Why not square lenses???

Discussion in 'Beyond the Basics' started by NateS, Aug 7, 2008.

  1. NateS

    NateS TPF Noob!

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    So I was just thinking. The sensor and mirror on a camera are square/rectangular, the image comes out when viewed as a square/rectangle.........so why are lenses round? Wouldn't it seem logical that a lens would be squared? If so, I would think you could get ridiculously wide angle and you would have less problems with vigenetting.

    Any thoughts?
     
  2. Steph

    Steph No longer a newbie, moving up!

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    Round lenses are much easier to manufacture?
     
  3. matt-l

    matt-l TPF Noob!

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    and use. how would you focus a square lens? or hold it, it would not be comfy at all.
     
  4. NateS

    NateS TPF Noob!

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    I wouldn't know why. Once they got the process down it shouldn't be any harder. If anything I'd almost think it would be easier. Maybe the bulk, but some of these pros don't care about bulk with their 6 foot long lenses.
     
  5. NateS

    NateS TPF Noob!

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    Focus would be easy. Use a push/pull focus mechanism like the older Nikon 80-200 f2.8's.
     
  6. Garbz

    Garbz No longer a newbie, moving up!

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    Missing a big point here. Think of how light bends, and then think of the aperture. Look specifically at 5 bladed lenses. Out of focus light sources are rendered as pentagons. The more blades, the more curve, the smoother the out of focus areas are.

    The reason square lenses don't exist are the same reason that mirror reflex lenses are so unpopular. They would just produce a very crap image.

    (Logical deduction here. I only assume it works like this. Wait for a Helen comment to see if I'm right)
     
  7. Battou

    Battou No longer a newbie, moving up!

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    I used to work in a steel mill, on the tube mill to be precice. Square tubing is a PITA to manufacture and is actually very low demand in comparison to standard round tubing. Any tube mill manufacturering the square tubing for a square lens would have to be conducting change over a lot. Change over from round tubing to square is a long time consuming task. Resulting in higher prices due to additional labor required to produce. It took our Senior mill opperator sixteen hours to cunduct change over for a thirty six hour run of square tubing where as a diameter change takes a matter of minuets in most cases. just not worth it.

    and that is well before you even get to the optics part of it.
     
  8. Steph

    Steph No longer a newbie, moving up!

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    I don't know. My common sense tells me it is easier to spin a circular piece of glass to cut/grind/polish it into a lens element than to do the same with a rectangular one...
     
  9. snowalker

    snowalker TPF Noob!

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    good point! I've been never thinking like this.
     
  10. benp2k6

    benp2k6 TPF Noob!

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    What shape is your eye? Geometrically speaking a square lens is illogical
     
  11. nynfortoo

    nynfortoo TPF Noob!

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    Isn't some of the glass in a lens concave/convex and almost parabolic?
     
  12. Antithesis

    Antithesis No longer a newbie, moving up!

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    That's my exact thought on the subject, and also, the manfacturing would be far more difficult. Producing a perfect circle is far easier than producing a perfect square.
     

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