
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