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Range Finding

Discussion in 'Other Chatter' started by jdlenton, Jul 11, 2006.

  1. jdlenton

    jdlenton Full Member

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    Over the weekend some of us were lucky enough to spend a few day paddling on the Thames thanks Rich
    During our trip one of the things that came up was judging distance and how accurate some people were and thought they were!

    i got to thinking could you buy a small device that was robust didn't need batteries and that you could sight through and get a distance reading? this lead onto me thinking could you fashion something when out and about that could help you judge distance?
    now I've seen fairly complex mechanical range finders for gunners on ships but i want a better bushcraft version something maybe a middle ages sailor would have had
    Having had a bit of a Google around and not found much here's the question.

    Has any body got any ideas designs about non electronic basic hand held simple range finders
    in the historical record or that can be bought or that could be made by hand out of materials that could be readily found or recycled in the great outdoors?

    James
     
  2. Buckshot

    Buckshot Mod
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    I missed that conversation James - what was it about?

    The only things I'm aware of are electronic devices.
    I assume you're thinking of something you can use so you don't have to move from the spot where you're standing?

    Mark
     
  3. leon-1

    leon-1 Mod
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    Yes, carry a stick with notches on it, the notches reperesent the relevant height of specific items at a specific range.

    For instance hold the stick out a arms length, check the notch for the height of an average person / fence post / telegraph pole at a hundred meters. the smaller the height the longer the range, in the forces you use graticule patterns in sites and binoculars to do the same thing.

    For instance a graticule that has the height of 20 mils will be the same height as a person who is 2 meters tall in height at 100 meters.
     
  4. ArkAngel

    ArkAngel Native

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    i doubt if you could make one yourself but my rifle scope has a resonably accurate rangefinder on it. A focus dial on the front with pre set markings, when the items in focus read off the range.

    I wonder if a small monocular could be adapted to do the same?
     
  5. leon-1

    leon-1 Mod
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    That's Parallax IIRC.:)

    I tend to find being able to relate the size of an object in the distance to the size of a given object up close works pretty well and it is a lot easier than working with lenses in the long run.
     
  6. Cormac

    Cormac Tenderfoot

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    you can got monoculars for golf would they work
     
  7. Eric_Methven

    Eric_Methven Bushcrafter (boy, I've got a lot to say!)

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    If you have a map and compass (and you should have if you are outdoors) you can take triangulation bearings to find range quite easily. All you need are two identifiable features you can see on a map.

    Eric
     
  8. Ahjno

    Ahjno Vice-Adminral
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    Unless you are only familiar with churches being big tall buildings ... :rolleyes: Than you can be about a 1000 meters off :eek: ... Taken that into account, our distance judgement is pretty good, isn't it? :approve: :D
     
  9. moduser

    moduser Full Member

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    Hi James,

    Before the advent of laser rangefinders, archers used a mechanical type similar to this
    http://cgi.ebay.co.uk/COLEMAN-RANGE...305QQihZ004QQcategoryZ383QQrdZ1QQcmdZViewItem

    Quicks Archery used to sell them but I can't find it on the web site.

    Another alterative which like Leon's idea of knowing the size of a object is the new range of rifle sights have reticules which allow quite accurat range finding.

    A good example is the Hawk Air Max SR

    http://www.hawkeoptics.com/specialized_reticles/AirmaxSR/index.htm

    Moduser
     
  10. Stuart

    Stuart Full Member

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    Use your thumb

    [​IMG]


    http://www-spof.gsfc.nasa.gov/stargaze/Sparalax.htm

    http://www.vendian.org/mncharity/dir3/bodyruler_angle/
     
  11. Stuart

    Stuart Full Member

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  12. jdlenton

    jdlenton Full Member

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    It was toward the end of the first day when there was some debate on how far we'd traveled in the boats and Jed started to test myself and roving rich on our distance estimating skills

    thats a nice simple idea we'll have to have a play at the moot

    I can already do this quite accurately and you are quite right but i fancy a simple sighting device that can accompany my navigation equipment for quick simple sight estimating of distance.

    Dave any chance of a picture of one of these sounds really interesting but evilbay is blocked here at school

    Stuart as usual mate you've produced the goods how did i know you would have some good contributions

    James
     
  13. moduser

    moduser Full Member

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    James,

    here are some examples that I found in the vintage photography section of ebay, very similar to what I used to use.

    Example1
    Example2
    Example3

    Rgds

    David
     
  14. jdlenton

    jdlenton Full Member

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    thanks Dave now thats a nice piece of kit i wonder what they cost


    James
     
  15. moduser

    moduser Full Member

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    James,

    Via ebay you are probably only looking at a few pounds if your prepared to bide your time.

    For example the Watameter one (example3) is currently running at £2.60 with 4.5hrs left to run.

    David
     
  16. mark a.

    mark a. Settler

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    I was thinking about camera rangefinders. I have an old Fed camera which cost a whole £10 from ebay, so could be used for calculating distance. Just adjust the lens until the 2 images line up on whatever object you're looking at, then read the distance off the lens scale.

    The only problem with that is that it'll only be accurate for short distances. Anything beyond a certain distance (not sure, but maybe something like 20 metres) would just be essentially "infinity" according to the camera. So it will be unhelpful for long distances, which I'm guessing is what you'd actually want it for.
     
  17. nitram55

    nitram55 Forager

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