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Article #110

Re: Question: Curious Laser Beam

#110
From: Jim Hahn
Date: Fri, 16 Aug 1996 00:00
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>On Wed, 14 Aug 1996 02:03:58 GMT, UZSD78@IBM.RHRZ.Uni-Bonn.DE
>(Thorsten Franz) wrote:

>>when I was sitting in my living room tonight, a spot of red light (at
>>most one inch in diameter) appeared on the wall and wandered over it,
>>coming to rest on the back of the head of my girlfriend. I wasn't able
>>to determine the exact size because it was obviously steered by a
>>shaking hand.
>>
>>I thought it might have to do with a construction site across the
>>street and went downstairs to check, but found noone. From down there
>>it was clear that the angle wasn't right anyway and that the beam must
>>have come from one of the dark windows in a nearby administration
>>building, probably 5th or 6th floor.
>>
>>A laser pointer, as used for presentations on blackboards, would have
>>been too unprecise over the estimated distance of 100 meters.

	--snip--

Although this is probably a joke post, I'll bite...

A good rifleman would not use a laser pointing device on his rifle.  a) He 
has to see the image BACK at the rifle and that's going to be tough at 
any big distance.  b) He will instead use a scope for a precise hit.  Both
a scope and a laser will require one to know the distance so as to compute
bullet drop and trajectory.  Laser devices are useful (only) for "point and
shoot" very quick target acquisition situations, usually at distances of
tens of feet, and they are useful for intimidation.

So, anyway, a NRA High Master rifle shooter will have (as all shooters have)
a wobble zone.  His might be one MOA from one side to the other.  At
600 yards, that's 6 inches which is the diameter of the X ring.  He has
to contend with wind drift deltas, but the laser beam won't.  (Of course,
the bullet fired from the laser beam sighted rifle WILL.)  The original poster
said the spot was one inch wide.  Was that the diameter of the spot at
any one instant of time, or did it include the wobble of the shaky hand?
  --jim
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From: hahn@scd.teradyne.com (Jim Hahn)
Subject: Re: Question: Curious Laser Beam
Date: 1996/08/16
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