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Wie eine Lasershow für ein Promovideo filmen? Timingsettings und Gefahren

Like a laser show to film a promo video? Timing Settings and dangers



Frage von Der Abt:
März 2011

Hi,

We have supported the mission of an artist, of his show, with the laser is to make a promo video.
We basically work with 5D Mark II (Canon HF100 would be synonymous).

It is not the first video of his show, he told of many (not satisfactory) tests, which was much s.den timings (Shutterspeed and basic frame rate of the camera and especially the frequency of the laser) screwed a long time.

It is with the laser on the merits of a pyramid above projects, in which he stands (and he does not usually affected).
In this case, the problem of interference on the break as black bars and even sine waves, the black sides of the pyramid, which should not be.

Apparently so far came about the best results with a professional sony camera while they started with 50i.

Has anyone here experience with this problem?
Are there recipes (such as "Set the longest possible exposure time")?

The second problem is that lasers can destroy CMOS sensors.
The artist explained that this was the shooting of his performance synonymous happened already (he has, however, next to the ceiling lasers "partially synonymous" mobile "lasers in hand, with which he may umghergeschwenkt).

Can we need to assume that only can directly damage the camera incident laser light to the sensor, or synonymous of "normal" clothes, etc. reflected?
Of course there is always the chance of the stupid ring s.der hand, which occupies a corner become worse, or a shiny belt buckle ...

Or is the subject of the laser power, one could say that, under 300mW the risk is very low - if really is no direct exposure?

Right now I'm going to refuse the order more because I make a CMOS repair could not scare me, so the presence of a residual risk already.


'm Curious your opinions!

Greetings
Sven



Antwort von nordheide:

"The Abbot" wrote:
Hi,

We have supported the mission of an artist, of his show, with the laser is to make a promo video.
We basically work with 5D Mark II (Canon HF100 would be synonymous).

It is not the first video of his show, he told of many (not satisfactory) tests, which was much s.den timings (Shutterspeed and basic frame rate of the camera and especially the frequency of the laser) screwed a long time.

It is with the laser on the merits of a pyramid above projects, in which he stands (and he does not usually affected).
In this case, the problem of interference on the break as black bars and even sine waves, the black sides of the pyramid, which should not be.

Apparently so far came about the best results with a professional sony camera while they started with 50i.

Has anyone here experience with this problem?
Are there recipes (such as "Set the longest possible exposure time")?

The second problem is that lasers can destroy CMOS sensors.
The artist explained that this was the shooting of his performance synonymous happened already (he has, however, next to the ceiling lasers "partially synonymous" mobile "lasers in hand, with which he may umghergeschwenkt).

Can we need to assume that only can directly damage the camera incident laser light to the sensor, or synonymous of "normal" clothes, etc. reflected?
Of course there is always the chance of the stupid ring s.der hand, which occupies a corner become worse, or a shiny belt buckle ...

Or is the subject of the laser power, one could say that, under 300mW the risk is very low - if really is no direct exposure?

Right now I'm going to refuse the order more because I make a CMOS repair could not scare me, so the presence of a residual risk already.


'm Curious your opinions!

Greetings
Sven


Regarding the risk: Roll back the risk to the Principal.
A damaged chip can be easily seen.

The answers to other questions of interest to me synonymous.



Antwort von jogol:

http://forum.slashcam.de/clipkanal-laser-light-kills-canon-5d-mark-ii-vt85400.html?highlight=laser





Antwort von carstenkurz:

No chance for a test? Basically you need something for really no specific timing. You see tons of laser shows with regular video cameras recorded. Of course, the scanning of the laser systems have one or the other visible effect, but I never noticed something synonymous with 'error'. Tends to be longer exposure times.

If you look at you like the show times, then you will surely can find a position where you do not have to keep in one frontal unaufgeweiteten beam.

No idea what the relationship is allowed local energy densities for the audience (usually device is approved by TÜV and Show respectively subject to performance requirements) to the damage potential for CMOS sensors are available. One would think that such sensors are more robust.

- Carsten



Antwort von nordheide:

"Carsten short" wrote:
No chance for a test? Basically you need something for really no specific timing. You see tons of laser shows with regular video cameras recorded. Of course, the scanning of the laser systems have one or the other visible effect, but I never noticed something synonymous with 'error'. Tends to be longer exposure times.

If you look at you like the show times, then you will surely can find a position where you do not have to keep in one frontal unaufgeweiteten beam.

No idea what the relationship is allowed local energy densities for the audience (usually device is approved by TÜV and Show respectively subject to performance requirements) to the damage potential for CMOS sensors are available. One would think that such sensors are more robust.

- Carsten


In a recent American Idol show has once synonymous caught a live camera. Was then exchanged for the break. We saw a magnification point on TV.



Antwort von PeterM:

Gnaz principles.
C Mos cameras are bad t for laser shows.
Unless HD has to be then I would take ne old 3 chip CCD cam as SonyVX 2000th
I have already replied as synonymous in the linked thread the early 90s several hours laser show filmed material. Never auchg with a direct hit on it this cam is gone.
It does not depend on the laser power, (we used to run shows with 40 watts) but the intensity per square centimeter that is, the power density.
If the "Laserist" is s.die related safety regulations keeps going, at least in old Cams break anything.
What else can of course apply when waving laser pointers with the artist. Back then there were none laser pointer.
Today's laser pointer can have a few hundred mW. So you can burn a cigarette.

Regarding shutter times. This is absolutely difficult, because the scanning frequency (comparable to the refresh rate) of the laser may be between 10 Hz and 10 Khz. Seen in long exposure times are sinnoll.
Ultimately you have to try it. Man can s.Computer other settings for all common software solutions that scan rate.
One is the problem of beatings by niht but off we can influence one visually.



Antwort von Axel:

"Carsten short" wrote:
No idea what the relationship is allowed local energy densities for the audience (usually device is approved by TÜV and Show respectively subject to performance requirements) to the damage potential for CMOS sensors are available. One would think that such sensors are more robust.


The look in the mirror on which the laser point-like source is visible, is enough to charring a single optical cell. The point is up to ten thousand times brighter than its surroundings. A charred optical cell is "taken over" by the surrounding, "pixel mapping" so to speak. In CMOS a problem. My advice: Keep still!



Antwort von susy:

Look here:




Antwort von Markus_Krippner:

Could not solve the problem by a DOF adapter?
Then no direct light falls on the sensor.

... Mark :-)



Antwort von iMac27_edmedia:

CMOS laser shows at since I have seen numerous and I personally experienced
then take a s.besten PMW500 or PDW700 and good it is!



Antwort von soan:

I think a camera with CLS (adjustable shutter for precise frequency scanning) could be very helpful to the camera to adjust perfectly.

Condition. the frequency of the laser does not vary.

Secondly, I would appreciate that (instruct s.der fog machine according to specifications), a slight mist in the room can be of advantage.

Unfortunately I no experience in this regard, but would rely on the above things I ;-)



Antwort von iMac27_edmedia:

Rolling shutter is usually a mightier problem with laser shows, despite the RS-compensation!



Antwort von Axel:

"Soan" wrote:
I think a camera with CLS (adjustable shutter for precise frequency scanning) could be very helpful to the camera to adjust perfectly.

Condition. the frequency of the laser does not vary.


Frequency? You mean, like a fluorescent tube? Why do you think that laser light is flickering? Due to various strobe effects in the disco? They are mirror movements. Otherwise: the speed of light. Although light beam is simultaneously a wave and a particle, but the shutter sync with?

"Soan" wrote:
Secondly, I would appreciate that (instruct s.der fog machine according to specifications), a slight mist in the room can be of advantage.


It is true that the intensity of fog ussynonymous mitigated by scattering, but it serves primarily to radiation at all to visualize the. You know that yes, that one of a laser pointer only sees the point unless you have previously gequarzt properly again ;-)))
At risk for the CMOS does not change anything. The popular light tunnel have - whether distracted, scattered in a relatively strong or weak performance, a visible center that simply has too much energy.



Antwort von susy:

or you ask in advance where the laser is not hinleuchten and then place yourself out there.




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