41mp mobile phone camera

[gregbradley]

Are we going to be using our mobile phones for astrophotography in the foreseeable future?

Hows about a 41mp Nokia just released?

http://techcircle.vccircle.com/500/s...s-2012-part-i/

I have seen adapters so you can fit your DSLR lenses on an iphone.

I guess it wouldn't need a heavy mount!

Greg.

[Octane (Humayun)]

There's an archive.zip floating about which has some insanely good images taken by that camera.

The thing to note, though, is that they're all taken in good light.

It would be interesting to see how it performs under low light.

Still, having said that, what a remarkable achievement!

H

[Terry B]

Originally Posted by Octane

There's an archive.zip floating about which has some insanely good images taken by that camera.

The thing to note, though, is that they're all taken in good light.

It would be interesting to see how it performs under low light.

Still, having said that, what a remarkable achievement!

H

Big numbers. What size are the pixels? ?1 um.

[Barrykgerdes]

In a 16:9 format that's 8500 pixels wide on a small(?) chip. But if they are standard size that's a BIG chip.

Won't display full size raw on my computer.

Barry

[g__day (Matthew)]

I know from experience in the past Sony Ericcson phones seem to have the best lens with a very decent chip, so they always seem to take the best shots when you zoom in on them. They are more like a camera with a smart phone attached...

[gregbradley]

I read elsewhere the camera bins the 8 nearby pixels to make a much smaller image.

I suppose this would lift the low light performance but who knows how it would go in that regard. A simple iphone performs reasonably in low light.

Greg.

[Barrykgerdes]

If you bin 8 pixels that is still a good size image

Barry

[rally]

Certainly an interesting device.
Its even got Dolby surround sound.

Some details sensor details
http://3.bp.blogspot.com/-8DfIcdMmnW...808+Sensor.JPG

Lens Focal length - 8.02mm
Lens - 5 aspheric elements
Mechanical shutter with Neutral density filter
Lens f ratio - f2.4 - you actually get some depth of field !
Sensor is 1 x 1.2" - pretty huge for this sort of device
1.4uM pixels
2 Aspect ratios - 7728 x 4354 pixels for 16:9 images/videos, or 7152 x 5368 pixels for 4:3

I am not entirely sure what they are doing, but it seems as if they are always oversampling and also cropping to achieve zoom and in order to get the noise levels down - I think that means you never actually get the full 41mp ?

[Barrykgerdes]

Originally Posted by rally

1.4uM pixels
2 Aspect ratios - 7728 x 4354 pixels for 16:9 images/videos, or 7152 x 5368 pixels for 4:3

I am not entirely sure what they are doing, but it seems as if they are always oversampling and also cropping to achieve zoom and in order to get the noise levels down - I think that means you never actually get the full 41mp ?

At 16:9 the 41Mp is 8537.499 x 4802.343
At 4:3 it is 7393.691 x 5545.268
So there is quite a bit used in overhead. Still it's a big chip

Barry

[rally]

Barry,

Yes, but I think the device will only output a 2, 3, 5 or 8mp image. (not including all the video formats)
It uses all the pixels in whichever preferred aspect ratio you want use (all width or all height) to oversample to produce those images.

The zooming feature - both optical and digital, crops and resamples the entire imaged area to provide a "lossless" result.

But what I have read doesn't fully explain it - so that could be all wrong !

I also dont understand the claim about a Bayer free image, but again that may have to do with the resampling methodology. The claim that all pixels actually have full RGB information may have to do with the fact that one final image pixel (of a 2-8mp image) is really a fully resampled version of many individual RGB pixels from the original possible 41mp.

[gregbradley]

I am sure that is what they mean. The only sensor which is colour that has rgb info in each pixel is the Foveon sensor which is featured in Sigma cameras.

They have a new sensor out which is effective 46mp as well. Its 15mp but each site reads rgb from different depths in the silicone chip.

No anti aliasing filter either. I believe low light performance is not so great and they seem to be noisy from what few images I have seen. High light images though are impressive. Sigma camera bodies are not in the same league as Canon or Nikon though.

Greg.