A pinhole camera has no lens. The effect here is like a pinhole camera, but a pinhole camera is nothing at all like a lens. Pinholes diffract light. Lens refract light.
EDIT: Of course you can't resolve an image through diffraction. That's not how pinholes cameras work. Diffraction negatively impacts image resolution, but it absolutely happens when light passes through them. But, although lens do use refraction to resolve an image, that same process also has unintended negative effects on image resolution (spherical aberration, chromatic aberration, etc.). I didn't bring up any of that because it was ultimately a distraction from the important part: narrow gaps diffract light, lens refract light, and pinhole cameras do not work like lens.
The diffraction effects from a pinhole camera are not what make them work. In fact, diffraction makes the photographs worse than they otherwise would be. The pinhole makes an effective aperture for photography because it's small size produces small circles of confusion on the film plane. Ideally, you would make the hole as small as possible, but beyond a certain (small) size, defraction becomes the dominant source of blurring. So the size of the pinhole should be chosen to yield the best balance between geometric blur and diffraction blur.
The diffraction is merely a limit to the smallness of the aperture, and not what creates the image.
If you didn't intend to imply that, it's on how you communicated, not how they interpreted it. The way you listed what each does implied you were saying that's how their images worked.
You directly contrasted them. Refraction is obviously key to how lenses work. So it seemed to me like you were saying that diffraction is key to how pinholes work. 🤷
Yea, but you could achieve this by placing a circle of cardboard in the middle or a ring that you attach to your lens.
I don't remember the guy but YT shorts I've seen a guy testing all sorts of different shapes and filters in front of his lenses or even just in front of his sensor without a lens.
Our window blinds at school had tiny holes in them for the strings to go through and they had the exact same effect. You could see the eclipse projected once the tables.
in the house i grew up in, when the blinds were down in my window i would have a camera obscura for like half an hour each day. it made sick days more tolerable.
Once I hitched a ride on the back of a empty meat truck, so it was pitch black, some minutes in my eyes got used to the dark and started to notice a projection on the front wall and I could somewhat see what was behind the truck, even got to id car models.
It’s uncanny and special for someone to be looking the other way during an eclipse.
During the two minutes of totality I tried really hard to take in as much as I possibly could. The light was very weird the entire time and because I wasn't looking at the sun and moon when it happened, I saw the weird wavey shadow things as totality ended. Absolutely incredible experience and I highly recommend everyone experience it at least once in their life!
Unless it was an annular eclipse, or it was a total eclipse and they weren't in the path of totality. Then this is all they would see. Regardless without eclipse glasses you shouldn't look at either eclipse at all.
You can glance at the sun but don't stare at it. Even when it's only 1% visible, it's putting out enough light to strain or damage your eyes.
Though it's fine to look at the eclipse with naked eyes when it's total. You can't really see the cool effect surrounding the moon during totality with the eclipse glasses on because it's way dimmer than the sun usually is.
Your eyes will tell you if it's safe to look. If it's uncomfortably bright, then you shouldn't power through that discomfort (and that applies to things other than the sun). If it feels like looking at anything else, then it's probably fine.
We have LED street lights and our driveway is lined with crepe myrtles. Every evening after dark, I can see the grid pattern of the individual LEDs in the shadows on our driveway. It's trippy when there's a slight breeze, and all these little "grid shadows" are moving around overlapping each other
You can make a hole with your fingers and see the patterns of very bright lights above you, stadium lights etc. It's just a vertical camera obscura. I remember the 90s solar partial eclipse really well because I was riding home from school, the leaves and even the spokes on my bike projected moons everywhere, it was completely magical.
Ah nice! I liked the Lancairs, i got to fly one of them. For working in i think Pipers were my favorite, especially the Malibu. Plenty of space and logical layouts.
I guess working in the engines was nicer in the Cessnas since there was less baffling and no turbo, less places to drop books and nuts.
54 Comments
Triumph@fedia.io · 75 pts · 322d
The reason this happens is because the tiny gaps between the leaves act as lenses, like in a pinhole camera.
Wolf314159@startrek.website · 22 pts · 322d
A pinhole camera has no lens. The effect here is like a pinhole camera, but a pinhole camera is nothing at all like a lens. Pinholes diffract light. Lens refract light.
EDIT: Of course you can't resolve an image through diffraction. That's not how pinholes cameras work. Diffraction negatively impacts image resolution, but it absolutely happens when light passes through them. But, although lens do use refraction to resolve an image, that same process also has unintended negative effects on image resolution (spherical aberration, chromatic aberration, etc.). I didn't bring up any of that because it was ultimately a distraction from the important part: narrow gaps diffract light, lens refract light, and pinhole cameras do not work like lens.
Quibblekrust@thelemmy.club · 10 pts · 321d
The diffraction effects from a pinhole camera are not what make them work. In fact, diffraction makes the photographs worse than they otherwise would be. The pinhole makes an effective aperture for photography because it's small size produces small circles of confusion on the film plane. Ideally, you would make the hole as small as possible, but beyond a certain (small) size, defraction becomes the dominant source of blurring. So the size of the pinhole should be chosen to yield the best balance between geometric blur and diffraction blur.
The diffraction is merely a limit to the smallness of the aperture, and not what creates the image.
Wolf314159@startrek.website · -5 pts · 321d
I didn't say this, you did. You're chasing your own tail.
Buddahriffic@lemmy.world · 3 pts · 321d
If you didn't intend to imply that, it's on how you communicated, not how they interpreted it. The way you listed what each does implied you were saying that's how their images worked.
Quibblekrust@thelemmy.club · 2 pts · 321d
You made a parallel sentence construction:
You directly contrasted them. Refraction is obviously key to how lenses work. So it seemed to me like you were saying that diffraction is key to how pinholes work. 🤷
Dasus@lemmy.world · 1 pts · 321d
Yea, but you could achieve this by placing a circle of cardboard in the middle or a ring that you attach to your lens.
I don't remember the guy but YT shorts I've seen a guy testing all sorts of different shapes and filters in front of his lenses or even just in front of his sensor without a lens.
Can't recall who.
Anyhow
Opisek@piefed.blahaj.zone · 3 pts · 322d
Our window blinds at school had tiny holes in them for the strings to go through and they had the exact same effect. You could see the eclipse projected once the tables.
baltakatei@sopuli.xyz · 33 pts · 322d
Sunlight is always doing this. It's just that we call overlapping projections of a boring white-filled circles “dappled sunlight”.
ameancow@lemmy.world · 20 pts · 321d
HeyThisIsntTheYMCA@lemmy.world · 11 pts · 321d
in the house i grew up in, when the blinds were down in my window i would have a camera obscura for like half an hour each day. it made sick days more tolerable.
ChanchoManco@lemmy.zip · 7 pts · 321d
Once I hitched a ride on the back of a empty meat truck, so it was pitch black, some minutes in my eyes got used to the dark and started to notice a projection on the front wall and I could somewhat see what was behind the truck, even got to id car models.
mEEGal@lemmy.world · 23 pts · 322d
You can actually use this, or more generally the shadow of a tree on any sunny day to calculate the distance to the sun !
(Can't seem to find the video demonstrating it, but I have a feeling it's from Physics Girl or Up And Atom on youtube)
Wolf314159@startrek.website · 10 pts · 322d
The ratio of the size of the image to the distance from the pinhole is the same as the ratio of the size of the sun to the distance to the sun.
Quibblekrust@thelemmy.club · 5 pts · 321d
Only if you know the sun's size, which kind of presupposes you know its distance.
mEEGal@lemmy.world · 1 pts · 320d
Strictly speaking, it's not required, but I get your point.
In any case, you can evaluate the relative sizes, which is cool enough ! (⚠️ nerd alert ⚠️)
Zkuld@lemmy.world · 4 pts · 322d
how?
mEEGal@lemmy.world · 4 pts · 322d
My gut says Thales' thorem, but this needs checking.
That's why I was looking for the video
mmmac@lemmy.zip · 1 pts · 322d
Akasazh@feddit.nl · 16 pts · 321d
It's uncanny and special for someone to be looking the other way during an eclipse.
It's so short and a rare enough even that would make earth a tourist hotspot for extraterrestrials if there ever was interplanetary tourism.
Trainguyrom@reddthat.com · 11 pts · 321d
During the two minutes of totality I tried really hard to take in as much as I possibly could. The light was very weird the entire time and because I wasn't looking at the sun and moon when it happened, I saw the weird wavey shadow things as totality ended. Absolutely incredible experience and I highly recommend everyone experience it at least once in their life!
InputZero@lemmy.world · 7 pts · 321d
Unless it was an annular eclipse, or it was a total eclipse and they weren't in the path of totality. Then this is all they would see. Regardless without eclipse glasses you shouldn't look at either eclipse at all.
Buddahriffic@lemmy.world · 2 pts · 321d
You can glance at the sun but don't stare at it. Even when it's only 1% visible, it's putting out enough light to strain or damage your eyes.
Though it's fine to look at the eclipse with naked eyes when it's total. You can't really see the cool effect surrounding the moon during totality with the eclipse glasses on because it's way dimmer than the sun usually is.
Your eyes will tell you if it's safe to look. If it's uncomfortably bright, then you shouldn't power through that discomfort (and that applies to things other than the sun). If it feels like looking at anything else, then it's probably fine.
Akasazh@feddit.nl · 2 pts · 321d
I witnessed a partial one, with eclipse glasses. Still I didn't have the time or observational talent to notice the effect on the shadows
Hathaway@lemmy.zip · 1 pts · 321d
Or they had a camera recording.
gmtom@lemmy.world · 4 pts · 321d
You only see this during the partial stage of the eclipse, not during totality, which can last a long time.
Akasazh@feddit.nl · 1 pts · 321d
I witnessed a partial eclipse, didn't notice the shadow effect. I might pay attention next time...
pupbiru@aussie.zone · 1 pts · 320d
uncommon on earth is common in the galaxy/universe
Akasazh@feddit.nl · 1 pts · 320d
But the distance and relative size between our moon and star is so unique that even on a Galaxy scale that would be the number one touristic event.
https://www.theatlantic.com/science/archive/2024/04/total-solar-eclipse-earth-universe-unique/677937/
gmtom@lemmy.world · 13 pts · 321d
Picture I took in Texas during the eclipse
joshthewaster@lemmy.world · 16 pts · 321d
Here is one I took using our hands to create the effect.
stochastic_parrot@sh.itjust.works · 5 pts · 321d
I'm having a hard time understanding this. How many hands do you have? How can you use 2 hands to create this effect and still hold a camera?
TheOakTree@lemmy.zip · 8 pts · 321d
They said our hands. Clearly they are a conjoined twin with 3+ arms.
joshthewaster@lemmy.world · 4 pts · 320d
Busted lol
pyre@lemmy.world · 7 pts · 320d
we're not going through this again
supersquirrel@sopuli.xyz · 4 pts · 320d
why? They clearly have crab claws for hands, how else would that picture be possible.
hakunawazo@lemmy.world · 4 pts · 320d
tipicaldik@lemmy.world · 12 pts · 321d
We have LED street lights and our driveway is lined with crepe myrtles. Every evening after dark, I can see the grid pattern of the individual LEDs in the shadows on our driveway. It's trippy when there's a slight breeze, and all these little "grid shadows" are moving around overlapping each other
ThunderQueen@lemmy.world · 1 pts · 321d
BanMe@lemmy.world · 7 pts · 320d
You can make a hole with your fingers and see the patterns of very bright lights above you, stadium lights etc. It's just a vertical camera obscura. I remember the 90s solar partial eclipse really well because I was riding home from school, the leaves and even the spokes on my bike projected moons everywhere, it was completely magical.
ThunderQueen@lemmy.world · 1 pts · 320d
MasterOKhan@lemmy.ca · 7 pts · 322d
Best bokeh balls
latenightnoir@lemmy.blahaj.zone · 7 pts · 322d
Heey, it's Elden Ring!
ivanafterall@lemmy.world · 1 pts · 321d
Heey, it's the intro to Heroes on NBC
tdawg@lemmy.world · 6 pts · 321d
Thought it was just my coffee table
justlemmyin@lemmy.world · 5 pts · 322d
well technically thats shadow of moon multiplied "naturally".
supersquirrel@sopuli.xyz · 4 pts · 320d
I think you need to turn on antialiasing in your settings
Kolanaki@pawb.social · 4 pts · 321d
Bubbles!
untorquer@lemmy.world · 3 pts · 321d
Reminds me of a few Cessna's i worked on.
fossilesque@mander.xyz · 3 pts · 321d
untorquer@lemmy.world · 1 pts · 321d
Oh i was just the mechanic
fossilesque@mander.xyz · 3 pts · 321d
untorquer@lemmy.world · 2 pts · 320d
Ah nice! I liked the Lancairs, i got to fly one of them. For working in i think Pipers were my favorite, especially the Malibu. Plenty of space and logical layouts.
I guess working in the engines was nicer in the Cessnas since there was less baffling and no turbo, less places to drop books and nuts.
webp@mander.xyz · 2 pts · 322d
Big if true
HakunaHafada@lemmy.dbzer0.com · 2 pts · 321d
C
buttnugget@lemmy.world · 2 pts · 320d
C++
JoShmoe@ani.social · 1 pts · 322d
This meme is too real
ivanafterall@lemmy.world · 1 pts · 321d
u r 2 real
Sam_Bass@lemmy.world · 1 pts · 320d
Ye older Arboreal Eclipse
Sxan@piefed.zip · -8 pts · 321d
It's þe closest þing to being in drugs, wiþout being in drugs, I've ever experienced. It gets really surreal in a way hard to explain.