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I assume it's just very narrow FOV and not achromatic.

• dotancohen 4y ago
  From the fine article: > The only parts of the lens that can’t be 3D printed are the > glass optics, and for this Steele used Surplus Shed to > acquire achromatic (two-part) lenses.
  • ben_w 4y ago
    I can’t help but feel that’s no longer "3D print… a… lens". Everything else? Sure, nice job, but not exactly surprising.
    • dotancohen 4y ago
      In photography, a "lens" generally refers to the mechanical component that houses the optical lens. In 3D printing, "print" generally refers to "most of the device, except those components that one versed in the field would recognized as being composed of materials not suitable for printing". Though I do agree with you, many people who do 3D printing would not find the title misleading.
      • kabouseng 4y ago
        Nope, a lens holder is the mechanical component. Most people and people in industry would refer to either the optical element(s) or the complete assembled optic as the lens.
        • dotancohen 4y ago
          I am referring to the complete assembled optic.
      • Kye 4y ago
        >> "In photography, a "lens" generally refers to the mechanical component that houses the optical lens." Where did you hear this? I probably see people use "glass" to refer to lenses as often as I see "lens."
        • dotancohen 4y ago
          Try Google Images: https://www.google.com/search?q=photography+lens https://www.google.com/search?q=photography+lens You'll see not a single glass lens by itself, but rather every image will be of an assembly containing optical lens intended for mounting to a camera. Also, enter any photography store and ask to see the lenses. You'll not be presented with discrete glass, but rather with assemblies containing glass intended for mounting to a camera. Perhaps in the eyeglass industry the term "lens" refers to the glass itself as a discrete component, but not in photography.
          • Kye 4y ago
            • rroot 4y ago
          • deleted 4y ago
            [deleted]
          • dekhn 4y ago
            In the imaging industry the lens assembly is normally called an objective. In every field I've worked in, the lens is the glass and nothing more. If photography uses this term, it's wrong, but if it's established... who cares, just know that fact and move on.
            • Kye 4y ago
              It makes sense in photography where we don't really deal with or think about individual lens elements aside from people who repair their own, or when some new kind of element appears. We also call the whole assembly glass sometimes, though some people think it's pretentious. It's more common in blogs/YouTube/etc than in actual practice where focal lengths and f-stops are usually the main language of lenses.
    • dekhn 4y ago
      The issue is that while you can print 3d lenses (fun read: https://formlabs.com/blog/creating-camera-lenses-with-stereolithography/ https://formlabs.com/blog/creating-camera-lenses-with-stereo...), it's just not practical unless you're super into the project (similar for telescope makers who grind their own lenses). The long and short of it is that high quality glass is an industrial process that has hundreds of years of refinement to give you excellent image quality at very low prices. That said, I have cnc'd a piece of acrylic, polished it, then used it to make a silicone mold and used that to make an epoxy lens.