That system may not always be safe for the poor old sensor. A camera with a shutter and mechanical aperture stop will limit the possible damage to a sensor but phones don't have that. Otoh, the lens is small so perhaps the power flux is safe. Not like an f1.7 50mm SLR lens!Using that same smart idea I used my phone as protection etc. to view the recent solar eclipse. So, here's one more: Solar [Eclipse] Glasses ...
[It worked + taking pictures too ...]
I just put the camera in 'Auto'. As far as I know it's safe. I've never seen any damage on any phone with that, and I take pictures with sun on the back or center all the time (& with a variety of phones) ...That system may not always be safe for the poor old sensor. A camera with a shutter and mechanical aperture stop will limit the possible damage to a sensor but phones don't have that. Otoh, the lens is small so perhaps the power flux is safe. Not like an f1.7 50mm SLR lens!
I don't think that would help because the sensor is not covered by a mechanical shutter. It has to be because the lens is so tiny - a fraction of the power going in, compared with a big camera.I just put the camera in 'Auto'.
(Sorry for the delay in replying) I'm not very familiar how phone cameras and sensors work (you probably know more), just out of practice.I don't think that would help because the sensor is not covered by a mechanical shutter. It has to be because the lens is so tiny - a fraction of the power going in, compared with a big camera.
Yep, I remember that solar imaging item. The problem with solar photos is that, for anything other than very basic images, you need a very narrow band Hydrogen Alpha filter which involves an etalon and lots of money. Sunspots are doable though, if you can force a much reduced exposure value.
Clearly it's not a problem cos we can see it working and not for the first time on the video. But the flux density from the arc, viewed from a distance of a few tens of cm will probably be less than the Solar constant, anyway. A bigger risk is to get some molten steel droplet landing on the lens. A glass / plastic screen would probably be a good idea. Those spatters get everywhere - hands, clothes and anything else on the bench.How much of what you say also becomes a problem too though in the original welding helmet idea? ...
It makes senseClearly it's not a problem cos we can see it working and not for the first time on the video. But the flux density from the arc, viewed from a distance of a few tens of cm will probably be less than the Solar constant, anyway. A bigger risk is to get some molten steel droplet landing on the lens. A glass / plastic screen would probably be a good idea. Those spatters get everywhere - hands, clothes and anything else on the bench.
The whole notion of a civilised war is paradoxical. The 'rules' of war have always been crazy - like the initial ban on using crossbows to kill christians, because the injuries were so horrific. Civilians are very vulnerable because they don't make the rules of the time.Below are the plus and minus sides of the same news item.
Concur. The ban on crossbows during warfare refers to publications by Pope Innocent II before his papacy while representing the Catholic church at the Concordat of Worms and later as disputed pope. Crossbow bolts produced injuries consistent with other war weapons at that time but extended the carnage to knights wearing armor.The whole notion of a civilised war is paradoxical. The 'rules' of war have always been crazy - like the initial ban on using crossbows to kill christians, because the injuries were so horrific. Civilians are very vulnerable because they don't make the rules of the time.
Here is not a strictly mathematical relationship but if I spend $100 for a mobile devise, it better last no less than 5 years. If I spend $300 then it better last 13 to 16 years.We always forget the brick when you can no longer charge it or it no longer gets updates because its obsolete.