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Old January 10th 06, 12:46 PM posted to uk.d-i-y
Chris Bacon
 
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Default DIY Laser Level

Phil wrote:
Quite right, the light beam will sag over that sort of distance....


Phil - WTF are you on about? Please learn to quote correctly.
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Old January 10th 06, 12:50 PM posted to uk.d-i-y
Ian Stirling
 
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Default DIY Laser Level

Kev wrote:

david lang wrote:
Kev wrote:
Just wondering over what sort of distance one of the diy laser levels
will work? I need to check a level over a couple of hundred feet and
suspect that it wouldn't be powerful enough but assume that I could do
it in stages by laying out some sort of peg system.


Mine will send the little red dot a hundred feet easily if used after dusk.
Don't know how accurate it would be though.


It doesn't have to be hugely accurate so it might do the job.


It won't send a little red dot a hundred feet.
The cheaper units typically have a divergance of around half a
milliradian. For less divergance, you need to be able to focus onto an
objective, and have a bigger lens.
The cheaper ones will do a spot of maybe 5cm at 100m, and this is
trivial to see at dusk.

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Old January 10th 06, 01:07 PM posted to uk.d-i-y
david lang
 
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Ian Stirling wrote:

It won't send a little red dot a hundred feet.
The cheaper units typically have a divergance of around half a
milliradian. For less divergance, you need to be able to focus onto an
objective, and have a bigger lens.
The cheaper ones will do a spot of maybe 5cm at 100m, and this is
trivial to see at dusk.


Mine will shine a red dot onto the chimney of a house at the end of the cul
de sac, well over 100 ft away. Granted I don't know how big the dot is, but
it certainly reaches that distance.

Dave


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Old January 10th 06, 01:50 PM posted to uk.d-i-y
Ian Stirling
 
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Default DIY Laser Level

david lang wrote:
Ian Stirling wrote:

It won't send a little red dot a hundred feet.
The cheaper units typically have a divergance of around half a
milliradian. For less divergance, you need to be able to focus onto an
objective, and have a bigger lens.
The cheaper ones will do a spot of maybe 5cm at 100m, and this is
trivial to see at dusk.


Mine will shine a red dot onto the chimney of a house at the end of the cul
de sac, well over 100 ft away. Granted I don't know how big the dot is, but
it certainly reaches that distance.


True - but the dot it sends is not little.
At 100 feet, you're looking at 2-3cm or so.

If you're next to the dot at night, you can probably see it perfectly
well until the dot gets to well over a meter.

And then - looking towards the laser, it's visible when the spot is many
tens of meters wide.


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Old January 10th 06, 04:01 PM posted to uk.d-i-y
Andy Dingley
 
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Default DIY Laser Level

On 10 Jan 2006 02:07:39 -0800, "Kev" wrote:

Just wondering over what sort of distance one of the diy laser levels
will work?


Miles and miles if you can work after dark. The spot is small enough,
it's just seeing it.

Otherwise it's still easier to use a telescope to look at a mark in
daylight.
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Old January 10th 06, 04:50 PM posted to uk.d-i-y
Ian Stirling
 
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Default DIY Laser Level

Ian Stirling wrote:
david lang wrote:
Ian Stirling wrote:

It won't send a little red dot a hundred feet.
The cheaper units typically have a divergance of around half a
milliradian. For less divergance, you need to be able to focus onto an
objective, and have a bigger lens.
The cheaper ones will do a spot of maybe 5cm at 100m, and this is
trivial to see at dusk.


Mine will shine a red dot onto the chimney of a house at the end of the cul
de sac, well over 100 ft away. Granted I don't know how big the dot is, but
it certainly reaches that distance.


True - but the dot it sends is not little.
At 100 feet, you're looking at 2-3cm or so.

If you're next to the dot at night, you can probably see it perfectly
well until the dot gets to well over a meter.

And then - looking towards the laser, it's visible when the spot is many
tens of meters wide.


I should have mentioned - that I've also used a laser pointer, a bit of
15mm pipe insulation to grab it, and a bit of waste pipe, to slip a
laser pointer into accurate alignment with a pair of binoculars.
The binoculars then form a beam expander, and greatly reduce the
divergance.


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