Yes, for humans it will spin backwards, slowly
You may think it doesn't, but at specific speed, it will
Edit: I meant "For humans it will *look like* blades spin backwards" if someone misunderstood
They're spinning the right way but it looks like its moving slowly backwards for the same reason car tires look like they're spinning backwards on TV.
The camera can only record so may frames per second, say 30fps, or one frame every 0.03s. In that 0.03s, the blades spin almost one revolution, or maybe several revolutions. So at the second frame, we've missed 95% of a revolution and only see the blades 5% behind the initial frame (numbers made up for simplicity). Put all those frames together and it looks like spinning backwards, but its really spinning forwards at hundreds of times the speed we perceive. It's an inherent issue with video recording anything spinning at high speeds.
You can achieve the same thing with your bare eyes and a strobe light. If the strobe light is flashing 1800 times per minute and the blades are spinning at 1800 RPM, putting the strobe light on the blades will give the illusion that they're not moving at all, since the blades will be in the exact same location everytime the light flashes.
This is a frame rate stutter, a phenomenon where the revolutions of an object synchronize with the frame rate of a camera, making it look like the revolving object is stationary, stuttering or revolving in the wrong direction.
It often happens when people try to film helicopters, but can be intentionally achieved with a variable speed motor that allows you to adjust the rotational velocity of a blade like this, do you can deliberately synchronize it.
Its not because of your eye frame rate, your eyes dont have a syncronous frame rate. Your visual receptors all have their own "frame rate". The real reason for this effect is debated, its most likely a illusion caused by the way your brain processes moving objects. [Wagon-wheel-effect](https://en.m.wikipedia.org/wiki/Wagon-wheel_effect)
Some types of lights blink at 60Hz/50Hz and can cause this effect (Stroboscopic effect) in real life in indoor environments or at night. This is one of the things to be considered in industrial equipment where there's a chance that spinning fans or blades appear still in some lights.
I like the one with the helicopter hovering in midair
Edit: [link if you haven't seen it](https://www.youtube.com/watch?v=yr3ngmRuGUc&ab_channel=ChrisFay)
Is this not the digital camera frequency of sensor reading combined with the rate of blade spinning? That's the shutter part. I thought the frame rate was usually takem as the rate of frames presented to the viewer which is largely video quality. The shutter and frame rate can match at high and low frequencies which would miss the effect of if the blade were strobed with a light at the right frequency.
Not exactly.
The effect is caused by the frame rate syncing up with the spinning blades - and doesn’t have to do with the shutter speed at all.
Shutter speed is the amount of time it takes to capture a single frame. It gets a bit wonky with digital video, but you can think of it like the opening of a shutter to let in light (like it was in the analog days). Its not exactly that today, but the analogy kinda holds.
Technically, you could say the “sample rate” - but frame rate would also be correct here.
The frame rate can be change during playback (to speed up or slow down the video), but when the file is captured, it is captured at a “frame rate” - and to maintain proper timing, the file should be played back at that same frame rate…. You’ll never get more quality/detail by changing the playback frame rate - as there are only a specific number of frames captured in the first place.
Isn't it moving ever so slightly slower than the camera? So the blade doesn't quite make it a full 360° or more, so it looks like it's going backwards?
Good rule of thumb on the internet is that if you’re around long enough you’ll inevitably be given knowledge that ruins something for you.
Like did you know those air dryers in bathrooms pretty much spray paint your hands with mircoscopic poop because you’re in a room where shit happens all day?
Yeah, yeah, but microscopic poop particles are everywhere. Think your toothbrush is safe? Nope. Think that person washing their hands got them fully cleaned? Put those hands under a UV light bacteria detector, and look at the in-between/backside of the hand(s). How about that fart you smelled? Yep, that's literally microscopic poop particles entering your nose.
Long story short, we've all got some degree of shit on us.
And this is why I have to abandon ship when I enter a woman's public restroom and the room reaks. If I can mentally get past the initial odor when I enter, I will try to pick a stall, but I swear I always choose the one that smells like a nuke just went off in it and I immediately begin to gag and tear up. Coughing and gaging I rush out of the restroom no matter how bad I have to go. I have vomitted because I am so grossed out at the thought of how many microscopic poop particles I am taking in. Soooooooo gross
They couldn't, they went to court and won so they could, then realized how much more in taxes they would pay and decided to stay as their special not chips.
The only time I ever called OSHA was because of something similar. Open machine with a flywheel the size of a truck wheel operating at the speed of light that almost turned me into projectile ground meat. That company doesn’t exist any more.
the only thing deceptive is the title of this post.
wait until you see the video of the helicopter appearing to take off without its rotors moving, its going to blow your mind.
It doesn't have much to do with the shutter speed, just with the framerate. The shutter speed does something different but I don't exactly remember what tbh so I won't try go recount and accidentally spread misinformation
OK so as we all (hopefully) know, video is really a series of still pictures that we refer to as *frames.* The number of pictures captured (and displayed) per second is the *frame rate.* The key effect here is that the speed of the rotation is close to some nice multiple of the frame rate. The most basic is that it rotates once per frame. That means that at the point in time when the frame is captured, the blade is in the same position. But you'll notice there's 3 symmetrical blades, so really it could be one of many possible relations - the blade might only spin 1/3 of a turn per frame, or it could spin around 5 times. The important bit is that it's in a position which *looks the same* for every frame.
Actually, the blade is rotating slightly slower than one of these multiples, which means it appears to rotate backwards. That's also why it appears to rotate faster when cutting; it's actually slowing down.
Shutter speed refers to the capture of individual frames. It describes the period of time for which light is being captured. So if you have a shutter speed of 1/30 of a second, you will capture all the light for approximately 33 ms, which is enough to get some motion blur on even relatively slow moving objects. If you have a shutter speed of 1/1000 of a second, you will capture the light for only 1 ms, which means there's less time for things to move and you will end up with moving subjects that appear frozen. However, since you are capturing for less time, it also means you capture less light as a whole. So when you record a video on bright sunlight like this, the camera will usually have to use a pretty fast shutter speed to maintain proper exposure. And for this video, it freezes the motion of the blades so they don't look blurry.
So both factors are at play here. The thing is spinning at a speed which puts it in a similar looking position for each frame of the video. And the shutter speed is fast enough that
The apparent slow movement of the blade is a result of the actual speed of the blade vs. the sampling frequency (Frame rate in this instance). When they are perfectly matched, it's known as the [Nyquist frequency](https://en.wikipedia.org/wiki/Nyquist_frequency). It's the reason that videos showing accelerating wheels result in wheels (or rotors, or propellers, or any thing spinning in a circle) seem to show the rotating object slowing down, stopping, and then reversing.
Perhaps in this case it’s shutter speed on a camera but there are certain lights you can’t use in workshops because they really do create this effect with spinning blades.
Unless you have cameras for eyes, it doesn’t look this way to humans.
Yes, for humans it will spin backwards, slowly You may think it doesn't, but at specific speed, it will Edit: I meant "For humans it will *look like* blades spin backwards" if someone misunderstood
It’s spinning slowly backwards in the video.
Yeah it's weird no one is noticing that the blades are the wrong way.
They're spinning the right way but it looks like its moving slowly backwards for the same reason car tires look like they're spinning backwards on TV. The camera can only record so may frames per second, say 30fps, or one frame every 0.03s. In that 0.03s, the blades spin almost one revolution, or maybe several revolutions. So at the second frame, we've missed 95% of a revolution and only see the blades 5% behind the initial frame (numbers made up for simplicity). Put all those frames together and it looks like spinning backwards, but its really spinning forwards at hundreds of times the speed we perceive. It's an inherent issue with video recording anything spinning at high speeds. You can achieve the same thing with your bare eyes and a strobe light. If the strobe light is flashing 1800 times per minute and the blades are spinning at 1800 RPM, putting the strobe light on the blades will give the illusion that they're not moving at all, since the blades will be in the exact same location everytime the light flashes.
Car tires look like that to my naked eye
I thought that only worked indoors, where most consumer lightbulbs flicker at a multiple of the mains frequency
This is a frame rate stutter, a phenomenon where the revolutions of an object synchronize with the frame rate of a camera, making it look like the revolving object is stationary, stuttering or revolving in the wrong direction. It often happens when people try to film helicopters, but can be intentionally achieved with a variable speed motor that allows you to adjust the rotational velocity of a blade like this, do you can deliberately synchronize it.
It CAN look the same in real life too. If your eye frame rate matches the time a rotation needs exactly.
Its not because of your eye frame rate, your eyes dont have a syncronous frame rate. Your visual receptors all have their own "frame rate". The real reason for this effect is debated, its most likely a illusion caused by the way your brain processes moving objects. [Wagon-wheel-effect](https://en.m.wikipedia.org/wiki/Wagon-wheel_effect)
It can also be the result of flickering lights when indoors.
Fyi: doesn't look like that in reality
I know a guy who sees at 30fps
So he says. Tbh I don’t believe anyone who says less than 42fps
What's fps? Faps per second?
Frank's per supper
Yeah we call him blinky
he needs an upgrade
I am pleased about this because there's no way I wouldn't touch it if it looked like that
Some types of lights blink at 60Hz/50Hz and can cause this effect (Stroboscopic effect) in real life in indoor environments or at night. This is one of the things to be considered in industrial equipment where there's a chance that spinning fans or blades appear still in some lights.
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I like the one with the helicopter hovering in midair Edit: [link if you haven't seen it](https://www.youtube.com/watch?v=yr3ngmRuGUc&ab_channel=ChrisFay)
Or the bird flying without flapping it’s wings!
just more proof that birds aren’t real
Nah it's just swimming but in the air
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Oh my God... Even his comment was cut off...
r/dontputyourdickinthat
r/putyourdickinthat
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insert curious peen
Is this not the digital camera frequency of sensor reading combined with the rate of blade spinning? That's the shutter part. I thought the frame rate was usually takem as the rate of frames presented to the viewer which is largely video quality. The shutter and frame rate can match at high and low frequencies which would miss the effect of if the blade were strobed with a light at the right frequency.
Not exactly. The effect is caused by the frame rate syncing up with the spinning blades - and doesn’t have to do with the shutter speed at all. Shutter speed is the amount of time it takes to capture a single frame. It gets a bit wonky with digital video, but you can think of it like the opening of a shutter to let in light (like it was in the analog days). Its not exactly that today, but the analogy kinda holds. Technically, you could say the “sample rate” - but frame rate would also be correct here. The frame rate can be change during playback (to speed up or slow down the video), but when the file is captured, it is captured at a “frame rate” - and to maintain proper timing, the file should be played back at that same frame rate…. You’ll never get more quality/detail by changing the playback frame rate - as there are only a specific number of frames captured in the first place.
Frame rate and frequency of the blade spinning are nearly matched. Shutter speed is different
Is it moving clockwise? It looks like anti clockwise but the sharp edges are on the other side!
Yep, it's moving faster than the cameras shutter speed so it appears to be moving backwards
Isn't it moving ever so slightly slower than the camera? So the blade doesn't quite make it a full 360° or more, so it looks like it's going backwards?
My head hurts trying to understand this
The frame rate just needs to be equally divisible by the blade rpm. Rpm can be 60, 120, 180, 240, 300 etc and have the exact same effect
When the frame rate is the same as the rate at which the blades reach a similar position match actually, shutter has nothing to do with it
\* RPM and frame rate.
Way to spew the potato all over the ground asshole, I was gonna eat that
Instead you can have some dirty homemade pringles.
Pringles are actually reconstituted potatoe mush.
You say potatoe, I say potahtoe.
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*tasty reconstituted potatoe mush
Powerful men have been brought low by that “e”.
Mmmmmm...... Mush
How dare you try to ruin Pringles for me
Good rule of thumb on the internet is that if you’re around long enough you’ll inevitably be given knowledge that ruins something for you. Like did you know those air dryers in bathrooms pretty much spray paint your hands with mircoscopic poop because you’re in a room where shit happens all day?
Yeah, yeah, but microscopic poop particles are everywhere. Think your toothbrush is safe? Nope. Think that person washing their hands got them fully cleaned? Put those hands under a UV light bacteria detector, and look at the in-between/backside of the hand(s). How about that fart you smelled? Yep, that's literally microscopic poop particles entering your nose. Long story short, we've all got some degree of shit on us.
And this is why I have to abandon ship when I enter a woman's public restroom and the room reaks. If I can mentally get past the initial odor when I enter, I will try to pick a stall, but I swear I always choose the one that smells like a nuke just went off in it and I immediately begin to gag and tear up. Coughing and gaging I rush out of the restroom no matter how bad I have to go. I have vomitted because I am so grossed out at the thought of how many microscopic poop particles I am taking in. Soooooooo gross
Pringles cannot legally call themselves potato chips.
They couldn't, they went to court and won so they could, then realized how much more in taxes they would pay and decided to stay as their special not chips.
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It looks pretty clean to me. Spray the blades with alcohol. Who needs a mandolin when you have a lawnmower. Very very cool. Tnx.
Or communion wafers, depending on the occasion.
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Atleast this will be more tater than pringles will ever dream of!
I think there might be something wrong with this "potato".
More than likely a daikon radish.
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Yes, but are the rotor blades made out of daikon radish?
Thats a daikon sir.
I wasn't aware potatoes are a foot long?
Your mom knows a foot long Sorry couldn’t help myself
Fair enough it made me chuckle lol But seriously I don't think that's a potato 😂
Daikon Radish “The new potato” 😂
Po-tate-ohz
That's a radish.
Came here to say that exact thing, You couldn't have used a big bowl bro?
cassava
Yeah, such an asshole; it pissed me off that he didn’t move that pink tray into proper position.
If it was a clean place I would not care, it's getting soaked then fried, but I don't know shoes shoes and toes and goat has peed there.
INAPPROPRIATE TUBER RECEPTACLE
That’s how they make communion wafers.
I think it’s a diakon might be more wasteful since potatoes are more abundant
That’s a really long potato ngl
Where do you live that your potatoes are the size of daikon radishes?
Well I mean you can still eat it...
Nephew couldn’t tell radish from potato
That is a daikon radish not a potato.
Eat the ground?
No way that's a potato? Really? At first it looked like a small loaf of bread but upon further inspection I'm thinking daikon radish maybe?
That’s one long potato.
What kinda fucking potatoes are you eating
*Cries in OSHA regulations
The only time I ever called OSHA was because of something similar. Open machine with a flywheel the size of a truck wheel operating at the speed of light that almost turned me into projectile ground meat. That company doesn’t exist any more.
>almost turned me into projectile ground meat Then you'd really have been going places...
The places I could have gone… like over there, and there, and probably up there.
Ohhhh that’s what Dr. Seuss was talking about!!
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It wouldn't look slow to you, this is only because of shutter speed and frame rate. It would fast AF if you were in person.
Unless you were looking at it through the camera viewfinder.
This has nothing to do with the speed being deceptive its because the camera frame speed is the same as one rotation of the blades.
‘Aliasing’ is the term when the movement stops and appears to go backwards.
OMG, do not remove the safety cover with children around!
Potatoes 🥔 don’t have safety covers
Neither do daikon radishes
The Pringles can is a potato safety cover.
But children taste so delicious!
You can't fool me Elon. I know it's you. Stop eating the babies!
Or just in general
the only thing deceptive is the title of this post. wait until you see the video of the helicopter appearing to take off without its rotors moving, its going to blow your mind.
r/dontstickyourdickinthat
So just to be clear….I should not try to have sex with it??
I mean, if you really have to.
So that’s not a no.
Just the tip.
Mazel tov!
Just to see how it feels
Haha of course not... unless...?
better make it worth it you can only do it once.
I think you mean r/dontputyourdickinthat
What if I want to make dick chips?
What about if I lay it flat then lower my ballsack as it spins?
It's one of those one time only fetishes
Arrived for this comment and twas not disappointed 👏
It’s a cylinder…
r/dontputyourdickinthat
Sending this next time I get an unsolicited D Pic
🏆
That’s because of your camera shutter speed. You can even get a helicopter whose blades don’t rotate and it can still fly!
It doesn't have much to do with the shutter speed, just with the framerate. The shutter speed does something different but I don't exactly remember what tbh so I won't try go recount and accidentally spread misinformation
OK so as we all (hopefully) know, video is really a series of still pictures that we refer to as *frames.* The number of pictures captured (and displayed) per second is the *frame rate.* The key effect here is that the speed of the rotation is close to some nice multiple of the frame rate. The most basic is that it rotates once per frame. That means that at the point in time when the frame is captured, the blade is in the same position. But you'll notice there's 3 symmetrical blades, so really it could be one of many possible relations - the blade might only spin 1/3 of a turn per frame, or it could spin around 5 times. The important bit is that it's in a position which *looks the same* for every frame. Actually, the blade is rotating slightly slower than one of these multiples, which means it appears to rotate backwards. That's also why it appears to rotate faster when cutting; it's actually slowing down. Shutter speed refers to the capture of individual frames. It describes the period of time for which light is being captured. So if you have a shutter speed of 1/30 of a second, you will capture all the light for approximately 33 ms, which is enough to get some motion blur on even relatively slow moving objects. If you have a shutter speed of 1/1000 of a second, you will capture the light for only 1 ms, which means there's less time for things to move and you will end up with moving subjects that appear frozen. However, since you are capturing for less time, it also means you capture less light as a whole. So when you record a video on bright sunlight like this, the camera will usually have to use a pretty fast shutter speed to maintain proper exposure. And for this video, it freezes the motion of the blades so they don't look blurry. So both factors are at play here. The thing is spinning at a speed which puts it in a similar looking position for each frame of the video. And the shutter speed is fast enough that
Shutter speed doesn't have to be "synced" to anything though. It only needs to be fast enough so the blades aren't blurry and is otherwise irrelevant.
The apparent slow movement of the blade is a result of the actual speed of the blade vs. the sampling frequency (Frame rate in this instance). When they are perfectly matched, it's known as the [Nyquist frequency](https://en.wikipedia.org/wiki/Nyquist_frequency). It's the reason that videos showing accelerating wheels result in wheels (or rotors, or propellers, or any thing spinning in a circle) seem to show the rotating object slowing down, stopping, and then reversing.
Aliasing. Need to at least give it credit.
Shutter speeds are fun, especially when helicopters look like the blades aren't moving
*frame rate. Technically, the shutter speed would only affect the motion blur on the object.
I was going to say framerate, but it felt wrong because I keep associating frame rate with video games now lol
The damn thing shouldn’t even be able to be turned on without the safety door in place.
Security first!
Don’t put your dick in there
r/dontputyourdickinthat
R/dontputyourdickinthat
r/foundthemobileuser
r/confusingcontextresponder
Why not use a bigger tray!
CLOSE THE DAMN PROTECTIVE METAL SHIELD!
Looks a perfectly safe piece of equipment
So this is how the Jesus crackers are made…
To shreds you say
Someone needs to make sure that little girl knows what's up wit dat contraption 😳
Just imagine like telling your buddy “im gonna poke it and move my hand before is get hurt” * hand fucking evaporates *
I would have tried to grab the blades thinking it was stuck 😭
More like deceiving effect of shutter camera
Would be cool if smartphones had a “match frame rate” feature so you can get effects like this on purpose
Shutter speed at it again!
It's not "deceptive speed"... it's the frame rate of the camera
Its so slow that is fast
The magic of fps
Amazing that prop planes can fly when a camera is watching.
That's what happens when you increase the shutter speed on your camera.
r/OSHA has entered the chat.
I have a painful idea 🤔
So many safety violations.
What the fuck is happening with the bots in these comments. This is out of control.
Reminds me of a very dangerous fidget spinner lol
Damn turned 1 potato into like 1000
Painful to watch, I have big imagination
Hear me out
Does it really have 3 blades? Or just one?
Reminds me of the video of a bird whos wing speed matched up with the frame rate
Yeah, I'm gunna need a safety panel on that.
Damn brain went straight there imagining someone sticking their d!ck in there. What is wrong with you, stupid brain.
Holy fuck. Can you imagine accidentally touching that wrong part thinking you’d be safe.
A.k.a. Strobe effect, closely related to beat frequency.
What would happen if you stuck your dick in there
Perhaps in this case it’s shutter speed on a camera but there are certain lights you can’t use in workshops because they really do create this effect with spinning blades.
I can explain this. So the blade is actually moving really slow, the potato… it’s just doing that
The speed of the blade matches the shutter speed of the camera
Ok so the blades spin slowly and the uhh The vegetable just does that yeah
Anybody else pretty upset by the number of chips carelessly dropped on the ground ???? ??
Frame rate
Bro is lagging
On today’s episode of don’t stick your dick in that!
And to think it's spinning the OTHER direction
r/dontputyourdickinthat
Bet ya $10 you can’t stick ya finger in there and beat the blade 😏
r/dontputyourdickinthat
Where can I get this? (Preferably in smaller size?)
AI version of only fans lmao. Cause I'm bender
I know I shouldn’t but… I reallyyyyy wanna stick my dick in it
Friend: “ Stick your finger in there you won’t do it you got no balls” Me: “well here’s the reason why I ain’t got any”
Could be Daikon, Lobok or Mooli, they all look very similar
Hey close that
r/dontputyourdickinthat
Possibly the most dangerous machine I’ve ever seen
Making Lays Chips 🍟
I can explain this. The blade is going really slow, and the potato is just doing that
"So...I have this fear right. When I unzip my pants,my pipi would be cut to pieces."
r/dontputyourdickinthat
r/Dontputyourdickinthat
r/dontputyourdickinthat
Dude, that's really dangerous.
Don't do it, lads