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Author Topic: Canon Dual Pixel Liveview Autofocus  (Read 26669 times)

traveller

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #45 on: July 03, 2013, 05:06:30 AM »
AFMA is certainly not well advertised, it wasn't in the specification, but is welcome.

Canon USA doesn't list AFMA in the specs of any camera with the feature.   Canon UK does, though.

The DPReview hands on preview also mentions that Canon have reinstated AFMA, so I'm guessing that this is an omission from the Canon USA website. 

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #45 on: July 03, 2013, 05:06:30 AM »

dr croubie

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #46 on: July 03, 2013, 07:09:42 AM »
If this thing is already doing pixel-binning for 40 half-pixels, wouldn't it be trivial to have it pixel-bin 4x and make a very nice noise-free 10MP image?  I'm sure that Digic5+ can handle that...

I'm pretty sure that's what the C300 does (I'm not sure if it straight-out bins them or does something else fancy, but yes, it can be done...)
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mb66energy

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #47 on: July 03, 2013, 07:11:22 AM »
If this thing is already doing pixel-binning for 40 half-pixels, wouldn't it be trivial to have it pixel-bin 4x and make a very nice noise-free 10MP image?  I'm sure that Digic5+ can handle that...

In the telecom world anyway, having 4 signals to work with and compare makes a huge difference in the quality of the transmission.

The 70D has an mRAW mode with 11Mpix RAW file output - it isn't exactly 2x2 (sub)pixel binning which would lead to rectangular pixels ...

Here the information from the Japanese Canon website:
RAW:   5472×3648   20 MPixel    24 MByte
mRAW: 4104×2736  11,2MPixel    19 MByte
http://cweb.canon.jp/eos/lineup/70d/feature-highquality.html

The difference in file size doesn't justify using mRAW alone - perhaps DPP runs faster on the 11MPixel files so you can use an older PC for a longer time.
But if RAW stores the real raw information so it might be a better idea to use the full resolution and scale the images down to 10 MPixels afterwards! This is sth. like binning on a irregular way.

EDIT: Or use 5MPix: 2736 x 1824 Pixels - so you got 1 red, 2 green and 1 blue sensor pixel for each image pixel! - same resolution like the first implementation of foveons and real full color image pixels. In some cases probably helpful to get cleaner colors/contrasts with monochromatic light sources or software red filters.
« Last Edit: July 03, 2013, 07:17:41 AM by mb66energy »
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akiskev

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Re: Canon Dual Pixel Liveview Autofocus
« Reply #48 on: July 03, 2013, 10:13:55 AM »
Impressive stuff!

If I was a pro focus puller, I'd be a little concerned :D :D :D
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Re: Canon Dual Pixel Liveview Autofocus
« Reply #48 on: July 03, 2013, 10:13:55 AM »