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Posts: 2,050 | Thanked: 1,425 times | Joined on Dec 2009 @ Bucharest
#36
Originally Posted by giannoug View Post
Can you post some photos taken by the burnt CCD?
It would be a green, full, image with black taints as the sensor darkens. You can't capture what is beyond sensor ability. It might even be some other colors, if the software never expected to see over-unity light.

Originally Posted by MaxJP View Post
Hmm... So Nokia can replace the whole camera for me? Or they just replace the burnt lens?
It's not the lens that's burned, it's the sensor. Anyway, the whole module is easily dismantled and replaced. If you find them free they can do it on the spot in about 5 minutes.

Not incredibly expensive, though I would make the dolt pay for me. In fact, I'd take it to Nokia right now, pay them, then present him with the bill. Ask Nokia to specify "darkened camera sensor" as to not have a dispute later.

If you don't he'll never learn. Next time you'll hear "hey, there's this trick I found".

Originally Posted by lcuk View Post
hmmm you are right...
now, how FAST do you have to read to decode normal TV remotes?
can it be done with a suitably low resolution image perhaps...
Most remotes are quite slow by communication standards, sometimes operating as low as 300 baud, sometimes 4800 on high-end remotes.

On a camera, that's 300 to 5000 FPS, way, way beyond the capabilities of the camera.

Remember, you capture 15 million samples (5 for each color component) from 0 to 256, that translates into 15 MB, or 120 Mega bits per frame. Multiply that by 25 or 30 and you have an impressive amount of data - it requires specialized hardware.

Meantime, a remote receiver only captures 1 bit every "tick", a grand total of 300 bits for low-end (sometimes lower), that's 40 bytes. I've seen remotes as low as 12.

So, no. But if you really wanted to receive a remote, the IR port could help. If not, an adapter isn't very complicated, and with the USB OTG that's being cooked as we speak you could use a USB-RS232 adapter and simply get codes in the terminal.

Note, however, that under 10$ there are several ways to read them on a PC, maybe send the codes over.

Originally Posted by Renkon View Post
That goes for DSLRs vs direct sunlight focus, too.
Depends on DSLR, on focus, etc. However, remember that a nice DSLR has a 55 or 60 mm lens that gets focused on a 16x24 mm sensor (APS-C). That's a ratio of 3:1 or (let's make it interesting) 4:1. (less for full-frame, even less for telephoto)

Sun delivers about 3000W per sq m. That's 3000W/1,000,000 sq mm, or 3 mW per sq mm.

A red pointer is little danger at 5 mW, but a green pointer goes from about 10 (very, very low), to 50mW (medium) to 300 mW(strong). The beam completely fits the lens if it's any good.

A generic camera sensor is 4x3 mm, or 12 mm (if you're lucky). That delivers an average of 3W per sq mm, with a very rough rounding.

So, a strong laser pointer in an N900 delivers about 1000 times the power of a DSLR in the sun.

You shouldn't _leave_ a DSLR in the sun, as there is no ventilation and it WILL go kaboom. There is no danger in taking shots upwards, as long as you don't take forever.

Originally Posted by AtteK0 View Post
BTW powerful lasers are really dangerous. Most of them probably illegal if used in public.

What could have happened to a retina if a camera is burned by that green laser?
Lasers above 5 mW are illegal in most of the world.

The blink reflex kicks in at about 2.5 mW(max), that's why the 2mW and 5mW pointers are legal to use, annoying as they might be. The blink reflex kicks in and blinks a few milliseconds after exposure, so under about 5 mW not enough damage is done, that's why the signs say "do no STARE into beam". This assumes, of course, that you are sober, you see the light (don't laugh, it's not hard to make an IR laser) and, of course, you are not adverse to temporary damage.

Note, however, that there is no way to know if some idiot didn't overvolt, replace, upgrade the diode or optics, so the general safety rule is: if someone points a laser close to your eyes, punch them. 5 seconds of fun do not balance out a life of decreased visual acuity and depth perception.

And finally, the sensor is a CMOS, not a CCD. Just sayin'.
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