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Motocrossboy69
25mW Classic Wicked Laser
Joined: 16 Jul 2008
Posts: 30
Location: surrey
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 Posted: 7/19/08, 2:49 PM Post subject: Concave le |
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Hi, was just wondering were I could find a concave lense without having to order or buy one? thanks  |
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tmaxx
Modified 10mW Greenie
Joined: 20 Jul 2008
Posts: 23
Location: mexico
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| Posted: 7/20/08, 2:17 PM Post subject: Re: Concav |
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| Motocrossboy69 wrote: |
| Hi, was just wondering were I could find a concave lense without having to order or buy one? thanks |
I have found a concave lens in portable cd players. Also you can get a cheap red laser for about 5 bucks all over the place and they have a concave lens in them that will probally fit right into your laser but there normaly plastic. Even though there plastic it will intensify the laser beam heat at its thinest point......normally at about 1 foot. After that first foot the beem will become huge. |
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Bluefan
Fusion Laser
Joined: 20 Apr 2008
Posts: 299
Movie(s): 1
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| Posted: 7/20/08, 2:58 PM Post subject: |
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aren't those convex lenses? Convex lenses have a positive focus length, and that are the ytpe of lenses in cd players. Concave lenses have a negative focus length.
[url]http://en.wikipedia.org/wiki/Lens_(optics)[/url] |
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tmaxx
Modified 10mW Greenie
Joined: 20 Jul 2008
Posts: 23
Location: mexico
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| Posted: 7/20/08, 3:07 PM Post subject: |
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| Sorry if I confused anyone. |
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Motocrossboy69
25mW Classic Wicked Laser
Joined: 16 Jul 2008
Posts: 30
Location: surrey
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| Posted: 7/20/08, 4:33 PM Post subject: |
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| its ok its just im trying to make a collimator from the projects section |
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