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Thread: Penta Prism

  1. #1
    Join Date
    May 2009
    Location
    Charlotte, NC
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    155

    Default Penta Prism

    Can anyone explain the theory and application of a Penta prism?

    I've read what I can find in the description
    But not enough, I don't understand how they work

    BTW, NOTHING pops up on a search. :O

  2. #2
    Join Date
    Oct 2012
    Location
    Germany
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    1,059

    Default

    Aufruf zum Projekt "Müll-freie Meere" - https://reprap.org/forum/list.php?426
    Call for the project "garbage-free seas" - https://reprap.org/forum/list.php?425

  3. #3
    Join Date
    Dec 2008
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    veenwouden
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    Default

    Thanks for posting very interesting!!!


    Interested in a system or modules? Feel free to contact us directly!

  4. #4
    Join Date
    May 2009
    Location
    Charlotte, NC
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    Default

    Thank you. that explained the optics path at least.

    So Meredith Instruments has an Edmund Optics pentaprism corner for sale on ebay.

    https://www.ebay.com/itm/PENTA-PRISM...ty!28211!US!-1

    But other than UV and IR, are they practical for anything? I mean, how do the losses compare to a standard FS mirror?

    I find it strange they have never been mentioned either on here or LPF at all. Maybe they are just useless for almost anything?

    It seems like cameras use them extensively, instead of mirrors, which is obviously not IR or UV for the most part.
    Probably to prevent inverting the image.

  5. #5
    Join Date
    Oct 2012
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    Germany
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    Default

    ... prisms are used mostly for reducing build size and parts count - for this it should be better in respect of energy losses or thermal stability than other beam-folding optics ...

    Viktor
    Aufruf zum Projekt "Müll-freie Meere" - https://reprap.org/forum/list.php?426
    Call for the project "garbage-free seas" - https://reprap.org/forum/list.php?425

  6. #6
    Join Date
    Jun 2009
    Location
    St. Louis, MO
    Posts
    708

    Default

    A penta prism changes the light path by 90 degrees independent of the rotation of the prism - which is occasionally useful...
    "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

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