Forgotten in its old age

by Aditya

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I read once, in a book, about a lens that was an "inverse fisheye". Basically a hemispherical mirror mounted at one end of a glass tube.

I can't remember what it was called, nor can I find any record of its existance on the internet. Sadly, I no longer have the book to be able to reference it.

Has anyone heard of such a thing, and can name it, or better yet, got one, and some photos from it?

here's a drawing

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1 Answer 1

up vote 18 down vote accepted

That's a one-shot 360° panoramic lens. There are a number of examples out there with different mirror shapes; two of the currently-active vendors are

They use different mirror shapes -- the 0-360 version is similar to your drawing, while the EGG is more like what would be left after a circle is swept out of a cylinder, so the effect (as a flat picture) would be different. The EGG is the only current one I could find that didn't have the mirror exposed and at the end of a long, delicate-looking stalk, but since I'm not looking for such a lens myself, I didn't spend a lot of time searching.

(When I wanted a 360° panorama in the film days, I rented a slit-shutter revolving camera. It opened the shutter and rotated the camera through a full circle while advancing the film -- sort of like a flatbed scanner for the world.)

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4  
Wow that's amazing that someone identified and found a lens (type) based on a basic hand drawing! I'm impressed. –  thomasrutter Mar 9 '11 at 16:17
    
Not as impressed as I am. –  Tom O'Connor Mar 9 '11 at 18:19
2  
I think it's rather worrisome and indicates some major deficiencies in parts of my life that ought to have seemed more important... –  user2719 Mar 9 '11 at 18:46
    
Unfortunately the EGG Solutions link no longer works :( –  James Youngman Apr 9 '12 at 18:25

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