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Old 12-23-2008, 07:24 PM #1
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Default Would this be dust in the lens?

i don't quite know how this occurred but my blu-ray has recently acquired some fuzziness around its dot when projected onto a wall. If this is dust, what would be the fastest and easiest way to remove the dust "tut w. pics would help = D"

here are a few pics of what the dot looks like compared to before this happened.
and before you ask; yes all shots have the laser focused


before shots.....







after.....





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Old 12-23-2008, 08:09 PM #2
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Default Re: Would this be dust in the lens?

thats normal, just take a q tip wet one side, wipe, dry with other side
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Old 12-23-2008, 08:30 PM #3
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Default Re: Would this be dust in the lens?

alright will do = DD
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Old 12-23-2008, 08:38 PM #4
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Default Re: Would this be dust in the lens?

alright, worked. thanks a junk load 8-)
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Old 12-23-2008, 09:38 PM #5
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Default Re: Would this be dust in the lens?

wipe!!

never wipe a lens, wiping is how scratches occur
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Old 12-24-2008, 01:21 AM #6
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Default Re: Would this be dust in the lens?

well i put it onto the lens with the q-tip and spun a circle
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Old 12-24-2008, 07:16 AM #7
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Default Re: Would this be dust in the lens?

anything that involves touching the lens can causing scratching.

if possible i would avoid
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Old 12-29-2008, 06:09 PM #8
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Default Re: Would this be dust in the lens?

This is what compressed air cannisters are for.

You can get them at any hardware store, just make sure they contain "dry air" or "inert gas."

Spray the inside of the lens with a few short blasts while holding it so the side you're spraying faces down; have the laser pointing down, too, if you can. Then mount the lens quickly, and spray the outside of it with a few short blasts. Make sure you don't touch it at any point, and wear disposable, sterile gloves if you can.

If you ever run into specks that still don't go away, try rotating the lens slightly while the laser is on (be careful not to get the beam into your eyes!). If the specks rotate as the lens does, then you need to clean the lens again. If the specks stay still, then it's the window on the laser diode that is dirty. To clean the diode window, make sure the compressed air isn't too high pressure, and hope it will work. Often, when you find specks on the window itself, they have already been burned onto it by the time you spot them, in which case I'd simply replace the diode.

The only thing more annoying than dust would be bacteria, pollen and spores ...

... unless you like watching the diffraction patterns changing during mitosis, of course.
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Old 12-29-2008, 06:23 PM #9
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Default Re: Would this be dust in the lens?

haha, nice = D the problem seems to be fixed now but i will remember this for future reference
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Old 01-21-2009, 08:34 PM #10
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Default Re: Would this be dust in the lens?

If the lens have scratches how it can be fixed now?
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Old 02-03-2011, 11:51 PM #11
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Exclamation Re: Would this be dust in the lens?

Quote:
Originally Posted by suiraM View Post
This is what compressed air cannisters are for.

You can get them at any hardware store, just make sure they contain "dry air" or "inert gas."

Spray the inside of the lens with a few short blasts while holding it so the side you're spraying faces down; have the laser pointing down, too, if you can. Then mount the lens quickly, and spray the outside of it with a few short blasts. Make sure you don't touch it at any point, and wear disposable, sterile gloves if you can.

If you ever run into specks that still don't go away, try rotating the lens slightly while the laser is on (be careful not to get the beam into your eyes!). If the specks rotate as the lens does, then you need to clean the lens again. If the specks stay still, then it's the window on the laser diode that is dirty. To clean the diode window, make sure the compressed air isn't too high pressure, and hope it will work. Often, when you find specks on the window itself, they have already been burned onto it by the time you spot them, in which case I'd simply replace the diode.

The only thing more annoying than dust would be bacteria, pollen and spores ...

... unless you like watching the diffraction patterns changing during mitosis, of course.
My lens is infested with bacteria.. when i unfocus the lens they become very obvious and i cant remove them.. I tried everything but they wont come off..
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Old 02-04-2011, 09:19 PM #12
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Default Re: Would this be dust in the lens?

Bacteria on your lens? Unless you've put your laser in your food that's not very likely. You can clean optics using lens paper and dry acetone or isopropanol, it really has to be dry or it will leave a residue when it evaporates. I'd be carefull with compressed air, it may be pretty dirty air for use in optics.
Dust doesn't burn that fast on a lens, lenses and coatings are pretty resistant, and only at high powers this is important, not many blu-ray's can deliver that much power. But when a lens or coating is scratched it's best to replace it, polishing it isn't worth it.
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