Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers

How to Register on LPF | LPF Donations

Can't Focus My Blu-Ray

Spyderz20x6

Spyderz20x6

0
Joined
Nov 24, 2007
Messages
2,735
Points
0
I was playing around with my Blu-Ray at night, and noticed the dot looks blurry from around 30 feet. At first, i thought it was my eyes, but i decided to do a little test...

I put the on a piece of wood, and walked 30 feet where the beam is stopped by a big container thing. Low and behold, the dot is the size of 2 baseballs!! :o :o

I thought it was focused to infinity, because from around 18 feet, the dot is tiny! The little ring grip focusing thing is on the aixiz, so it might be because some of the space on the threads is taken up. How do i know when it is to infinity?
 





I've found the aixiz acrylics need to be screwed in a little further than the focusing ring will allow.. try removing the ring and focusing it a little tighter.

I find the easiest way to test for culmination is to set up a mirror as far away as possible, then your dot will end up near where the laser is, so you can adjust it while being able to see the dot up close.
 
pseudolobster said:
I've found the aixiz acrylics need to be screwed in a little further than the focusing ring will allow.. try removing the ring and focusing it a little tighter.

I find the easiest way to test for culmination is to set up a mirror as far away as possible, then your dot will end up near where the laser is, so you can adjust it while being able to see the dot up close.
Click to expand...
Thanks for the tip :)
 
I confirm that my blue ray dot at 750 m is equal to a circle of 2m, i will try to focus more using aixiz or DX monocular. Nice tip with mirror ! =)
 
pseudolobster said:
I find the easiest way to test for culmination is to set up a mirror as far away as possible, then your dot will end up near where the laser is, so you can adjust it while being able to see the dot up close.
Click to expand...

That's exactly what I am doing when focusing my red and blu-ray lasers to infinity for long range pointing. It's much easier than estimating the dot size on a surface 50m away. Just screw the lens until you will see a small dot beside, it's very easy actually. :)
 
TheGr8Revealing said:
405nm beams have a lot of divergence as well, and even more so with acrylic lenses...
Click to expand...
My understanding is that 405nm has a better possible divergence then say red or green. :-?
 
styropyro said:
[quote author=TheGr8Revealing link=1217210573/0#5 date=1217348051]405nm beams have a lot of divergence as well, and even more so with acrylic lenses...
Click to expand...
My understanding is that 405nm has a better possible divergence then say red or green. :-?[/quote]
Lol, i was just about to tell him that...
 
whooops. i thought for sure it was the opposite.... i get way more "baseball bat" effect with my blu-rays than i do with my reds or greenies...
 
TheGr8Revealing said:
whooops. i thought for sure it was the opposite.... i get way more "baseball bat" effect with my blu-rays than i do with my reds or greenies...
Click to expand...
It's because the BR diode has to be deeper in the AixiZ module...
 
TheGr8Revealing said:
[quote author=Spyderz20x6 link=1217210573/0#9 date=1217446154]
It's because the BR diode has to be deeper in the AixiZ module...
Click to expand...

nah its in there fully, i can focus it to infinity just fine... [/quote]
Oh, ok...
 
For those with lathes, it's easy to just machine the back of the the focus ring, so that it is a little thinner (allowing more room to screw the lens down). I have been doing this with 803T/AixiZ builds. Of course, without a lathe, it wouldn't look clean...
Jay
 
jayrob said:
For those with lathes, it's easy to just machine the back of the the focus ring, so that it is a little thinner (allowing more room to screw the lens down). I have been doing this with 803T/AixiZ builds. Of course, without a lathe, it wouldn't look clean...
Jay
Click to expand...
Problem is... I don't have a lathe :'(
 
Spyderz20x6 said:
[quote author=jayrob link=1217210573/0#12 date=1217570826]For those with lathes, it's easy to just machine the back of the the focus ring, so that it is a little thinner (allowing more room to screw the lens down). I have been doing this with 803T/AixiZ builds. Of course, without a lathe, it wouldn't look clean...
Jay
Click to expand...
Problem is... I don't have a lathe :'([/quote]

You can do this by hand. It just takes longer and can tire you out ;)

Just take the ring off and "rub" it on a piece of 100grit sandpaper you have placed on a flat surface. I recommend you wear a glove when you do this.

OR you can just leave the focus ring off. I just focus the lens using one fingernail in the groove in the lens nut.

Peace,
dave
 
daguin said:
[quote author=Spyderz20x6 link=1217210573/0#13 date=1217614078][quote author=jayrob link=1217210573/0#12 date=1217570826]For those with lathes, it's easy to just machine the back of the the focus ring, so that it is a little thinner (allowing more room to screw the lens down). I have been doing this with 803T/AixiZ builds. Of course, without a lathe, it wouldn't look clean...
Jay
Click to expand...
Problem is... I don't have a lathe :'([/quote]

You can do this by hand.  It just takes longer and can tire you out ;)

Just take the ring off and "rub" it on a piece of 100grit sandpaper you have placed on a flat surface.  I recommend you wear a glove when you do this.

OR you can just leave the focus ring off.  I just focus the lens using one fingernail in the groove in the lens nut.

Peace,
dave[/quote]
I'll try the sandpaper part ;)
What about the Sure Electronics focusing ring?
 
You must log in or register to reply here.


Back
Top