Most cameras have an IR Cut filter which acts to block IR light from the camera. This prevents IR light from flooding the sensor giving the image a red hue.
For astro photography IR light is useful. Hydrogen gas in nebulas can emit IR light. The human eye can't see it, but the camera sensor (without the IR Cut filter) can, and will be sensed as red light.
If one adds a visible light filter to the front of the camera, then the camera can take images of IR spectrum only.
Nikon and Canon both sell cameras without the IR Cut filter. Also third parties have been able to remove the IR Cut filter on existing camera bodies.
I did the same too, but funnily enough I stumbled upon it by accident when I was trying to find things that pass IR through but not visible light (like coke, sunglasses, ink etc.) using my Sony camera with nightvision mode. I was on a quest to get "x-ray vision".
I have one where I just removed the filter and added some IR led's for my 3d printer cam, that way I don't need visible light and the room can stay dark if I need it to be.
Phone cameras can often see into the IR spectrum, but by now most of them are able to deal with that properly to make the images look normal. I remember some 3MPix phone camera from like 2008 that created strong purple coloring for example with camp fires, especially if you took images of the embers (also with BBQs if done with charcoal). Just hold an IR remote and press a button on it and see if your phone sees the IR LED light up. My current smartphone sees it clearly. No idea how far into IR the A7s sensor without the IR filter goes; with IR filter it barely registers my IR remote (I have an unmodified A7s). It also depends on the glass/lens.
You can also buy Raspberry Pi cameras in the "NoIR" version that comes without the short pass filter, or do an easy DIY conversion in the case of the RPi HQ camera.
Shout out to the photographer who shot this. Lots of preparation going into something that was there for only a few seconds (and might not have shown up at all).
I wonder how many times they tried and failed to get the shot before. Assuming they had to try several times, good for them for sticking with it.
Yes, but typically the camera is not set to 51,200 ISO. I can't browse Instagram or Facebook without an account, and I can't figure out how to navigate his website, so I don't know how to check.
It is an A7s. Released in mid 2014, 12MPix resolution at FullFrame (36x24mm), FSI (front side illuminated), so large and very sensitive pixels. ISOs can be ramped up to 400k, but from my experience ISO 50k is about the limit if you want to avoid the image quality dropping through the floor. So this setting actually makes a lot of sense if you have to deal with video at these light levels.
Physical explanation: “One bolt was so strong, it generated an intense electromagnetic pulse (EMP). The red ring marks the spot where the EMP hit Earth’s ionosphere. Normal lightning bolts carry 10 to 30 kilo-ampères of current; this bolt was about 10 times stronger than normal.”
> "TGFs [terrestrial gamma-ray flashes] have been associated with lightning strikes and may be related to red sprites and blue jets, side effects of thunderstorms that occur in the upper atmosphere and are typically only visible with high-altitude aircraft and satellites. The exact relationship between all these events is still unclear, though."
Clearly the work of Jupiter. In all seriousness, this is the kind of thing that I imagine would have have been seen by the ancient Italians/Romans as the work of Jupiter or another one of the gods.
If you go by that acronym, the singular form of ELVES should be also ELVES, not ELVE, as in the article (plus using ELVE destroys a perfectly good acronym, because the singular form of Elves is Elf).
You can't imagine my frustration at the thought of everyone debating a circle of red light that I am unable to see. It's a pain in the ass to be colorblind.
It being so high up in the ionosphere makes it difficult to comprehend the size and distance of the ring. Visually, it's hard to gauge its position, both vertically and latitudinally.
> Therefore, unlike sprites, which, on rare occasions can be seen by the naked eye, elves cannot. If one could see an elf, it would probably look like a giant, expanding ring—about 300 miles across--emanating from a point 60-65 miles in altitude and expanding outward
> “With normal cameras, they are difficult to photograph,” he says. “The light they emit is very low and in the infrared where the sensors cannot see. I use a camera without the normal IR Cut filter so it also sees the infrared band well.”
Fails to mention that the human eye can only see visible light waves. Infrared light has longer wavelengths and lower energy than visible light and cannot be seen with the human eye.
And in it is a Portal Dasher who is just zipping down to pick up a pizza for his hungry alien bros whose craft is cloaked in a geostationary orbit. They have the sad assignment to monitor and report home on the state of our technology down here. So far they continue to love the pizza from Italy, the BBQ brisket or ribs from Texas or Mississippi, anything from a food stand in Thailand or Vietnam, and they avoid the Swedish surstromming because the first and only time they tried it they had a hard time getting that smell out of their craft.
Still, it is a rare event and he had a camera without the IR filter set up to capture this particular phenomenon. So, either a lot of luck or a lot of dedication.
I remember taking apart an Xbox with RRoD to find that all the solders had disintegrated. Reflowing may have helped but I just sold it to GameStop instead
The simulation runners got angry with the banning of ChatGPT in Italy as it risks diverting from the most fun universe-simulation mainline and have started to send signals to get us back on track.
If I recall, the theory was that wrapping your 360 in a towel and turning it on would heat it up so much that whatever microfractures in solder joints that may have been causing the RROD problem would temporarily bond together again and make your Xbox usable for a time.
It issue was with brittle solder on the boards and wrapping it in a towel and turning it on would allow it to get hot enough to (hopefully) re-flow broken connections.
