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Thread: plastic optics

  1. #21
    Mustafa Umut Sarac's Avatar
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    Newest optical poşymers still have lower abbe number than a 70 years old Leica glass and it makes they have more aberrations. Refractive indexes are lower also. There are many magic polymers out there but they are very expensive at US.

    Lens mold making is a extremelly high technology and slow process. May be material goes out of tolerances at mold quickly.

    There are hundreds of different glasses from glass manufacturers but not more than 20 with polymers , this is the problem.

  2. #22
    David Lyga's Avatar
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    WOW, most of this is well beyond my humble brain.

    But, at least theoretically, I do get the impression that (hypothetically), optical parity could be achieved. - David Lyga
    Last edited by David Lyga; 05-14-2013 at 08:27 AM. Click to view previous post history.

  3. #23
    Peltigera's Avatar
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    Wouldn't want to go back to glass lenses in my spectacles!

  4. #24
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    Quote Originally Posted by Peltigera View Post
    Wouldn't want to go back to glass lenses in my spectacles!
    +1
    WYSIWYG - At least that's my goal.

    Portfolio-http://apug.org/forums/portfolios.php?u=25518

  5. #25

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    I've used up my current photo budget. (And I just have to exercise restraint in retirement) But I see lots of toy cameras I'd get in a heartbeat, all with plastic lenses. The Diana 110 camera, (the two lens kit), a Diana Mini, a Holga 6X12 panoramic with the 90mm plastic lens. Those three intrigue me the most.

  6. #26

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    I had a Nikon kit lens which I believe had some plastic elements: the 28-80mm f/3.3-5.6G. The lens mount was plastic too! The images I got from the lens were just fine, plus I had no problem getting it wet and dirty because it was practically disposable. Fast autofocus too. I did hate the awful, awful focusing ring and the lack of an aperture ring.

    I gave it to my brother a while ago; I should steal it back.

  7. #27
    bobwysiwyg's Avatar
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    LJ, I have this lens as well and no issues. As near as I can tell the front element at least is plastic. I will say one thing, the darn thing is light as a feather.
    WYSIWYG - At least that's my goal.

    Portfolio-http://apug.org/forums/portfolios.php?u=25518

  8. #28

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    Because of plastic "hybrid" aspherical elements, lenses exist today that would simply not have been conceivable without such technology. The practical application of this technology has created an amazing plethora of zoom lenses that are both cheap and optically excellent; for an example, look at what's attached to any digital camera; e.g. the omnipresent 28-300.

  9. #29
    Photo Engineer's Avatar
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    Kodak had a huge R&D program directed to the commercialization of plastic lenses. This was the basis of the pocket and 126 cartridge cameras. Virtually everything was plastic and easily mass produced. Todays disposable cameras use plastic lenses. Some of the early basic patents were held by EK starting in the 60s.

    PE

  10. #30

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    Konica made several three versions of its 35-70mm zoom in AR mount. The first was a one touch fixed f/3/.5. It is a decent performer but not the most mechanically stable. The second was two touch fixed f/4. This one is also a good performer and is much more sturdy. The third one is also a two touch but has a variable aperture of f/3.5-4.5. It has a plastic aspherical rear element. The instruction book warns against cleaning the rear element improperly. The lens is so light is doesn't feel real. The performance is good. The problem is focusing it in low light. The microprism or split image focusing aids black out. I can only use it because I have an FT-1 body with a Nikon E screen inside. The Canon 35-105/3.5-4.5 New FD also uses an aspheric element but that one is made of glass, not plastic. The design and speed allow the lens to be be much smaller and lighter than the earlier fixed f/3.5 version. It is a good performer but does not handle flare situations well. For the time being plastic elements can be part of high quality lens designs but can't replace all glass elements.

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