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Thread: Light sources for focusing in low light

  1. #1

    Join Date
    Apr 2002
    Location
    Sydney, Australia
    Posts
    127

    Light sources for focusing in low light

    I found this 4 year old thread in the archives. It speculated about the use of lasers (and other light sources) for focusing in low light.

    I often face this challenge in situations where I can't walk out and place a torch to focus on, so I need to be able to shine a focus-capable beam of light up to (say) 10 meters. Has anyone proved the conjecture in that thread or pioneered an alternative approach?

    Thanks.
    Leigh Perry
    www.leighperry.com

  2. #2

    Join Date
    Sep 2003
    Location
    Harbor City, California
    Posts
    1,748

    Light sources for focusing in low light

    Awhile back I suggested the use of one of the rechargeable high candlepower (mine claims 500.000 c.p.) lights that are common and cheap here in the United States. (I just now tried to find this thread, but wasn't successful.) Several people commented that they used laser pointers which are much smaller and lighter. They expressed satisfaction in their use. I think both light sources may have their usefulness.

  3. #3

    Join Date
    Sep 2003
    Location
    No. Virginia
    Posts
    363

    Light sources for focusing in low light

    Try your local police uniform store. They are making flashlights now that use 2 c-cells with xenon bulbs that will burn out your retina at 30 meters.

    Or get a Crown Graphic with a top rangefinder and push the little red button. It will focus on a cave wall at midnight.

  4. #4

    Join Date
    Mar 2004
    Location
    San Francisco
    Posts
    625

    Light sources for focusing in low light

    I bought a cheapo laser pointer specifically for that purpose, and threw it away because it wasn't bright enough at a range of maybe 20 feet. Just a word of warning.

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