Damaged Focus/Collimating Lens

[Guitarship1]

I have an Amazon Special, Dinsom brand blue laser. It has an adjustable lens in a brass holder that screws into the crown of the laser. It has somehow become damaged, would someone be kind enough to point to a suitable replacement, Pictures if need be. Thanks.

 

[Lifetime17]

Hi,
Show some pics and maybe someone could help
Rich

 

[Guitarship1]

There is the laser, The crown is removeable and the lens in threaded into the crown. No idea what damaged it..

 

[Lifetime17]

Hi,
Go on eBay and get a new lens I dont know what he threading is on these ,

 

[Guitarship1]

Yeah, I don't either, or which lens to get, hence the post.

 

[Lifetime17]

Hi,
Go on eBay and search for M9x0.5 laser lens
Rich

 

[Lifetime17]

I Can send you a plastic lens to try to determine the thread size. If it fits do not use it in your laser it will melt. The you can go on eBay and order a lens of M9x0.5 thread. I need your name and address to send the lens.
Rich

 

[RedCowboy]

It looks like this one, but ehh.... could be, looks like it's wideband AR coated glass so I expect it will work as long as the threads are correct, some use 8mm and some 9mm usually 0.5 pitch.

Optical Lens - Laser Pointer Store

This is the optical lens for most type of our store lasers. Package: 1 x optical lens

www.laserpointerstore.com

 

[WizardG]

Your old lens looks like it was killed by the laser beam itself. A plastic lens will just melt at the power we're putting through them. Glass lenses can crack or shatter if they have dust or other contamination on them.

 

[Guitarship1]

It looks like this one, but ehh.... could be, looks like it's wideband AR coated glass so I expect it will work as long as the threads are correct, some use 8mm and some 9mm usually 0.5 pitch.

Optical Lens - Laser Pointer Store

This is the optical lens for most type of our store lasers. Package: 1 x optical lens

www.laserpointerstore.com

Let me get some calipers and a thread pitch gauge and go from there.

 

[Guitarship1]

Your old lens looks like it was killed by the laser beam itself. A plastic lens will just melt at the power we're putting through them. Glass lenses can crack or shatter if they have dust or other contamination on them.

Its funny cause it worked the last time I used it, and then the next time, all messed up. I dont usually run for a long period of time. Shrug, who knows

 

[Guitarship1]

It looks like this one, but ehh.... could be, looks like it's wideband AR coated glass so I expect it will work as long as the threads are correct, some use 8mm and some 9mm usually 0.5 pitch.

Optical Lens - Laser Pointer Store

This is the optical lens for most type of our store lasers. Package: 1 x optical lens

www.laserpointerstore.com

Thank you

 

[Guitarship1]

I found an Amazon replacement lens. Optically it works fine. Mechanically its a bit too long. I thought the threads in the crown were tapped all the way through, but they are only partially tapped, and the lens bottoms out. With the laser completely screwed together, it wont really achieve much focus. Unscrewing the crown to lengthen the crown will achieve focus, but the machining on the threads isn't that great and it wobbles around abit. The two halves of the body unscrew and it will lengthen the laser, moving the lens away from the diode and focus that way. Still a little bit wobbly but I think another O-ring will take up some of the slack.