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Thread: What kind of lens bends an image without distortion?

  1. #21
    Nodda Duma's Avatar
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    Re: What kind of lens bends an image without distortion?

    A scanning mirror (adjustable orientation first surface mirror) is the simplest optical device to accomplish this. Since you are forming an image with a camera, the negative or digital image can be correctly oriented in post processing.

    Same setup to accomplish the same thing you want is used quite commonly in aerial reconnaissance systems when gimballed cameras cannot be used.
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  2. #22

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    Re: What kind of lens bends an image without distortion?

    Well, yeah, sure but they don't really look around corners.

  3. #23
    Tin Can's Avatar
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    Re: What kind of lens bends an image without distortion?

    Images vastly preferred

    not game trying to


    focus


    In Time

  4. #24
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    Re: What kind of lens bends an image without distortion?

    Quote Originally Posted by Dan Fromm View Post
    Well, yeah, sure but they don't really look around corners.
    Needs a whole lot more than a "lens", and the fidelity leaves something to be desired, but just for the amusement:

    https://www.media.mit.edu/projects/l...ners/overview/

  5. #25
    Tin Can's Avatar
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    Re: What kind of lens bends an image without distortion?

    Good answer

    I expect we have better

    Quote Originally Posted by Oren Grad View Post
    Needs a whole lot more than a "lens", and the fidelity leaves something to be desired, but just for the amusement:

    https://www.media.mit.edu/projects/l...ners/overview/
    Images vastly preferred

    not game trying to


    focus


    In Time

  6. #26
    Nodda Duma's Avatar
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    Re: What kind of lens bends an image without distortion?

    Quote Originally Posted by Dan Fromm View Post
    Well, yeah, sure but they don't really look around corners.
    They do if you mount it at the end of a stick, or “precision aligned opto-mechanical structure” as it’s called in engineering terms.

    Btw assumptions and preconceived notions are the enemy of solutions. A cranky old Navy engineer once said that. There was also something about lack of detailed requirements. Paraphrasing...the actual quote is a bit, ah, too colorful for a public venue.
    Newly made large format dry plates available! Look:
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  7. #27

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    Re: What kind of lens bends an image without distortion?

    Quote Originally Posted by Nodda Duma View Post
    Btw assumptions and preconceived notions are the enemy of solutions.
    Absolutely. I thought everyone knew that. Another mistaken assumption.

  8. #28

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    Re: What kind of lens bends an image without distortion?

    SR71 camera...
    https://www.youtube.com/watch?v=jbZVom0QPrg

    Had a chance to see this same camera at Edwards Field some years ago. The mirror does double duty as a image stabilizer. Image of the electronics illustrates the Teledyne Philbrick operational amplifier modules that are essentially to the control systems in this camera. The moving slit shutter is a Sherman Fairchild invention aka Fairchild Instrument and Camera. During WW-II the Germans were obsessed with uber shutter speeds to freeze motion in their aero recon cameras. This couple with Uber large aperture long focal length lenses became a thing and goal for them. Sherman Fairchild figured out by synchronizing the slit shutter to the effective ground speed of the aircraft, uber shutter speeds were not needed to freeze frame per aero recon image. The German's ended up with a few aero recon images made with the Sherman Fairchild invention, could not figure out how it was done.. until they capture an entire camera.

    Teledyne Philbrick was the industry leader in operational amplifier technology back in the late 50's to very early 70's. Tragedy happened when the entire engineering team was killed in a aircraft crash. This ended Teledyne Philbrick's leadership in the area of operational amplifiers. Since that time, more than a few companies have implemented a policy of not allowing more than one key member of a design group to go flying on business trips.


    Bernice

  9. #29

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    Re: What kind of lens bends an image without distortion?

    fascinating responses!

    Quote Originally Posted by Nodda Duma View Post
    image can be correctly oriented in post processing.
    Not sure that would help in my case. The subject isn't visible thru in the viewfinder at all.

    Quote Originally Posted by Dan Fromm View Post
    Well, yeah, sure but they don't really look around corners.
    My subject isn't around a corner, it's just out of the frame.

    That guy claims he "figured out" the invisibility lens in 2010. I guess he means he figured out the Lubor Lens, invented by magician Lubor Fiedler, patent filed in 2002.
    https://patents.google.com/patent/US20030054894
    https://www.vanishingincmagic.com/cl...c/lubors-lens/
    Last edited by johnywhy; 31-Mar-2021 at 12:58.

  10. #30

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    Re: What kind of lens bends an image without distortion?

    Quote Originally Posted by johnywhy View Post
    My subject isn't around a corner, it's just out of the frame.
    Wider angle lens will see it.

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