Results 1 to 9 of 9

Thread: Quick Lens question

  1. #1

    Quick Lens question

    The smaller the focal length, the smaller the dot size, correct? (or do I have that backwards)
    Shenhui G460 80W RECI
    LIAOCHENG RAY FINE RF-6040-90W RECI
    Corel X5 Technical Suite, Windows 7

  2. #2
    You have it right.
    Lasers : Trotec Speedy 300 75W, Trotec Speedy 300 80W, Galvo Fiber Laser 20W
    Printers : Mimaki UJF-6042 UV Flatbed Printer , HP Designjet L26500 61" Wide Format Latex Printer, Summa S140-T 48" Vinyl Plotter
    Router : ShopBot 48" x 96" CNC Router Rotary Engravers : (2) Xenetech XOT 16 x 25 Rotary Engravers

    Real name Steve but that name was taken on the forum. Used Middle name. Call me Steve or Scott, doesn't matter.

  3. #3
    Thanks Scott!
    Shenhui G460 80W RECI
    LIAOCHENG RAY FINE RF-6040-90W RECI
    Corel X5 Technical Suite, Windows 7

  4. #4
    Join Date
    Nov 2007
    Location
    Glenelg, MD
    Posts
    12,256
    Blog Entries
    1
    Quote Originally Posted by Walt Langhans View Post
    The smaller the focal length, the smaller the dot size, correct? (or do I have that backwards)
    I'll also add to that list... the shorter the working height/depth.
    Hi-Tec Designs, LLC -- Owner (and self-proclaimed LED guru )

    Trotec 80W Speedy 300 laser w/everything
    CAMaster Stinger CNC (25" x 36" x 5")
    USCutter 24" LaserPoint Vinyl Cutter
    Jet JWBS-18QT-3 18", 3HP bandsaw
    Robust Beauty 25"x52" wood lathe w/everything
    Jet BD-920W 9"x20" metal lathe
    Delta 18-900L 18" drill press

    Flame Polisher (ooooh, FIRE!)
    Freeware: InkScape, Paint.NET, DoubleCAD XT
    Paidware: Wacom Intuos4 (Large), CorelDRAW X5

  5. #5
    Join Date
    Oct 2007
    Location
    Cincinnati, Ohio
    Posts
    1,843
    Quote Originally Posted by Dan Hintz View Post
    I'll also add to that list... the shorter the working height/depth.

    Adding to that.... The less focal length you have to work in. For example, my 2.0, I can usually be 1/16th (over 1/8th on some materials) or so in or out and still get a good shot. However my 1.5 has to be focused spot on.
    Tim
    There are Big Brain people & Small Brain people. I'm one of the Big Brains - with a lot of empty space.- me
    50W Fiber - Raycus/MaxPhotonics - It's a metal eating beast!
    Epilog Fusion M2 50/30 Co2/Fiber - 2015
    Epilog Mini 24 – 35watt - 2006 (Original Tube)
    Ricoh SG3110DN
    - Liberty Laser LLC

  6. #6
    I noticed on ebay the other day when buying more $18 lenses, you can get a ONE INCH focus lens-- I was going to get one just for giggles but I already have a 1.5" I've only tried once--
    ========================================
    ELEVEN - rotary cutter tool machines
    FOUR - CO2 lasers
    THREE- make that FOUR now - fiber lasers
    ONE - vinyl cutter
    CASmate, Corel, Gravostyle


  7. #7
    You can get 1/2" and 3/8" off the shelf too Kev
    You did what !

  8. #8
    I've been doing some acrylic work and I'm hoping that a smaller dot will get me a little better resolution. What I have isn't bad... but I would like better. Thanks for the replies guys!
    Shenhui G460 80W RECI
    LIAOCHENG RAY FINE RF-6040-90W RECI
    Corel X5 Technical Suite, Windows 7

  9. #9
    Join Date
    Dec 2009
    Location
    Vermont
    Posts
    1,484
    You'll get a smaller spot size, but might not be able to cut it.
    The depth of field is more shallow.

    I might try a 1" for making cliches though. No cutting involved.
    Avatar courtesy of the awesome Frank Corker
    30w Mercury and workbench so full of misc. tools that
    I can't find any of them. So I have to buy them again.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •