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Old 07-28-2008, 02:02 AM #1
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Default Can't Focus My Blu-Ray

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!!

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?


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Old 07-28-2008, 02:06 AM #2
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Default Re: Can't Focus My Blu-Ray

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.
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Old 07-28-2008, 02:22 AM #3
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Default Re: Can't Focus My Blu-Ray

Quote:
Originally Posted by pseudolobster
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.
Thanks for the tip

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Old 07-28-2008, 09:21 AM #4
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Default Re: Can't Focus My Blu-Ray

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 ! =)
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Old 07-28-2008, 10:28 AM #5
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Default Re: Can't Focus My Blu-Ray

Quote:
Originally Posted by pseudolobster
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.
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.


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Old 07-29-2008, 04:14 PM #6
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Default Re: Can't Focus My Blu-Ray

405nm beams have a lot of divergence as well, and even more so with acrylic lenses...
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Old 07-29-2008, 09:37 PM #7
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Default Re: Can't Focus My Blu-Ray

Quote:
Originally Posted by TheGr8Revealing
405nm beams have a lot of divergence as well, and even more so with acrylic lenses...
My understanding is that 405nm has a better possible divergence then say red or green. :-?
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Old 07-30-2008, 02:54 AM #8
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Default Re: Can't Focus My Blu-Ray

Quote:
Originally Posted by styropyro
[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...
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...
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Old 07-30-2008, 06:51 PM #9
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Default Re: Can't Focus My Blu-Ray

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...
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Old 07-30-2008, 07:29 PM #10
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Default Re: Can't Focus My Blu-Ray

Quote:
Originally Posted by TheGr8Revealing
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...
It's because the BR diode has to be deeper in the AixiZ module...
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Old 07-30-2008, 09:11 PM #11
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Default Re: Can't Focus My Blu-Ray

Quote:
Originally Posted by Spyderz20x6
It's because the BR diode has to be deeper in the AixiZ module...
nah its in there fully, i can focus it to infinity just fine...
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Old 07-31-2008, 02:06 AM #12
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Default Re: Can't Focus My Blu-Ray

Quote:
Originally Posted by TheGr8Revealing
[quote author=Spyderz20x6 link=1217210573/0#9 date=1217446154]
It's because the BR diode has to be deeper in the AixiZ module...
nah its in there fully, i can focus it to infinity just fine... [/quote]
Oh, ok...
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Old 08-01-2008, 06:07 AM #13
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Default Re: Can't Focus My Blu-Ray

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...
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Old 08-01-2008, 06:07 PM #14
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Default Re: Can't Focus My Blu-Ray

Quote:
Originally Posted by jayrob
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...
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Problem is... I don't have a lathe :'(
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Old 08-01-2008, 06:17 PM #15
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Default Re: Can't Focus My Blu-Ray

Quote:
Originally Posted by Spyderz20x6
[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
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
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Old 08-01-2008, 08:02 PM #16
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Default Re: Can't Focus My Blu-Ray

Quote:
Originally Posted by daguin
[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
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?
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