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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 21 Feb 2018 (Wednesday) 20:33
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5d4, 100-400 ii, 2x tele iii, focusing

 
chuckmiller
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Feb 21, 2018 20:33 |  #1

Today for the first time I assembled this combo. As expected it wouldn't autofocus below f/8. Well, not through the viewfinder, but it did focus with small apertures using Live View. I wasn't expecting that. Is that well known and I have overlooked it?


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Choderboy
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Feb 21, 2018 21:41 |  #2

I think it's well known. I don't know every body's capabilities but 7D will live view AF at f11 so it's not a recent thing.


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https://www.flickr.com​/photos/12185187@N00/
5D4, 1D4, 1DS2. Canon, Sigma lenses
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chuckmiller
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Feb 21, 2018 21:47 |  #3

Well this is a nice surprise.


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davesrose
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Feb 21, 2018 22:06 |  #4

Live view has more accurate contrast detect or dual pixel AF: systems that use the millions of pixels on the sensor. So as well as low light AF, they also are considered more accurate (since they have many points to sample from). Historically, contrast live view systems have been slower to focus then phase detect optical systems....but technology improves, and now live view systems are pretty sophisticated.


Canon 5D mk III , 7D mk II
EF 135mm 2.0L, EF 70-200mm 2.8L IS II, EF 24-70 2.8L II, EF 50mm 1.4, EF 100mm 2.8L Macro, EF 16-35mm 4L IS, Sigma 150-600mm C, 580EX, 600EX-RT, MeFoto Globetrotter tripod, grips, Black Rapid RS-7, CAMS plate and strap system, Lowepro Flipside 500 AW, and a few other things...
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chuckmiller
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Feb 23, 2018 10:28 |  #5

Yes the live view AF is slower but seeing it work at smaller than f/8 is a nice suprise!


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chuckmiller
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Post edited 3 months ago by chuckmiller.
     
Feb 26, 2018 08:41 |  #6

Simply test shots.

I noticed the late afternoon sun was looking nice for a few moments so I grabbed some test shots to watch the live view autofocus work. For most every subject I shot it at 100mm and then again at 400mm, so really it was 200mm-800mm, ranging from f/9 to f/32 i think, hand held with 1250 shutter, auto ISO capped at 6400. In full sun the combo did pretty well.

These are jpg from the camera, no post editing, no noise reduction, nothing. Take a look >> https://flic.kr/s/aHsm​dq1nTR (external link)


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5d4, 100-400 ii, 2x tele iii, focusing
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