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Messages - Lee Jay

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46
EOS Bodies / Re: Are These The EOS 7D Mark II Specifications?
« on: August 22, 2014, 10:26:45 PM »
Yes.  Lets look to the consumer market for inspiration....  compact pixel pitch on a 135 DSLr sensor...  must be in the 100's of MP. yeah. great? right?

Absolutely, it would be great.  I'd kill for that.  Image quality would destroy current DSLR sensors (at high ISO too), and it would act as a built-in optically-perfect teleconverter as well.

47
EOS Bodies / Re: Are These The EOS 7D Mark II Specifications?
« on: August 22, 2014, 10:17:24 PM »
* DxO measures SNR which does NOT directly translate to photographic dynamic range.

DxO measures, but does not directly report, well capacity and SnR.

The method of determining DR from that is shown here:

http://sensorgen.info/Calculations.html

Great. That tells me what I already know. That they are not measuring or reporting photographic DR. And that there are formulas I would have to hunt down or reconstruct in order to verify their results. (Though I suppose that would be possible to do for anyone so inclined.)

Again, DxO DR measurements are nonsense.

"Photographic DR" would likely be less than DR measured this way, for a simple reason - we don't usually tolerate image detail that's near or at the noise floor.

This is measured to the noise floor.

48
EOS Bodies / Re: Are These The EOS 7D Mark II Specifications?
« on: August 22, 2014, 09:27:58 PM »
* DxO measures SNR which does NOT directly translate to photographic dynamic range.

DxO measures, but does not directly report, well capacity and SnR.

The method of determining DR from that is shown here:

http://sensorgen.info/Calculations.html

49
EOS Bodies / Re: Are These The EOS 7D Mark II Specifications?
« on: August 22, 2014, 09:23:09 PM »
In the past, it was said this would have some special video features.  Seems like servo mode for video is something that the 70D already has, at least in part, and 1080p60 is certainly nothing close to "special" as it exists on earlier Canon compacts, so where are the special video features?

50
EOS Bodies / Re: Are These The EOS 7D Mark II Specifications?
« on: August 22, 2014, 08:30:24 PM »
a foveon sensor does not need an AA filter because it does not use a bayer pattern.

Of course a foveon sensor needs an AA filter (unless it's like say maybe 60MP+ APS-C or something).

Wikipedia disagrees  ;D

I was under the impression that the Foveon sensors shipped without AA filters, though I wouldn't swear to it.

They are.  That's part of why they produce lousy images full of artifacts.

51
EOS Bodies / Re: Are These The EOS 7D Mark II Specifications?
« on: August 22, 2014, 04:37:09 PM »
DPAF in the 70D has two photosites for each pixel. I'm really surprised that no one has suggested that "fine detail" is a selectable mode that reads each photosite separately to produce a 40mp image.

If they're both under the same microlens (which is how DPAF works), you wouldn't get any more detail that way.

Totally agree. There is no benefit to splitting the photodiode underneath the same microlens and color filter.

Well, except fot the phase information, which is the whole point of them doing it.

52
EOS Bodies / Re: Are These The EOS 7D Mark II Specifications?
« on: August 22, 2014, 04:36:24 PM »
From these specs it looks like the 7D2 is one stop worse than the 5D3...

At the same framing (when you are focal length limited and cropping anyway), this sensor is likely better than the 5D3.

53
EOS Bodies / Re: Are These The EOS 7D Mark II Specifications?
« on: August 22, 2014, 04:34:01 PM »
DPAF in the 70D has two photosites for each pixel. I'm really surprised that no one has suggested that "fine detail" is a selectable mode that reads each photosite separately to produce a 40mp image.

If they're both under the same microlens (which is how DPAF works), you wouldn't get any more detail that way.

54
EOS Bodies / Re: Are These The EOS 7D Mark II Specifications?
« on: August 22, 2014, 04:28:30 PM »
Also worried about the "fine detail"...I really don't want them to start removing AA filters. That is just a dumb trend that photographers like simply because they do not understand the value of an AA filter, or the ease by which AA softening can be sharpened.

Any soft image can be sharpened. But the images that are sharpest in RAW without sharpening are going to take post processing much better.

I'm actually kind of shocked to see someone on a camera forum advocating soft images.

The 7D was the softest Canon DSLR I've owned (and I've owned a bunch). So any move away from that buttery, waxy look is progress.

Do you think camera makers put in those horribly expensive AA filters because they want to increase their expenses and reduce image quality?  They're there for a reason - to reduce aliasing, which is a totally impossible to remove artifact once it has been sampled into the raw data.

55
EOS Bodies / Re: Are These The EOS 7D Mark II Specifications?
« on: August 22, 2014, 04:11:10 PM »
From what I've read about DIGIC 6, a lot of the processing power is dedicated to image processing, not just your basic readout and write to RAW. I would be willing to bet that any IQ improvement in the 7D II comes from the pair of DIGIC 6 chips. As for frame rate, as I mentioned in my original post, Canon probably wants to reserve frame rates greater than 10fps for their premium 1D line, which is understandable IMO.

Still it seems like a single DIGIC 6 would do the job for the specs we've been given.  Maybe the second one is for faster focusing, faster dual-pixel focusing, or something we haven't been told like dual ISO sampling.

Or, maybe the rumor is wrong.

56
EOS Bodies / Re: Are These The EOS 7D Mark II Specifications?
« on: August 22, 2014, 04:05:28 PM »
Actually, the use of Dual DIGIC 6 makes me really think that there is NO more magic cooked into the sensor, and that all the "magic" is happening after the signal is pulled OFF the sensor. It's probably roughly the same sensor that employs a slightly new DPAF design, and probably has a very weak or no AA filter, but is otherwise unchanged from the 70D. DIGIC 6, which actually came out before Sony BionzX, actually has a LOT of the same capabilities, and is the primary reason the IQ on their smaller form factor cameras is good. They really cook the signal coming off the sensor.

Since DIGIC 6 supposedly allows frame rates to 14fps and 60fps video, why would they need two of them?  Dual pixel works okay on the 70D with just one DIGIC 5+.

57
EOS Bodies / Re: Are These The EOS 7D Mark II Specifications?
« on: August 22, 2014, 03:53:14 PM »
70D native top iso 12800
7D - 16000

If correct doesn't sound like 'just' a 70D with AA removed to me??

That's only a third of a stop.

58
EOS Bodies / Re: Are These The EOS 7D Mark II Specifications?
« on: August 22, 2014, 03:31:34 PM »
Do you suppose a 15-85 STM would be a drive motor only update or an optical update as well?  I've been very pleased with the optics of my 15-85.

59
EOS Bodies / Re: Are These The EOS 7D Mark II Specifications?
« on: August 22, 2014, 03:07:40 PM »
Where is the Hybrid viewfinder ?

I'd also like to know if it has 1:1 crop mode in video (or, an even better implementation of that).

60
EOS Bodies / Re: Are These The EOS 7D Mark II Specifications?
« on: August 22, 2014, 03:02:59 PM »
65 AF points “All Cross-type”. Dual cross on the center point.

I'd like to know how many of those are f/8 AF points.

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