Has any one ever used one of these before, and is it worth purchasing one?
http://www.amazing1.com/laser.htm#hprl
/ubbthreads/images/graemlins/smile.gif
http://www.amazing1.com/laser.htm#hprl
/ubbthreads/images/graemlins/smile.gif
Laser Pointer Range Extender
- Thread starter DaFiend
- Start date
WildRice
Flashlight Enthusiast
plans and lenses for a collumating telescope. I used a variant of these on high power YAGs. -75mm then a +75mm, when in focus would make a $5 laser pen hit the far side of the plant I was in. A chepie telescope or binaculars(?) work well also.
Jeff
I got some stuff from there years ago and wasn't impressed with the quality. $20 for a set of lenses probably aint too bad as long as they are halfway decent glass. the PVC couplings are cheap enough tho. I have some + and -75mm lenses lying around here somewhere. I will try some stuff and see if I can get some idea on spacing. if you dont need the 'plans' I am sure $20 can get some GOOD lenses.
Jeff
I got some stuff from there years ago and wasn't impressed with the quality. $20 for a set of lenses probably aint too bad as long as they are halfway decent glass. the PVC couplings are cheap enough tho. I have some + and -75mm lenses lying around here somewhere. I will try some stuff and see if I can get some idea on spacing. if you dont need the 'plans' I am sure $20 can get some GOOD lenses.
Here's what I did. I had some old pointer cases laying around, with a pipe or tube cutter I cut the caseing. I then when to a mom & pop electronics supply store and bought a alligator clip boot,cut this also, this is used to hold the cut case to the working pointer thus extending the pointers length. Next I did this. The first self made lens mount I used in the original pointer came from a plastic pen whose OD diameter [12mm] was just slightly smaller than the I.D. of the laser pointer. Some other things I used were an O-ring to fit aroung the lens holder, the purpose is to keep the lens mount in place during collimation and some 527 adhesive from a craft store. I did remove the original collimating lens and replaced it with a longer focal length PCX. Lenses can be bought from Edmund Industrial Optics. I used AR coated lenses.I now use a lens with a focal length of 48mm this gives a divergence of about .14mrd @ 10m. This means for every meter of travel the beam expands .014mm.
i just had a bit of a closer look, so what your saying, these don't come fully assembled, and it looks like you need to buy more parts.....? that sounds well, a little lazy. Unless of course you want to assemble your own i suppose, but i just don't have the time. /ubbthreads/images/graemlins/icon23.gif
Probably good for reds, but un-nessasary with a 38mW green right? or could it make it even better?
Probably good for reds, but un-nessasary with a 38mW green right? or could it make it even better?
Assuming you have a Leadlight pointer with a beam divergence of 1.2 mrd[ equals a beam diameter at apparture of .53cm] spot size will be approx. this at,
10m=1.1cm=.036 feet=.432in
100m=11cm=.36 feet=4.32in
1000m=110cm=3.6 feet
10000m=1100cm=36 feet
My pointer with a divergence of .14mrd and a beam diameter 4.5-5mm , spot size at, approx.
10m=.14mm=.0046 feet-.0552in
100m=1.41cm=.046 feet=.552in
1000m=14.18cm=.465 feet=5.58in
10000m=141.86cm= 4.65 feet
I believe the math is accurate.
As you see divergence makes a difference. Lower divergence keeps the light in a narrow path this equals a greater distance to which an object can be illuminated. So do you think it is worth it?
10m=1.1cm=.036 feet=.432in
100m=11cm=.36 feet=4.32in
1000m=110cm=3.6 feet
10000m=1100cm=36 feet
My pointer with a divergence of .14mrd and a beam diameter 4.5-5mm , spot size at, approx.
10m=.14mm=.0046 feet-.0552in
100m=1.41cm=.046 feet=.552in
1000m=14.18cm=.465 feet=5.58in
10000m=141.86cm= 4.65 feet
I believe the math is accurate.
As you see divergence makes a difference. Lower divergence keeps the light in a narrow path this equals a greater distance to which an object can be illuminated. So do you think it is worth it?
