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Thread: Interesting article on lens design

  1. #1
    Peter De Smidt's Avatar
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    Interesting article on lens design

    May tomorrow be a better day.

  2. #2
    Tin Can's Avatar
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    Re: Interesting article on lens design

    Yes, but I prefer soft corners.

    I find sharp images to the very edge of rectangles harsh.

    Most likely, as I grew up on old tiny TV with round corners.

    I recall being in a room full of people watching the only TV in the area, of The Beatles on B&W 8" console like below.

    Nobody was allowed to get close or block viewing, so it was really odd, bad sound too. Smelly old people in control.

    Perhaps my first TV screen ever. The next TV memory was JFK assassination.

    Old TV by TIN CAN COLLEGE, on Flickr
    2022

  3. #3

    Re: Interesting article on lens design

    Did you ever take pictures of the TV screen? 1/25 second or you didn’t get the whole screen. I took the lunar landing with the banner “ Live from the moon” across the top. Horrible resolution, but the sound was better than my 1st digital TV.

  4. #4

    Re: Interesting article on lens design

    PS, Love the TV! Looks like a face .

  5. #5
    Exploring Large Format Exploring Large Format's Avatar
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    Re: Interesting article on lens design

    Quote Originally Posted by Tin Can View Post
    Yes, but I prefer soft corners.

    I find sharp images to the very edge of rectangles harsh.

    Most likely, as I grew up on old tiny TV with round corners.

    I recall being in a room full of people watching the only TV in the area, of The Beatles on B&W 8" console like below.

    Nobody was allowed to get close or block viewing, so it was really odd, bad sound too. Smelly old people in control.

    Perhaps my first TV screen ever. The next TV memory was JFK assassination.

    Old TV by TIN CAN COLLEGE, on Flickr
    Thanks for the memories! I remember when the Beatles were on Ed Sullivan, and my older sister had to wash her hair. She asked me to let her know when they came on. I told her, and she came running and screaming into the living room, hair dripping wet. On the TV with the round corners and terrible reception of 4 stations. Later, yes, the moon landing.

    Sent from my SM-G981V using Tapatalk

  6. #6

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    Re: Interesting article on lens design

    "Looks like a face." ...a spider face (spiders have eight eyes).

  7. #7

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    Re: Interesting article on lens design

    Photography blogs write about optics very badly.

    These papers are a clever solution to an analytical mathematical problem, and maybe some derivative of the technique will trickle into lens design methods. But the solutions are only of mathematical interest at the moment. For example, in the first paper, they calculate lenses of complex shapes that correct spherical aberration perfectly, but only calculate on-axis.

    The actual task of the optical designer is to balance several constraints such as on-axis, off-axis aberrations, curvature of field, ease of manufacture, error budget, etc. Allowing non-spherical lens surface shapes helps meet some of these constraints (more complex recent photographic lenses often have a few aspherical surfaces). But, perfectly meeting one constraint without regard to any others is not how real lenses are designed. It's interesting that it can be done, but theoretical at the moment.

  8. #8
    Joe O'Hara's Avatar
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    Re: Interesting article on lens design

    Tin Can: That looks like a real antique-- the Dumont that I grew up with would look modern next to it. Do you recall the brand?

    By the time I was in double digits, the Dumont was down as much as it was working (it had 38 tubes in it IIRC). It was on the fritz in November of 1963 so I missed the whole thing.

    The good part is that I never got used to having a working TV around so I never got the TV habit. Today I never watch it at all. No great loss I think.
    Where are we going?
    And why are we in this handbasket?


    www.josephoharaphotography.com

  9. #9
    Tin Can's Avatar
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    Re: Interesting article on lens design

    No, kids like me were not allowed close enough to see the name

    I got even by making a simple TV jammer age 10, TV only worked when I was allowed to watch

    I have collected all kinds of early gadgets. 1930's Wire Recorders, console phonographs. 78 RPM record makers. I still have 3 old radios

    Father threw it all away every move, we moved often, so I still collect

    Round TV by TIN CAN COLLEGE, on Flickr

    Round 2 by TIN CAN COLLEGE, on Flickr



    I bought one of these for $50, 30 years ago and tried to fix it, gave up and installed a 13" inside behind the glass. Fooled a lot of people.
    2022

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