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FORUMS Photography Talk by Genre Transportation Talk 
Thread started 15 Feb 2015 (Sunday) 19:13
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Focus issues with aircraft in flight

 
Pagman
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Feb 20, 2015 13:55 |  #31

Just an update - i did a factory reset today and reset the camera up and tried the focus out - in 9 point dynamic AF-C mode with release priority set 1000th shutter speed, a sea gull traveling towards me at an angle turned out spot on, and the setting nailed the focus, i tried it out again same settings on a plane coming over quite slow and at only about 10.000ft, again the focus could not lock and the focus confirm brackets were dancing back and forth, when i checked the pic under 100% viewing once again out of focus.

Is it possibly certain colors or textures causing this inconsistent focusing?


P.


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sandpiper
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Feb 20, 2015 14:47 |  #32

Pagman wrote in post #17441066 (external link)
Just an update - i did a factory reset today and reset the camera up and tried the focus out - in 9 point dynamic AF-C mode with release priority set 1000th shutter speed, a sea gull traveling towards me at an angle turned out spot on, and the setting nailed the focus, i tried it out again same settings on a plane coming over quite slow and at only about 10.000ft, again the focus could not lock and the focus confirm brackets were dancing back and forth, when i checked the pic under 100% viewing once again out of focus.

Is it possibly certain colors or textures causing this inconsistent focusing?


P.

Not so much certain colours or textures but insufficient contrast for it to find a good line to focus on can cause problems with focusing. A white plane against a pale grey sky is a low contrast situation, not helped by two miles of atmospheric haze to shoot through.

Are you using single point AF and placing it over the edge of a wing to maximise your chances? Also using a cross point to make sure you aren't using an AF point of the wrong orientation?




  
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Pagman
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Feb 20, 2015 15:54 |  #33

sandpiper wrote in post #17441186 (external link)
Not so much certain colours or textures but insufficient contrast for it to find a good line to focus on can cause problems with focusing. A white plane against a pale grey sky is a low contrast situation, not helped by two miles of atmospheric haze to shoot through.

Are you using single point AF and placing it over the edge of a wing to maximise your chances? Also using a cross point to make sure you aren't using an AF point of the wrong orientation?


I used the cluster of 9 cross type sensors at the center of the frame, they had the plane covered and lapped well over it, with bif shots the birds just jumped into focus with no hesitation, but one of the plane shots seemed a real test for the focusing, as i have said before - with my previous D90 even using just the one center cross sensor, nailing focus seemed far more reliable and automatic, i had a far higher hit rate with my older camera over my newer better camera with what is supposed to have a far better more accurate focus system.

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Pagman
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Feb 20, 2015 19:45 |  #34

This is what i can get with a BIF shot in rubbish weather - i have no complaints here with the focus it snapped into focus like a super fast thing on a fast day:-)

P.

IMAGE: https://farm8.staticflickr.com/7386/15976587663_a86f1aca22_b.jpg
IMAGE LINK: https://flic.kr/p/qkNb​TZ  (external link) DSC_1474_DxO (external link) by AM.45 (external link), on Flickr

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Perfectly ­ Frank
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Apr 06, 2015 12:49 |  #35

cicopo wrote in post #17436411 (external link)
In general we talk about panning as a side to side thing (a runner, bicycle & rider, or plane passing in front of us. At some point Mode 2 in a Canon lens has to be the wrong setting when we start panning vertical movement or are aiming up into the sky instead of out in front of us. This may or may not have any effect at high shutter speeds & I haven't done any testing (because again I rarely shoot things well up above me) but it's a possible explaination of some problems.

Interesting idea.
I shoot small aerobatic planes at air shows. Shoot them at slow shutter speeds to capture prop blur. They tend to ziz-zag all around the sky. I use mode 2 all the time.
But some times I'm moving my lens in a manner- trying to keep up with that ziz-zagging plane - that mode 2 doesn't support.

Still, my best results come with using mode 2.


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cicopo
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Apr 06, 2015 20:05 |  #36

Well I shoot at some pretty strange angles too when shooting R/C aircraft doing aerobatics & I use mode 2 to do it. That said I've read quite a bit about the different things IS is supposed to do & how it works. I've also just verified the definition of panning related to photography

http://en.wikipedia.or​g/wiki/Panning_%28came​ra%29 (external link)

http://www.usa.canon.c​om …display/Lens_Ad​vantage_IS (external link)


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Perfectly ­ Frank
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Apr 09, 2015 10:31 as a reply to  @ cicopo's post |  #37

Interesting links, thanks for sharing.


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Focus issues with aircraft in flight
FORUMS Photography Talk by Genre Transportation Talk 
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