December 18, 2014, 02:36:18 AM

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Messages - pedro

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1
EOS Bodies / Re: Patent: Sensor Technology
« on: November 29, 2014, 11:30:09 AM »
oh yes I can imagine ;-) maybe there is anybody out there who dominates japanese, or who knows how to transform these phrases into something like english...;-) cheers, Pedro

2
EOS Bodies / Re: Patent: Sensor Technology
« on: November 29, 2014, 11:06:59 AM »
what I could get out of it from the link provided filtering the japanese signs through babylon translater:
A patent to extend dynamic range in the pixel that Canon transmissivity is different[a semiconductor / electronics technology]
Canon HDR Explanation / the self-interpretation of the patent document Patent public number 2014-175,553 A Pub. Date2014.9.22 An application date2013.3.11 A patent of Canon A light decrement film by the poly-silicon arranges it on photoelectric conversion department The light decrement film is different in transmissivity of the light depending on the thickness, and the thickness is different by a pixel The small pixel of the transmissivity has a small opening area A color filter of RGB either The transmissivity is R<G<B A patent of Canon That sensitivity is different by a pixel isn't the thing that various makers are rare of patent application. About a method to let sensitivity be different, various patent application will be considered to be it to evade a patent. For example, a certain maker is applying for the patent of the different ND filter of the transmissivity. Then I seem to have established the light decrement film by the poly-silicon between a filter and photodiode when it was said what the patent application of Canon was different in. Because many makers are interested in technology to let the sensitivity of the pixel be different, manufacture is expected.

4
The technology of image sensors is ripe, and we should expect small improvements. Something like 1/3 stop better seems quite realistic.
If Canon does not change their overall architecture, I agree...1/3rd stop at best. The A7s is an indication of what's possible, and it's more than two stops better than the 1D X at ISO 51200.  If Canon improves their overall architecture, I really hope we see at least a 2-stop improvement across the board, low and high ISO.
You say 2 whole stops of noise at high ISO? :o
Are you sure you were not talking about 2 stops of DR? ???


DR, lower noise. Same thing. We're primarily talking photon shot noise here. Assuming you have a perfect system...one that does not introduce any read noise, then more dynamic range or lower photon shot noise, there is no difference. It's the same thing, because dynamic range is the ratio between the maximum signal power and noise level. Read noise is just additive with photon shot noise, so it's the same thing in the end...lower noise, higher DR...same thing.


Keep in mind...noise is a random, undesired deviation from the proper, correct sample value. It's a range itself, +/- X, around the correct signal value. At higher signal power, that +/- X becomes less significant, so at higher ISO, increasing your maximum signal power becomes increasingly important. This has nothing to do with shadow pushing anymore...it has to do with overall signal quality. This is why pixel size becomes increasingly important at very high ISO settings, where as it is not really important at all at low ISO settings...at low ISO settings, there is (usually, assuming you expose properly) plenty of light, and it's read noise that becomes the most dominant source of noise. Bigger pixels gather more light, it's basically real-time averaging, like downsampling an image, only at the time the image is created.


At higher ISO settings, read noise drops to effectively imperceptible levels. Once your at ~3e- or lower, read noise is pretty trivial (so if you start out at 3e- at base ISO, like the D810, your doing really freaking good!) Photon shot noise completely dominates, and the weaker the signal, the more dominant noise will be. That is where the A7s pulls ahead of everything else right now for overall signal performance across all ISO settings. It has great low ISO DR (not the best, but excellent, at 12.9 stops), but it has the signal strength at high ISO to produce better images. It's got a maximum saturation (signal strength) of 323e- at ISO 51200, paired with a phenomenal read noise level of 0.7e-. In contrast, the 1D X has a max. sat. of 163e- at ISO 51200, paired with a still great, but still more DR-diminishing than the A7s, read noise level of 1.7e-. The A7s has twice the signal power and less than half the read noise. Ignoring the read noise entirely...you still have twice the signal strength, which in and of itself is a full stop improvement.


Also keep in mind, noise levels are additive. The 0.7e-/1.7e- RN levels are primarily additive with photon shot noise, and with the signal itself...so again, those read noise levels affect the whole signal, not just the shadows.


So, it doesn't matter what you call it, really. Lower noise, higher DR...same difference. It all means a better image in the end.

Thank you jrista for this detailled explanation! Will we ever come as close to such a great high ISO IQ as Sony demonstrates it, at the same or a similar price tag by Canon? I kinda doubt that, I guess they will ask another premium for that same thing... Sometimes I am pondering about purchasing a Sony A7s for the lowlight pics and keep with the 5D3 for the rest...

5
EOS Bodies / Re: Modular DSLR Coming from Canon? [CR2]
« on: October 29, 2014, 02:25:04 PM »
Can't really speak too much about modular components, but I'd love to see a video-focused cinema DSLR camera with something in the ballpark of:

• $3k - $4k price range
• Full frame sensor ~12mp
• DPAF
• Tilt touch screen
• EVF
• 1080p 60fps (4K would be nice, but probably not going to happen)
• MPEG2/AVCHD codec options
• Clean 4:2:2 out (again, 10 bit would be nice but probably not happening at sub $4k)
• No time recording limit
• Focus peaking/zebras
• 19 point all cross type auto focus
• ISO range 100-51,200 (expandable to 50-204,800)
• Smooth ISO ramping auto-exposure like the Nikon D810
• Mic input with dedicated gain knob
• Headphone output
• Built-in WiFi


In my dreams... I know :P

What would you guys like to see in a DSLR cinema camera that would win you over more than the 1Dc?

If this was for real, I'd compose my 4 fps, 12 MP high ISO monster...;-) at 4K...wow...

On another note: is there any relation to this recent thread?
   
If Canon made a " truly ultimate" DSLR body for, say, $10k would you buy it?  New
Started by LovePhotography « 1 2 3 ... 5 »

6
EOS Bodies / Re: If the sensor is Medium Format - maybe.
« on: October 28, 2014, 02:21:15 PM »
$5k is my max limit for any 35mm format camera body.
very wise move rick. mine is a 5D. Paid the premium 3.5k in August 2012, but I wanted to make those photographs at ISO 6400 which my trusty 30D couldn't do ;-) 3.5K to 4K max. And next time: i'll bite the bullet the year after release... As my only interest is better high ISOs. Regards, Peter

7
Are you, BTW, doing some sort of undercover Marketing Research for Canon? Don't take it personal, just came to my mind ;-)

8
okay. whatever improvement in high ISO will be fine. As incremental as it might be.

9
Note: I might have started a similar thread on this topic quite some moons ago. I am a no tech guy who is not familiar with the common technical terms and funcionality descriptions. Anyway, according to the last months and announcements, what is feasable in the high ISO IQ above 25k quality wise concerning the last evoluationary steps by Canon?
Sensorarchitecture surely will be a crucial if not essential component along with pixel count, etc. Hope it remains in the low 20s e.g. 24 MP max.
Thank you for any prognostical note from our technically more advanced fora participants!
Regards, Peter.

10
EOS Bodies / Re: Multilayer Sensors are Coming From Canon [CR2]
« on: October 08, 2014, 07:31:50 PM »
Looking forward to more information...good hints...meanwhile my 5D3 still rocks.

11
Canon General / Re: seeimpossible.usa.canon.com?
« on: October 06, 2014, 06:25:31 AM »
Announcement reminds me of the sensor they announced in development last year that could shoot in 0.01 lux... They had a video of firefly's shot in near pitch black.
So perhaps a new camera great in low light?

Same thing came to my mind.

It's here
http://www.canon.com/news/2013/sep12e.html

If it turns out in a development announcement of a new canon dslr body, the 1DxII maybe won't be that far off anymore...

12
EOS Bodies - For Stills / Re: Long exposure questions on 5D MK3
« on: October 05, 2014, 01:38:37 PM »
Thank you Neuro, for your expertise and sound advice.

13
EOS Bodies - For Stills / Re: Long exposure questions on 5D MK3
« on: October 05, 2014, 11:37:16 AM »
High ISO NR is not applied to RAW files, nor is ALO.  Long exposure NR is applied to RAW, with that setting the camera takes a dark frame after the exposure (a 40 s exposure means a 40 s dark frame), then subtracts the dark frame before writing the RAW file.  That effectively removes hot pixels, but it can actually add random noise. 

I'd turn IS off to save battery power during long exposure shooting.

Well, that is an intresting statement, Neuro. In my 5DIII Long exposure NR is set on automatic mode. As I do lots of night shots, would you recommend to switch it off? Thanks for your creative input on this.

14
EOS Bodies / Re: 5D Mark IV announcement on March 2015 or later
« on: September 15, 2014, 07:26:00 PM »
I won't be in the game for a 5DIV, as my 5D3 still does a great allrounder job (mostly moonless nightscapes and few events), but I surely am looking forward to what extent low light IQ will be improved within the next body cycle. Hope they keep the MPs in the low 20s, couldn't care less for more pixels. As for an allrounder cam, they could even lower the MP count to 20.2 MP like the 6D...

15
EOS Bodies / Re: Official: Canon EOS 7D Mark II
« on: September 15, 2014, 10:31:42 AM »
Given the time left, if should be ready for Christmas sales...they won't deprive themselves from high sale rates due to the seasonal rush for presents...this time, it requires differently sized stockings for daddy...;-)

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