488nm Cyan laser - What ND filter would I need to lower the common ebay cyan laser to safe dot viewing

[Unown (WILD)]

Alright guys let's be more civil here

 

[atomd]

ok guys normally id back off cause this has gotten out of hand and im ineperienced by a lot. Only in braniacs video shows proof of what happens with an ND8 filter with a laser. I really wana discuss these findings no more arguing. Im not sure where you guys are leading me anymore


I want to use the laser like a bone head inside and stare into the dot. Nor do I wanna burn things Ive no interest in that. And Im talking about a, at most 70mw laser never 1w.

So with 70mw a cheap ND4 filter would reduce the power of the light to around 17mw "ish" which is a pretty safe number dont you think

AND.................................. in my original post I already said a 30mw 488nm laser cost 250$ the ebay one is 60$

seriously guys chill out please

So you'd rather believe some YT video that can be:

• totally fake
• guy made a mistake
• guy bought wrong type of filter and just burned through it
• any other reason

than one of many industrial / science sources quoted here + experience of people here?
Sign me out please. Even flat earthers at least try to make experiments

 

[Unown (WILD)]

So you'd rather believe some YT video that can be:

• totally fake
• guy made a mistake
• guy bought wrong type of filter and just burned through it
• any other reason

than one of many industrial / science sources quoted here + experience of people here?
Sign me out please. Even flat earthers at least try to make experiments

What did I just say? You can get your point across without insult. If he doesn't want to listen that's his deal.

 

[Nuguns]

So you'd rather believe some YT video that can be:

• totally fake
• guy made a mistake
• guy bought wrong type of filter and just burned through it
• any other reason

than one of many industrial / science sources quoted here + experience of people here?
Sign me out please. Even flat earthers at least try to make experiments

brainiac75 is the youtuber, He has some well founded stuff. He had a filter that he did burn thru in one video that was cheap plastic.

Maybe theres some misunderstanding here; I am under the impression that your math equation makes an "ND2 filter make a 70mw laser into a 0.7mw" -( wrong memory) - Its actually ND4 gets it to 7mw from the equation I did- after I crunched the numbers maybe Im doing that wrong idk. I do not believe that is right. Ur bein pretty rude, If theres something I dont get and ur trying to say it that would indeed be frustrating

I trust brainiac75's video so far.

I think using an ND filter is a cool idea to reduce a more than needed and unsafe beam to a toy at like 17mw ALSO that I could take it off and shoot the clouds with 70mw beam

An ND8 might produce a legally safe beam idk.... Im tired and dont wanna do the math anymore

 

[CurtisOliver]

Laser neutral density filters work by OD ratings. If you want a 70mW laser to become 7mW you need 10% transmission or OD1. Laser neutral density filters do not work the same way as camera filters. Camera filters have different jobs. Laser neutral density filters are log10 rather than log2. So if i only wanted 0.7mW or 1% transmission it’s OD2. To make the 70mW laser 5mW. You can run the calculation. -log(5/70) that gives you an OD rating of 1.146.

 

[Nuguns]

Laser neutral density filters work by OD ratings. If you want a 70mW laser to become 7mW you need 10% transmission or OD1. Laser neutral density filters do not work the same way as camera filters. Camera filters have different jobs. Laser neutral density filters are log10 rather than log2. So if i only wanted 0.7mW or 1% transmission it’s OD2. To make the 70mW laser 5mW. You can run the calculation. -log(5/70) that gives you an OD rating of 1.146.

so that guy was literally talking about "laser ND filters" the entire time.

I wanna use a camera filter cause theyre cheap.

Are you guys like not allowed to publicly endorse or approve of legally improper use or something, that would eplain a lot

I want a 17mw laser from a 70mw. I feel content with my irresponsibility unless someone who is emotionally open could speak to me like a human and sway me differently. Idk. this place has shown me loneliness and math

 

[Unown (WILD)]

so that guy was literally talking about "laser ND filters" the entire time.

I wanna use a camera filter cause theyre cheap.

Are you guys like not allowed to publicly endorse or approve of legally improper use or something, that would eplain a lot

I want a 17mw laser from a 70mw. I feel content with my irresponsibility unless someone who is emotionally open could speak to me like a human and sway me differently. Idk. this place has shown me loneliness and math

I don't know anything about these filters but everyone who posted on here gave you information you can use that even I can understand. I don't know why you aren't taking it in. Curtis just said
"Laser neutral density filters work by OD ratings. If you want a 70mW laser to become 7mW you need 10% transmission or OD1. Laser neutral density filters do not work the same way as camera filters. Camera filters have different jobs. Laser neutral density filters are log10 rather than log2. So if i only wanted 0.7mW or 1% transmission it’s OD2. To make the 70mW laser 5mW. You can run the calculation. -log(5/70) that gives you an OD rating of 1.146."
That's your answer.

BTW who is this brainiac guy? What video are you watching?

 

[Nuguns]

I don't know anything about these filters but everyone who posted on here gave you information you can use that even I can understand. I don't know why you aren't taking it in. Curtis just said
"Laser neutral density filters work by OD ratings. If you want a 70mW laser to become 7mW you need 10% transmission or OD1. Laser neutral density filters do not work the same way as camera filters. Camera filters have different jobs. Laser neutral density filters are log10 rather than log2. So if i only wanted 0.7mW or 1% transmission it’s OD2. To make the 70mW laser 5mW. You can run the calculation. -log(5/70) that gives you an OD rating of 1.146."
That's your answer.

BTW who is this brainiac guy? What video are you watching?

how do you delete posts here

 

[Unown (WILD)]

I can see deleted posts you know. I'm not being "neglectful". I told people to back off insulting you. That's not being neglectful, that's actually something that I chose to do in your behalf. Everyone here gave you solid information. This isn't one of those therapy safespaces where you can dump your insecurities on to everyone simply because you don't like what information you are getting or how you are getting it.
Why not bother brainiac about your issue then if you don't like what you're getting here?

 

[atomd]

so that guy was literally talking about "laser ND filters" the entire time.

I wanna use a camera filter cause theyre cheap.

Are you guys like not allowed to publicly endorse or approve of legally improper use or something, that would eplain a lot

I want a 17mw laser from a 70mw. I feel content with my irresponsibility unless someone who is emotionally open could speak to me like a human and sway me differently. Idk. this place has shown me loneliness and math

It was obvious for us you want laser ND filters as camera ND filters just won't survive the power densities. And any modern camera ND filters use log10 scale anyway, no clue where anyone found old log2 ND filter.

Either way another example that brainiac is guy with big magnets that pretends to know something and is dangerous to others instead of properly displaying his lack of knowledge. I'd rather he stick to monster magnets.

And no, laser ND filters aren't expensive, they're the cheapest thing that can safely do what you need

 

[Nuguns]

It was obvious for us you want laser ND filters as camera ND filters just won't survive the power densities. And any modern camera ND filters use log10 scale anyway, no clue where anyone found old log2 ND filter.

Either way another example that brainiac is guy with big magnets that pretends to know something and is dangerous to others instead of properly displaying his lack of knowledge. I'd rather he stick to monster magnets.

And no, laser ND filters aren't expensive, they're the cheapest thing that can safely do what you need

thanks dude for showing me that info. These others guys I found all of them in another thread doing the same crap instigating endless arguments.. Leaves me with a pretty awful feeling, I begin to suspect they want that

Im trying to look for a laser nd filter although Id need like the lowest to get the low beam. I got so messed up with the arguing I forget my points and math. What was it like 7mw with the laser ND, idk. That would be alright, Ive no idea where to look search engines are giving me tons of info articles so far.