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Physics/optics experts - laser engraver lens with long focal length ?

  • 30-06-2020 8:10pm
    #1
    TuringBot47
    Registered Users Posts: 991 ✭✭✭


    Hi all,

    I bought a cheap 1000mw laser head here

    https://www.dx.com/p/adjustable-focal-laser-wood-kits-for-neje-dk-8-kz-bronze-2074700.html

    When a user review said you could just plug it into a usb power supply/battery and burn stuff. Cool, and a nice upgrade to boyhood burning stuff with a magnifying glass.

    It works. I plugged it into a usb battery pack and can point it to scorch small pieces of wood etc.

    Now I got laser safety goggles too after reading warnings.
    https://www.banggood.com/Laser-Protective-Goggles-Glasses-405nm-445nm-650nm-Red-Blue-Blue-violet-Laser-Eye-Protection-Safety-p-1396499.html?cur_warehouse=CN

    The problem is that it will only focus and burn within a couple of inches of the lens, after precisely focusing the lens to the target length/focal length.

    I've 200mw laser pointers that by design focus to infinity/long range.
    At 200mw you can practically see them in daytime, and this is 1000mw.

    Any optics/physics heads here know if you can get replacement lens that would focus to infinity ?

    I believe the lens size is M9 P0.5.

    Ideally, I'd like to point it down the garden and burn things... maybe mount it to a pan and tilt camera etc... nerdy playstuff.

    Any ideas?
    Or is a laser engraver lens inherently by design unable to focus to infinity/long range ? Or like a camera, would you have to auto-focus it precisely at different lengths ?

    cheers,
    t


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