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Thread: 4x or 6x Cylinder lens pair group buy

  1. #1
    Join Date
    Nov 2005
    Location
    Melbourne, Australia
    Posts
    3,694

    Default 4x or 6x Cylinder lens pair group buy

    Hi Guys,

    I'm again out of these. Thought I might as well do a group buy if anyone is interested and pass on some savings.

    Another group buy for the same lenses as per last time?

    Lens sizes are as follows:

    Convex lens - 12mm high by 10mm wide
    concave lens - 12mm high by 6mm wide

    Mag ratio: 4x magnification or 6x magnification

    Material:BK7
    Surface Quality:60-40
    Coating:AR A:350-650nm

    Per set if we get to 50 sets, they will work out at $40AUD inc PP and airmail shipping costs

    Add name qty below
    KVANT Australian projector sales
    https://www.facebook.com/kvantaus/

    Lasershowparts- Laser Parts at great prices
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  2. #2
    Join Date
    Apr 2010
    Location
    Grand Rapids, Mi
    Posts
    2,433

    Default

    Any chance mounts will be an option to add?


    Quote Originally Posted by dave View Post
    Hi Guys,

    I'm again out of these. Thought I might as well do a group buy if anyone is interested and pass on some savings.

    Another group buy for the same lenses as per last time?

    Lens sizes are as follows:

    Convex lens - 12mm high by 10mm wide
    concave lens - 12mm high by 6mm wide

    Mag ratio: 4x magnification or 6x magnification

    Material:BK7
    Surface Quality:60-40
    Coating:AR A:350-650nm

    Per set if we get to 50 sets, they will work out at $40AUD inc PP and airmail shipping costs

    Add name qty below
    leading in trailing technology

  3. #3
    Join Date
    Jan 2017
    Posts
    2

    Default

    one for me, got pm ;-)

  4. #4
    Join Date
    Nov 2005
    Location
    Melbourne, Australia
    Posts
    3,694

    Default

    Quote Originally Posted by polishedball View Post
    Any chance mounts will be an option to add?
    Yeah sure, I still have plenty - $10AUD per pair

    - - - Updated - - -

    List to track numbers - add to this:

    David - 10 sets - 6x
    Noty - 1 set - 6x
    KVANT Australian projector sales
    https://www.facebook.com/kvantaus/

    Lasershowparts- Laser Parts at great prices
    https://www.facebook.com/lasershowparts/

  5. #5
    Join Date
    Jan 2013
    Location
    Kenilworth, UK
    Posts
    44

    Default

    Dave, have sent you PM, also need some other bits as well as *4 and *6, can you confirm you have seen it?

    Thanks,

    Dupe...

  6. #6
    Join Date
    Jun 2010
    Location
    Youngstown OH temporary
    Posts
    135

    Default

    3 sets for me please.6X

  7. #7
    Join Date
    Feb 2007
    Location
    Fort Mill, SC USA
    Posts
    1,418

    Default

    Hey Dave!

    Sign me up for 2 of the 4x and 1 of the 6x (with mounts for all), please!

    -David
    "Help, help, I'm being repressed!"

  8. #8
    Join Date
    Jun 2010
    Location
    Syracuse, NY
    Posts
    287

    Default

    I'm interested in a set but have two questions. I have a set that I bought years ago but I don't remember the focal length. Is it crucial that both beams are corrected with the same focal length cylinders or can they be combined without issue using two different focal length sets? Also, I'm still unsure as to what effect different focal lengths have on the beams. I will be combining 2 P73 diodes. Is one particular set more appropriate than the other? Considering I have a 50/50 chance of matching the focal length of my current set, which set would be recommended? I guess that's more than 2 questions but you get the idea. Thanks for the help.


    Luke
    LASERS!!

    1x Homemade 500mW 405nm Projector
    1x Homemade 1.2W RGB Projector
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    ZPL Lighting www.zpllighting.com

  9. #9
    Join Date
    May 2014
    Location
    Barcelona, Spain
    Posts
    437

    Default

    You have to deal with 3 variables: FL Collimator, cyl magnification, and cyl distance from diode. You can get almost the same results (beam specs) with any combination, but the necessary room to achieve it can vary.
    For a given FL collimator, you can get the same expansion with 4x cyl set or 6x cyl set, but you need to place the 4x cyl set far away from diode vs 6x to get the same expansion. So further away cyl set from diode=more expansion (fatter beam, less divergence).
    So you can play moving away cyl set from diode until getting desired expansion ie beam specs.
    That said... if you go with 2mm FL colli, you can place the cyl set closer to diode to get the same expansion than going with G2 (longer FL), because with f2 the beam is more divergent so magnification is higher on the cyls.
    If going with G2 and 4x cyls, you should place the cyls very far away from diode to get say...5mm beam about 1mrad...so better 6x cyls with G2...it requires less room.
    But again...it depends on the beam specs you want to achieve, based on your aperture scan and green/blue specs. To get near 5mm beam/1mrad with less required room: G2+6x cyl set or F2+4x cyl set. Combine with PBS before cyls. With F2 because of smaller near field beam profile, you can even stack both vertically (4mm heigh) and avoid PBS/Rotator.


    Quote Originally Posted by ZeroPoint View Post
    I'm interested in a set but have two questions. I have a set that I bought years ago but I don't remember the focal length. Is it crucial that both beams are corrected with the same focal length cylinders or can they be combined without issue using two different focal length sets? Also, I'm still unsure as to what effect different focal lengths have on the beams. I will be combining 2 P73 diodes. Is one particular set more appropriate than the other? Considering I have a 50/50 chance of matching the focal length of my current set, which set would be recommended? I guess that's more than 2 questions but you get the idea. Thanks for the help.

    Luke
    Last edited by jors; 02-06-2017 at 07:39.

  10. #10
    Join Date
    Jun 2010
    Location
    Syracuse, NY
    Posts
    287

    Default

    Ok, put me down for one 6x set with mount pair. Thanks!

    Luke

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