LPF Donation via Stripe | LPF Donation - Other Methods
Links below open in new window
ArcticMyst Security by Avery
Wth, contradictory lens data
- Thread starter GMH
- Start date
AJ_Dual
0
- Joined
- Aug 10, 2007
- Messages
- 526
- Points
- 0
There's been a ton of mixups. Aixiz got a mis-labled shipment from their supplier, and to make it worse, they were on vacation and packaging/fulfilment employees shipped out a bunch more.
Although the blame lies more with China. Unless they exhaustively tested the lenses against 660 and then 405/445nm diodes and tested the outputs, how would they know?
Contact them, and they've been making it right for everyone. I don't think they even want your incorrect 660nm/red lens back.
Also, it seems to me that the plastic lens works so well (before it burns anyway) because many plastics have a different index of refraction than glass and that plastic lens can do "more with less" in terms of thickness, or width etc.
If you go to an optometrists shop in the mall etc. they often have a stand comparing regular glass, polycarbonate/acrylic lenses, and the premium "super lens" and you can see how thick each needs to be to achieve a certain Rx.
Although the blame lies more with China. Unless they exhaustively tested the lenses against 660 and then 405/445nm diodes and tested the outputs, how would they know?
Contact them, and they've been making it right for everyone. I don't think they even want your incorrect 660nm/red lens back.
Also, it seems to me that the plastic lens works so well (before it burns anyway) because many plastics have a different index of refraction than glass and that plastic lens can do "more with less" in terms of thickness, or width etc.
If you go to an optometrists shop in the mall etc. they often have a stand comparing regular glass, polycarbonate/acrylic lenses, and the premium "super lens" and you can see how thick each needs to be to achieve a certain Rx.
AJ_Dual
0
- Joined
- Aug 10, 2007
- Messages
- 526
- Points
- 0
You'd have to ask one of the people doing the group buy's who's actually disassembled a Casio projector.
However, I would guess that they are coated to reduce internal reflections and artifacts in the projection. It's just that no one uses the 13/140 lenses because individually they're useless for pointers/portables/lab type lasers where you want a single narrow beam. The focal length is set to hit the DLP or color wheel in the projector instead.
- Joined
- Jul 4, 2008
- Messages
- 2,036
- Points
- 48
Yeah, I want to know how the proper coating compares. Could you do a total re-test for consistent results, please? I know it's a pain, but temperature effects these diodes a bunch.
- Joined
- Dec 23, 2007
- Messages
- 2,494
- Points
- 0
I don't believe the Casio lenses are coated, I'll tell you for sure when I get home.
- Joined
- Jul 4, 2008
- Messages
- 2,036
- Points
- 48
pontiac-the casio lens reflects green. I'm not sure what that means.
- Joined
- Jan 11, 2008
- Messages
- 671
- Points
- 0
I was talking with a couple people about AR coatings and here is what they said (paraphrased).
Just because the lens reflects purple does not mean it's coated to only pass red light. Our eyes perceive both short wavelengths and some longer wavelengths as purple.
Just because the lens reflects purple does not mean it's coated to only pass red light. Our eyes perceive both short wavelengths and some longer wavelengths as purple.
Sure. I was gonna do that anyway when the replacement lens arrives. I'll do a full re-test wit all of them.
I might also do it for a 660 diode. I wanna see if these bad lens' work for 660nm at least.
- Joined
- Dec 23, 2007
- Messages
- 2,494
- Points
- 0
The casio lens is not coated from what I can see
- Joined
- Jul 4, 2008
- Messages
- 2,036
- Points
- 48
It's not purple, it's blue. It's very easy to tell if it's a yellow or blue coating.
If someone was looking for 10 to 20 unmounted lenses to use in a single lab laser which need as similar a dia. and F.L. as possible is there a review or source of the options available. As I read it there are acrylic vs. glass as well as single and multiple lens options. The discussions about these coatings suggest that some suppliers are providing lenses with mixed coatings on multiple elements, sometimes missing coatings. If we are not looking for every last mw, but want a good, consistent lens what to do? Won't the stock 130/140 lens collimate the beam as well as these aftermarket lenses if spaced optimally?
- Joined
- Dec 23, 2007
- Messages
- 2,494
- Points
- 0
The stock lens has "wings," it makes the dot look really nasty.
And no, there is no steady source of the same lenses except for the G1, but AFAIK it uses a hollowed out aixiz lens nut so it makes it difficult if you are machining a heatsink with threads for the lens because they are incredibly inconsistent. Not to mention it is incredibly expensive for a lens.
And no, there is no steady source of the same lenses except for the G1, but AFAIK it uses a hollowed out aixiz lens nut so it makes it difficult if you are machining a heatsink with threads for the lens because they are incredibly inconsistent. Not to mention it is incredibly expensive for a lens.
daguin
0
- Joined
- Mar 29, 2008
- Messages
- 15,989
- Points
- 113
The stock lens from the projector is not really designed to produce a "beam." The lens produces a VERY messy light. The projector does not "need" or even "want" a beam. The laser diodes are simply used to produce the blue and green (of off the phosphor disc) light needed. There are actually optics in the projector designed to "blur" the focused beam into a large blue light.
I don't even include the lens with the diode I sell any more. I do not know of one person using them for anything related to spot or beam work.
Peace,
dave
