November 26, 2014, 02:45:50 AM

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Messages - BozillaNZ

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EOS Bodies / Re: I killed my brand new 7D MK2 today
« on: November 13, 2014, 10:30:42 PM »
"I killed my brand new 7D II today --- with a hammer!"

There are only two things which are infinite: The universe and human stupidity, and I'm not sure about the former... says Albert-who?

EOS Bodies / Re: Canon Announces the Cinema EOS C100 Mark II
« on: October 21, 2014, 08:15:08 PM »
Does it have 4K recording?
How many stops of usable sensor DR?

Please at least let us see a glimpse of hope that you will up in the sensor game? If it's the same 11-bit sensor they can go to hell.

EOS Bodies / Re: Canon Announces CN20x50 Cine-Servo Ultra Zoom Lens
« on: October 16, 2014, 02:58:44 PM »
Why us mere mortals have to care about this?!

And does it increase the DR of their cine cameras? BOOOOO!!!!!! ::) ::)

EOS Bodies / Re: 7D MkII RAW sample images
« on: October 15, 2014, 10:20:49 PM »
It's the same 11-bit DR sensor, nothing to see here, move along.

EOS Bodies / Re: EOS 6D Mark II to Move Upmarket? [CR1]
« on: October 15, 2014, 10:11:01 PM »
I think people need to take their brand-glasses off if they can't see how the 6D was intentionally crippled.

Exactly, if they didn't put the old ass 1 cross point AF in 6D, the sales wouldn't be so bad. Even the AF from 600D where you can rely on a outer cross point is far better.

Canon should learn from Nikon in this aspect. Put the 61-pt AF on next 6D and 65-pt all cross AF on next 5D, you will sell more and there is nothing to cannibalize.

If next round of FF from Canon still has the lame 11-bit DR sensors and 11-pt AF for entry models, consider me a goner. My faith in Canon is at 15% now.

EOS Bodies / Re: Canon profit report
« on: October 14, 2014, 09:50:56 PM »
No new sensor == no sale for me.

I'm gonna hang on to my old trusty 1Ds2 and 1Ds3 pair until Canon comes out with a true next gen sensor, or till my patience run out and dump em all.

Reviews / Re: Product Review – Nikon D810 vs Canon Mark III
« on: October 14, 2014, 09:45:35 PM »
Wow, if the dude in the video was a foot taller, he'd look like a clone of one of my photography instructors.

If he was 10 times smarter he would be Einstein.  ???

Reviews / Re: Product Review – Nikon D810 vs Canon Mark III
« on: October 14, 2014, 08:39:04 PM »
Meh, another DR war...

Reviews / Re: Tony Northrup - D810 vs. 5D Mk3
« on: October 14, 2014, 08:38:07 PM »
Meh, another DR war...

Third Party Manufacturers / Re: Nikon 750D real world review
« on: October 14, 2014, 08:26:06 PM »
Meh, another DR war...

Reviews / Re: Canon EOS 7D MK II Field Review of THE APS-C DSLR KING .
« on: October 13, 2014, 09:34:49 PM »
Chuck Norris can punch a DSLR between the, em... lenses!  >:(

Too late, my money is already determined to go to the Panasonic LX100

EOS Bodies / Re: Multilayer Sensors are Coming From Canon [CR2]
« on: October 09, 2014, 01:16:52 AM »
The kicker is, you can take the 14-bit samples,scale up to 16-bit, then add 2-bit randomly generated noise and get the indistinguishable (same) result. You can't get something for nothing really.

I' doing a lot of raw data manipulation recently, Canon 12-bit Raw files has the range of 127-3850. Seems pretty low isn't it? But the tonal range and dr of this model (1Ds 2) in DXO is still not much different than newer 14-bit sensors.

EOS Bodies / Re: Multilayer Sensors are Coming From Canon [CR2]
« on: October 09, 2014, 12:22:32 AM »
Think about it. If read noise is 35e-, and the maximum signal strength is 68,000e-. If your doing 16-bit conversion, then your gain is 1.0376e-/ADU . That's almost unity ISO 100! Unity gain is what you want. With 14-bit conversion, your gain is 4.15e-/ADU. So, with 14-bit, your read noise turns into 8-9 tonal levels. With 16-bit, your read noise turns into 33-34 tonal levels. That's the bottom of the signal, though. For 16-bit, you still have 65502 levels for all the signal detail above the noise floor. Any gradients in the image at tones 35 through 65535 are going to be smoother with 16-bit conversion than with 14-bit conversion.

The noise floor does not only 'exist' in the lower-end of the signal range, it exists through-out the range event to the clip point.

Let's do a math exercise:

Here's a stream of signal:
0  10  100  1000  10000  100000

If my sensor has noise floor of 3-bits (0~8), even if I sample it using full precision, I got this:
3  12  107  1004  10002  100005, my lowest 3 bits are drown in noise, even for the highlight.

If I sample it with 1/8 precision (chops off lower 3 bits), I get:
0  1   13   125   1250   12500

Then recreate the signal by multiplying the sample signal by 8 times:
0  8   104  1000  10000  100000

And mix it with random number generator for 3-bits:
5  10  109  1001  10007  100004

The results of high and low precision sampling only fluctuates within noise floor, so are essentially the same.

The conclusion? If you are sampling more precision than your SNR, you are just sampling noise more precisely, which is still noise, and is same as if you don't sample as precise, then add noise in post.

Apply this to your example, when you have 35e- noise floor, your tonal range is not 65535-35 = 65500, but rather 65535/35 = 1872 levels (~10.8 stops), because the bottom 5 (!) bits are unstable noise.

EOS Bodies / Re: Multilayer Sensors are Coming From Canon [CR2]
« on: October 08, 2014, 11:33:46 PM »
I'd say that most FF cameras could benefit from a 16-bit ADC. Even Canon cameras, which still have high read noise, can benefit.

You won't benefit anything by sampling the noise floor 4 times more precise. I could as well read the sensor at 12-bit and fill the lower 4-bits with random noise generator and get a "smoother tonal gradient".

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