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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. C3 CERT‏ @c3cert 20 Dec 2017
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      Replying to @marcan42 @datenwolf

      That is no point, CERT would have been involved. Only if fire safety is directly concerned, we get in contact with you. I don't know whoever let you take it down and why.

      1 reply 0 retweets 2 likes
    2. Hector Martin‏ @marcan42 20 Dec 2017
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      Replying to @c3cert @datenwolf

      Some angel asked for official German legal paperwork regarding the laser, which I obviously didn't have, and said I needed to take it down if I didn't have it.

      1 reply 0 retweets 0 likes
    3. C3 CERT‏ @c3cert 20 Dec 2017
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      Replying to @marcan42 @datenwolf

      That has not been a CERTling. "some angel"s behaviour I cant't explain or justify. Maybe you want to talk to PL / Orga.

      2 replies 0 retweets 1 like
    4. Hector Martin‏ @marcan42 21 Dec 2017
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      Replying to @c3cert @datenwolf

      Seems the person who requested the takedown was HonkHase.

      1 reply 0 retweets 0 likes
    5. datenwolf - flausching the curve‏ @datenwolf 21 Dec 2017
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      Replying to @marcan42 @c3cert

      If HonkHase says it's a problem, it's probably a problem. The guys it usually pretty chill and only takes out the ban-hammer if it could really create some trouble (which includes legal). But: You don't mess with HonkHase.

      1 reply 0 retweets 5 likes
    6. Hector Martin‏ @marcan42 21 Dec 2017
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      Replying to @datenwolf @c3cert

      It wasn't a problem every year prior, then suddenly all lasers disappeared on day 1 of 33c3. Whatever the problem was, it had nothing to do with individual lasers and everything to do with some kind of general decision, legal or otherwise.

      2 replies 0 retweets 0 likes
    7. datenwolf - flausching the curve‏ @datenwolf 21 Dec 2017
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      Replying to @marcan42 @c3cert

      Huh, actually on the 33c3 in the upper levels of the CCH there were a few high powered lasers, with a static beam configuration, also leaving the premises, which made me kind of nervous. If you can see a red laser beam without fog it's certainly beyond class-3a

      1 reply 0 retweets 0 likes
    8. Hector Martin‏ @marcan42 21 Dec 2017
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      Replying to @datenwolf @c3cert

      Laser classes are useless. The danger posed by a laser is way more complicated than what class it is. Any useful scanner is going to be Class 4 (mine is), but there's a huge difference between a laser pointer (static beam) and a scanner at a minimum distance.

      5 replies 0 retweets 1 like
    9. datenwolf - flausching the curve‏ @datenwolf 22 Dec 2017
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      Replying to @marcan42 @c3cert

      Class-3: Will cause eye damage. Class-4: Will set shit on fire. There are also subclasses. Most important for laser projectors: 3a vs 3b vs 3c. 3a is: Eye damage on direct exposure. 3b: Scattering off polished surfaces cause damage. 3c: Scattering off dull surfaces cause damage.

      1 reply 0 retweets 0 likes
    10. Hector Martin‏ @marcan42 22 Dec 2017
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      Replying to @datenwolf @c3cert

      Class 3 and 4 and their subclasses are all but useless. The actual result depends way too much on the specific circumstances. Obviously my class 4 laser projector neither sets shit on fire nor is harmful when scattered off a dull surface.

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      Hector Martin‏ @marcan42 22 Dec 2017
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      Replying to @marcan42 @datenwolf @c3cert

      And it's also below eye damage levels when scanned at appropriate speeds and distances (though you wouldn't want to *deliberately* aim it at people, i.e. audience scanning, without more thorough analysis as the safety margins are larger for that)

      1:35 AM - 22 Dec 2017
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        1. datenwolf - flausching the curve‏ @datenwolf 22 Dec 2017
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          Replying to @marcan42 @c3cert

          Just to reiterate: In our research we're scanning the laser, too, yet despite that we put a lot of emphasis on keeping the power safe for a static spot. The reason why? Nobody really knows if damages scales linearly with exposure time. It's ongoing research.

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        1. datenwolf - flausching the curve‏ @datenwolf 22 Dec 2017
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          Replying to @marcan42 @c3cert

          One of my colleagues spent months on the question if we could safely rise the power of our scanning spot from 1.6mW (one point six) to 2.0mW (two point zero) (milliwatts) on retina. Maybe I'm oversensitive here, because I've seen firsthand what damage even "weak" lasers can do.

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        2. datenwolf - flausching the curve‏ @datenwolf 22 Dec 2017
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          Replying to @marcan42 @c3cert

          I reiterate: Nobody knows for sure if scanning actually makes it eye safe. So far this is just an assumption that's based on a purely thermal model, assumes the eye to consist largely of water and the retina being a beer-lambertian absorber.

          1 reply 0 retweets 0 likes
        3. Hector Martin‏ @marcan42 22 Dec 2017
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          Replying to @datenwolf @c3cert

          It's not just scanning. Beams expand wider than the human pupil at sufficient distance (and are deliberately expanded for audience scanning setups) in order to also reduce peak power.

          0 replies 0 retweets 0 likes
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