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Thread: 3 piece cycdrical correction?!?

  1. #1
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    Apr 2010
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    Default 3 piece cycdrical correction?!?

    Could someone explain to me the use of the 3 piece correction lens and benifit over the two piece. Link to the 3 piece in question. http://goldenstarlaser.com/index.php...product_id=461

    Thanks
    leading in trailing technology

  2. #2
    Join Date
    Feb 2008
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    Hungary
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    Quote Originally Posted by polishedball View Post
    Could someone explain to me the use of the 3 piece correction lens and benifit over the two piece. Link to the 3 piece in question. http://goldenstarlaser.com/index.php...product_id=461

    Thanks
    Same as Ebay "techood" lenses.
    I don't like this, the lenses small and the lens ratio is unknown. (4x or 6x??). The lens adjust is little bit difficult than two part lens set.
    I prefer OPT laser 6x cylindrical lens or (Dave) lasershowparts 6x cyrindrical lens pair.

    OPT: https://optlasers.com/cylindrical-le...n-ar-400-700nm
    Dave: https://www.ebay.com/itm/Cylindrical...QAAMXQUmFSkuyf
    3 x 2w DIY RGB projector
    2 FB3
    Pangolin Beyond Ultimate and Pangolin Quickshow
    .

    My some show videos: https://www.youtube.com/channel/UC4Q...vDRS2QA/videos

  3. #3
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    There must be some benefit to this arrangement of 3 lenses as compared to just two standard cylindrical lenses (or two anamorphic prisms, for that matter). The reason I say this is because you see this 3-element arrangement for secondary (fast-axis) correction in many designs - not just the ones from Goldenstar.

    I can understand why some people would prefer a simpler arrangement with just two optical elements. But I'd like to know what sort of advantage this 3rd lens offers...

    Adam

  4. #4
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    Jun 2009
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    Sometimes the radius of a lens won't fit the form factor. In that case two lenses can accomplish the task. But some of the three lens sets on ebay appear to have two positive lenses, it could be the same case, but another possibility is one negative and one positive could form a beam expanding and collimating system for one axis and the other positive lens is the collimator for the other axis.
    "There are painters who transform the sun into a yellow spot, but there are others who, with the help of their art and their intelligence, transform a yellow spot into the sun." Pablo Picasso

  5. #5
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    Youngstown OH temporary
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    Optics is nonintuitive...
    The explanation I hear most is that it's exponentially cheaper to make (accurate) longer focal length lenses.
    So you end up with multiple longer lenses instead of one very expensive short one.
    -Dan Barlow
    Science! Constantly shifting collection of auction purchases, group buys, dumpster dove, and handmade lasers of all types.
    Looking for work as R&D Tech/Assistant! Can locate anywhere.

  6. #6
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    A guess.

    one set brings fast and slow axis to same expansion rate then the combined with third fixes the overall divergence with expander?

  7. #7
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    Jun 2009
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    https://www.newport.com/n/beam-shapi...ndrical-lenses

    It doesn't mention the use of negative lenses, but the combination would allow you to hit a smaller final output beam size - with, of course, worse divergence...
    "There are painters who transform the sun into a yellow spot, but there are others who, with the help of their art and their intelligence, transform a yellow spot into the sun." Pablo Picasso

  8. #8
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    Apr 2009
    Location
    Seattle, WA
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    Pretty sure its for use with fiber corrected reds.... thats how i use them.

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