focusing 405nM ebay 5mW

checking the thread on 'what do you use your ebay 405nM for,' the only mention of focusing the lens indicates the end had to be hacked off. i tried taking it apart from the inside but didn't like my chances.

has anyone managed to focus the lens on one of these without cutting it?

nice item, visible 'dot' for several hundred feet but discernibly dispersed (probably a foot wide per hundred feet). very bright, brighter than my super beast 100 for the first few hundred feet (the 100 doesn't like cold weather at all).

i should mention for anyone anxious to rush over any buy one.. i got one of the $2 with ~$5 shipping, took a month to get here.

Inside that laser, you have a diode and lens fixed together in place in a module.
In order to focus the laser, you need to move that lens which sits glued in front of the diode.

So no, you cannot magically make it focusable without taking it apart.

Also, acrynim for "nanometers" is "nm" with both letters in lower-case, not capital "m".

well, erm, what i would mean to say is, any recommentations for taking it apart without using a hacksaw, or uhm, fairie magycke?

NewWish type laser pens are taken apart very easily actually, all you have to do is grab the silver cap at the tip of it, firmly (with a vice, clothed to prevent aesthetic damage), and then slowly wiggle out the barrel in which the cap is pressfited.

That will seperate the cap and barrel with module inside (you remove the battery barrel before everything, just gets in the way).

Now, green pens have entire module attached to the cap so it comes out just like that.
Popular 405nm pens, like which you have, have their modules glued inside the barrel, but now with the cap gone, you can push them out of the barrel, so that they go out the side where cap was pressfited (you can't push it through the threads).

Not sure about how much force you'd have to apply as I have never taken apart 405nm NewWish pen. You'd have to ask somebody else for that.

P.S. Learn to use Shift and Caps Lock buttons on your keyboard. They exist for a reason.

THANKS! knowing whether something is threaded or pressfitted makes a lot of difference when disassembling

re: caps, i'm a developer, and the omittance of shift saves me a lot of energy throughout the course of the day/decades i tend towards inline scripting..

Oh that, yeah that's understandeable. C++ and others care for capital letters and all commands are strictly in lower-cases.

It's just my nit-picking, a lot of people are fine with it.

Myself, I just prefer my writing to be correct in every aspect of grammar and spelling.

But that's just me

hopefully i can say this without seeming injurious in the slightest.. i've been razzed for using lowercase in colloquial venues frequently for say 15 years.. you're the most forgiving of all the people who have mentioned it.

cheers for that (and for the correction on notation).

I can't say I know what "injurious" means, but thanks, I know what you mean

I also do some coding in C++, and I know how it goes. Besides, a lot of people just totally ignore capitals for sake of faster typing and that's so frequent I don't even pay much attention.

I have lots of time on my hands and I am not in a hurry, and I have developed a habit of using everything correctly, and it just kind of stuck. I can't help myself even if I wanted to write all lower-cases

Anyhow, once you get that pen apart, take some pictures and we'll work from there.

You can easily focus a 405nm or any laser without taking it apart. Just shine it through another "magnifying glass" type lens. I have a small lens (1") taken from a old rear projection TV that if taped on the front of an ebay 405nm pen will allow it to burn through dark paper...slowly but surely.