September 18, 2014, 10:13:44 AM

Author Topic: Canon Dual Pixel Liveview Autofocus  (Read 13659 times)

hamada

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #15 on: July 02, 2013, 05:16:22 AM »
Is there any news about their fabricating process? Does the sensor apply to the former 500nm or did Canon change to 180nm, 90nm, or even 65nm parts?

+1... would like to know that.

and as nice as better live view AF is.
im sure video guys will love it. but overall i only shoot 20 minutes video since 2009 with a DSLR.  ;)
and i use live view only for tethered studio shots.... where i have all the time to focus.
so no big deal for me.

for me image quality is the most important point.
« Last Edit: July 02, 2013, 05:23:50 AM by hamada »

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #15 on: July 02, 2013, 05:16:22 AM »

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #16 on: July 02, 2013, 06:18:52 AM »
The new AF-system is faster, but can´t beat the AF-system of the HG3, G6 and GF6.

The 19-point-AF-system is the 7D AF system. I call it product recycling.

Under the line the 70D is no big deal, but very attractive (for beginners and advanced hobby photographers) for the price.

thelebaron

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #17 on: July 02, 2013, 06:56:58 AM »
i think docu/wedding videographers will be all over this, and it also would be great for casual family stuff

thelebaron

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #18 on: July 02, 2013, 06:58:14 AM »
really interested to see how the next professional body will be with all these things at the lower tiers(integrated wifi, touchscreen, video autofocus).

hamada

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #19 on: July 02, 2013, 07:20:10 AM »
The new AF-system is faster, but can´t beat the AF-system of the HG3, G6 and GF6.


i had the GF6 for a couple of days the AF is not that impressive.

aj1575

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #20 on: July 02, 2013, 07:23:54 AM »
Does anyone of you wonder how Canon made it possible to read out AF-informations out of about 24 million photodiodes and process them? This is quite amazing that they were able to do this. I have no idea how this actually works. I have no problem to understand how they do it with their linear or crosstype sensor; there they have 19 or 53 or something, now they have 12 millions!?!.


Woody

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #21 on: July 02, 2013, 07:26:18 AM »
The new AF-system is faster, but can´t beat the AF-system of the HG3, G6 and GF6.

Prove this

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #21 on: July 02, 2013, 07:26:18 AM »

Bob Howland

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #22 on: July 02, 2013, 07:26:59 AM »
Interesting and promising.  Still not as fast as true phase AF, I expect.

Still...I was considering the EOS M, but maybe I'll wait for the EOS M MkII with this technology...   ;)

For video, I would not want instantaneous autofocus, since that would provide no transition period. I would, however, want the autofocus to be smooth, with no hunting whatsoever, basically a superb electronic implementation of a highly-skilled focus puller (i.e., first assistant cameraman). (High slew rates provide faster response but are more prone to hunting.)

As for the M MkII, I agree completely, something to replace my G10 but with superb ISO6400 image quality and a decent EVF.
« Last Edit: July 02, 2013, 07:36:26 AM by Bob Howland »

Dylan777

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #23 on: July 02, 2013, 08:39:50 AM »
I'm interested...for video ;)
« Last Edit: July 02, 2013, 08:42:56 AM by Dylan777 »
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jasonsim

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #24 on: July 02, 2013, 08:41:49 AM »
Does it have AFMA?
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garyknrd

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #25 on: July 02, 2013, 09:26:29 AM »
 The movie AF is of interest to me. Will not buy the 70D camera, but if the technology is really that good. Hope they start implementing it in other cameras?  I have tried video with the birds I shoot and it is a real pain. This is a great feature. Right up my alley. I really want to get into wildlife videos. Looks like a fun and interesting hobby.
Things are looking up for me with this technology.
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weixing

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #26 on: July 02, 2013, 09:47:06 AM »
Hi,
    If this dual cmos AF going into their compact camera, it'll be very interesting... ;D

    I'm thinking of getting a SX50 to complement my EF 400mm F5.6L for birding, now I think I'll wait for the next model and hopefully, they'll incorporate this into their next generation of ultra zoom camera... hmm... actually, the SX50 pixel is already so small, just wonder can they still maintain usable ISO 800 if split it into 2???

   Have a nice day.

traveller

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #27 on: July 02, 2013, 10:08:33 AM »
The proof of this pudding will be the new sensor; if it can catch up with (or surpass) the competition, the 70D will be regarded as a great camera.  If this new 20.2MP APS-C sensor is simply a rework of previous designs, the 70D will be seen as just another re-hash of the same old formula Canon, with yet more emphasis placed upon video.     

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #27 on: July 02, 2013, 10:08:33 AM »

rs

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #28 on: July 02, 2013, 10:17:30 AM »
Interesting development.

For some number of pixels, it is going to reduce (halve?) the amount of light that is received by the photo diode.

If this is the green pixels, as suggested by some diagrams, then it may make little/no overall difference as there are already twice as many green receptors as there are red/blue.

Additionally, this means that there will be some pixels that do not record the same level of light as others. This will need a bit of new fancy footwork for raw converters to properly evaluate what it means to have a pixel that is not and will never have the same luminosity as all of the others around it.

This has potential to have an adverse impact on noise simply due to there being less signal available.

Will be interesting to see the outcome!
Each and every of those 20.2 million active pixels that makes up the picture (whether red, green or blue) is divided into two pixels. One for the left phase, and the other for the right phase. They both hide behind one micro lens, and are positioned next to each other (hopefully without any appreciable gap, as that might cause a strange bokeh effect) to receive the phases. Combined, they theoretically cover pretty much the same area as a conventional photodiode, and should give the same light gathering capability. Its no more than pixel binning to recreate a normal image from this sensor, with normal light gathering capabilities.

So in theory this dual pixel configuration should have no detrimental effects on SNR over a conventional 20.2MP APS-C sensor. Let's hope they've used a new sensor fabrication process to manufacture this sensor, to bring along the much anticipated (and reported) improvements in SNR - I'm guessing that was is in effect a 40.4 MP APS-C sensor would be next to impossible to make with the old sensor fabrication process.
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jrista

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #29 on: July 02, 2013, 10:35:29 AM »
According to DPR (http://www.dpreview.com/previews/canon-eos-70d/3), it sounds like PDAF in live view/video recording is possible ANYWHERE in the covered area of the sensor (80% of the central region). That seems pretty impressive...once live view or video AF tracking kicks in, it wouldn't matter where the subject was...there are theoretically no AF points in that mode...the entire sensor is an AF sensor at that point. Sounds like some intriguing new tech to me. :)
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Re: Canon Dual Pixel Liveview Autofocus
« Reply #29 on: July 02, 2013, 10:35:29 AM »