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Messages - Lawliet

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31
Canon General / Re: Interview With Canon Executives
« on: March 06, 2014, 12:58:49 AM »

Along those lines, I'm really looking forward to the implementation of single shot HDR. If you could use digital curtains and pack 1/125, 1/500, and 1/2000 exposures into a single 1/60 shot, then you'd have a hand holdable (for most lenses) single click method of producing HDR images.
It doesn't sound that complicated to implement, does anyone know of a camera that does it already?

I'd go so far as to make use of the dual pixel architecture, just read the diodes with different amplifications, esp as. Canon doesn't have an de facto ISO-free sensor.

32
Reviews / Re: Why the DxO bashing?
« on: February 08, 2014, 11:43:27 PM »

That particular quote comes from Gale Tattersall - the guy that used the 5D Mark II for House where they used the 5D Mark II to shoot the final TV episode. So what you're now saying is that a well respected professional is wrong?

Do you realize that G.T. is in the motion picture business?
I.E., esp. given the time frame of the statement, thats comparing of what remains after the cameras internal conversation, the lossy compression and then the color grading on top of that are applied vs. raw sensor data?

33
Canon General / Re: Review: Canon Speedlite Transmitter ST-E3-RT
« on: January 31, 2014, 09:17:46 AM »

Is the transmission distance any better between the Yongnuo and the Canon?
One thing to keep in mind: the RT system is based on a two way communication. No matter how much power you put out, if the response from the flash doesn't reach you you're out of luck. I.e.  getting more range then between two 600EX-RT is unlikely, and I'm not aware of noticable range differences between a 600EX-RT and the ST-E3 as transmitters.

34

Thanks for the explanation.  However, I wonder if the physical infrastructure needed to perform a global shutter wouldn't have implications for still photography.  A rolling shutter seems to be the necessary result of having slower processers/read rates (I could be wrong).  To pull off a global shutter I would expect you would need faster or more A/D processors and faster read rates.  I wonder if such hardware could benefit still photography in terms of fps and possibly (elephant in the room) noise.

Or you do it old school, with secondary buckets. Give each sensel the capability to put its current charge in a non photosensitve area. Then you have all the time you want to sample. Another option would involve a Kerr- or Pockels-effect based shutter.
But Canon wants more readouts anyway - DPPD-AF makes you want to potentially read the whole sensor*2 at the refresh rate of the current PDAF-sensors (and prcess that data).
Well, Sonys high end compact can read,process and compress to video 60 iirc 20MP-images per second, a similar core in a dual configuration could do quite a lot... 8)

35
[
If one values dynamic range and cutting edge sensor technology, it's pretty clear who the leader is now.
How many clients care about the sensor technology used? The closest I've been asked was "MF or small frame". In focus or not is also much higher on the priority, esp in sports, then some noise in pushed shadows, cue the colorblind AF in the Nikons and the red (induced) shift.

36
VERY interesting. Something has to happen in the Canon camp!

That depends on what the D4s can do - if it just narrows the gap the pressure is more on emotional side. Even a slight edge wouldn't have much impact. And seriously surpassing the 1Dx would warrent a promotion to D5. not just the incremental s. As for video: 1080p@60 would be expected, but the 1Dc can do that too - it would require 4K with RGB readout and at a decent framerate to get folks seriously interested.
I'd say the D800 is a stronger "something has to happen"-factor ;)

37
EOS Bodies / Re: Canon EOS-A1 with Hybrid EVF? [CR1]
« on: December 21, 2013, 08:30:35 PM »
What if in the future, they produce that prototype camera that is able to shoot 24, 30, 60 and/or 120fps, and its 100MP with Native ISOs of 1600?


That camera would require sensor cells about 16times of the current ones. At the same time you have about 4 times the cells. I.e. each side is sqrt(16)*sqrt(4)=8 times as long, we're talking about a sensor the size of a large format film/plates and lenses large enough to cover it. To have a real light collecting advantage said lenses would have to be faster then the current ones, while DOF gets thin as a razorblade. They used f/64 for a reason.  There might be practical problems with that.
NB: The QE of current silicon doesn't allow for much higher sensitivity as we're already close to counting single photons. Unless we're getting more photons we're de facto stuck.

38
EOS Bodies / Re: Canon EOS-A1 with Hybrid EVF? [CR1]
« on: December 21, 2013, 07:01:07 PM »

By the way, the haters of video... remember the C100 has a native ISO of 850.
Imagine what you can do as photographer with a Native ISO of 850 and 21 MP. Just saying.

It also gives you just 2MP - about 8 times the sensitive area per pixel. So much for magic photomultiplication due to video.

39
Lighting / Re: ST-E3 RT + 600EX RT + 430EX II??
« on: December 20, 2013, 08:41:43 PM »
Can I mount the ST-E3 RT to my 5DIII and fire the 600EX RT via radio while having the 600 trigger the 430EX II optically?

Would be nice, but thats not on the menu. :(
Canons remote flash system is either Radio only or optically only.

40
EOS Bodies / Re: Canon Dual-Scale Column-Parallel ADC Patent
« on: December 20, 2013, 07:26:12 PM »

I am still not entirely certain I understand what the purpose of this is.
Quote

It has two implications.  At ~64K e full well capacity and 16k/14bit resulution you get away with 4e steps for sampling. In the same timeframe you can sample the low quartille at 1e Resolution, cutting the shadow noise by a good margin. Engineering details have impact on the actual numbers...
The other one: the comperators change the signal sent from the sensor to the Digics from charge to time. Some stray electrons pushed around by environmental EM are less likely to change the value read.

From what I understand about Canon noise in their current setup, the high frequency ADC in their DIGIC chips is a significant source of banding noise. I've assumed that this patent, by increasing the accuracy if ADC, would reduce that noise, thereby allowing a gain in DR.
One prong gets us closer to the single electron counting/ISO-less readout, at least for pulling up shadows. No benefit for recovering blown out Highlights or spreading the midtones. We need some margins for whining I guess. ;)
The other should shift the main cause of banding from analog amplification and transmission to accuracy of Timing. The latter is much easier to handle, something at the clock rate of parts of current CPUs would do the trick. Good news: "normal" clock instabilities cause only a marginal drift of effective ISO, but at the same rate for all channels.

Question to be answered: how noise free are the comperators and their infrastructure?

41
EOS Bodies / Re: Canon Dual-Scale Column-Parallel ADC Patent
« on: December 20, 2013, 03:40:56 PM »

Thank you for the explanation! I got the gist of it, but I still don't understand the basics: how is it possible to read the same pixel twice simultaneously? I thought you can't eat your cake and have it too :)? I mean, wouldn't the signal become weaker if you split it?

The patent looks like a ramp ADC - they don't take the electrons out to count them, but use a voltage comparison. The unknown pile of e- on the right, you measure how long you have to add charge on the left side until both are equal(or the known one grows larger then the unknown). In theory nothing stops you from using multiple heaps that grow at different rates. You just have to keep crosstalk, external influences and such under control.

42
EOS Bodies / Re: Thinking Out Loud: EOS 7D Mark II Thoughts
« on: December 19, 2013, 06:29:33 PM »

As for readout rate, they aren't reading the entire sensor at 60fps. Video reads are different than full frame stills reads. You only need to read two megapixels for full HD video. If they actually WERE reading the full frame at 60fps, that would mean the data throughput rate was TWO GIGABYTES PER SECOND. The DIGIC5+ is only capable of 250 MEGABYTES per second each (and the 1D X needs 480MB throughput to support 14fps, hence the use of dual digic.) Conversely, at 2 megapixels, the total throughput rate for 1080p readout at 60fps is 218MB/s, and is very likely achieved via some kind of basic hardware binning at best, and row skipping at worst.

Thats where we should look at Sonys RX10 - it archives video quality on par with the much bigger solutions by actually reading (and using the data of) its full sensor @60p. Using similar readout &  processing cores on each the left&right half of a full frame sensor would get you very close to 4K 4:4:4 (i.e. 7680/8192px on the long side) @60p. Or really high fps for 39/45MP stills. You might need a bigger body to fit everything in...but that could be considered a bonus after all :)

43
EOS Bodies / Re: Thinking Out Loud: EOS 7D Mark II Thoughts
« on: December 15, 2013, 02:06:03 PM »
If you think APS-C is superior in other ways, you're deluding yourself.

At least if you have an EVF and electronic shutter.
Otherwise you introduce guesswork or a mostly masked out OVF as costs for the reduced workload of partial readout and the curtains still have to travel the whole height of the sensor. Canon isn't exactly doing much in that regard though.

44
It would piss me off more if all they did to the next 1Dx was to add a dual pixel sensor.  I mean, you can send in your canon Video camera (C-100 I believe) to have it upgraded, they should offer that option to 1Dx owners as well.

That might not be that easy - the C100/300 use a 8MP sensor to record a 2MP image - without a Bayer-matrix you end up with 6MP aquiring the cleanest HD signal possible while 2MP do nothing. The latter could simply have gotten the half shaded microlenses everybody else in the industry is using.
You'd have to turn the 1Dx into a 4,5MP Foveon-alike, I don't see that much of an audience for that. Esp. considering the C100's price.

45
EOS Bodies / Re: Just Touching the Surface of Dual Pixel Technology? [CR1]
« on: November 26, 2013, 02:57:24 PM »

I wouldn't have thought 1/3 of a stop would make that much of a difference...
With fast triggers its 2/3 of a stop, or a full one if you allow for the same amount of shading, difference(there is a reason the manuals are quite YMMV in that regard), I.E. twice the number of packs, no more lightweight heads, but bitubes that each cost not much less then a 1Dx. Or a D800&a nice set of lenses.
Enough difference to put it rather high on my priority list.

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