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VIP
Posts: 11,491
Registered: ‎12-07-2012

Re: Bokeh has parallel lines with 100-400 f4.5-5.6 and slower autofocus

Great pictures are made in post, not in the camera.  Usually, that is.  You need to and if you don't learn PS and/or LR you can probably forget great bird photos.

Don't kid yourself, a lot or even most all great bird shots are cropped.

 

BTW, that servo motor harmonics thing, whatever, is more likely just a good theory.  Nothing more.  Ditch the filter and learn how to post edit.

EOS 1DX and 1D Mk IV and several lenses!
VIP
Posts: 11,491
Registered: ‎12-07-2012

Re: Bokeh has parallel lines with 100-400 f4.5-5.6 and slower autofocus

Also forgot to mention, your sandpiper is real nice.  That's what you'er after.  Keep doing it.

EOS 1DX and 1D Mk IV and several lenses!
VIP
Posts: 8,471
Registered: ‎08-13-2015

Re: Bokeh has parallel lines with 100-400 f4.5-5.6 and slower autofocus

I give up.  I took a few hundred pictures the same day I shot the robin.  There seems to be no rhyme or reason as to why a handful of shots show the parallel line bokeh.  I can only speculate. 

 

Here's a shot with same shutter speed, and exposure.  EXIF says AI Servo was active, but the crow was motionless.

 

CT7D2016_06_100483-3.jpg

 

The only variable that is changing is AF mode, and whether or not AI Servo is actively tracking.  Remember, I'm using BBF.  In the above shot, the bird was grubbing for worms, so I grabbed a focus in AI Servo and kept it active.  Thanks, to the Show Focus Points plug-in for Lightroom, I can tell whether or not AI Servo is active or not.

 

Show_Focus_Points_Legend.PNG

 

When AI Servo is active, then the "red+black" focus point is displayed.  When I release the BBF button, then the "red+white" focus point is displayed.  This shot, and the robin shot, are both reported with a "red+black" focus point.  In DPP4 there is also a way to tell when AI Servo is active, too.   Curiously enough, when you look at the EXIF data of shots when the BBF button has been released, but after focus has been locked on something, then no AFMA data is recorded, which corresponds to the first scenario shown above, "red+white".

 

I cropped it as close to 1:1 as I could.  Clean bokeh, without any lines.  Same filter, lens, camera, photographer, exposure, BUT, it is a different bird.  I NEVER see the distortion when I've released the BBF button, which does not mean that I will always see it when AI Servo is active.  And, I never see the distortion when AI Servo seems to have nailed the focus, either.

 

That's all for now, folks.  I'll start a new thread on this, if I have anything conclusive to add.

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"I don't rent software. I use Photoshop CS6, ACR 9.8 and Lightroom 6.8 ."
VIP
Posts: 11,491
Registered: ‎12-07-2012

Re: Bokeh has parallel lines with 100-400 f4.5-5.6 and slower autofocus

Not sure about your guesses as to what's wrong, but that bird is not a crow!  It is a common starling.

EOS 1DX and 1D Mk IV and several lenses!
VIP
Posts: 8,471
Registered: ‎08-13-2015

Re: Bokeh has parallel lines with 100-400 f4.5-5.6 and slower autofocus

"BTW, that servo motor harmonics thing, whatever, is more likely just a good theory.  Nothing more.  Ditch the filter and learn how to post edit." 

 

"Good theory?"  That's a compliment.  I consider it to be a wild guess, just a blind shot in the dark. 

 

The use of a UV filter seems to make no difference.  I've seen it both with and without.  For me, it just seems to appear at certain shutter speeds in AI Servo mode.  It could also be the IS at work.  I haven't figured out a way to rule out the Image Stabilization, not short of turning it off, because there is nothing in the EXIF data that reports the state of the lens in that detail.

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"I don't rent software. I use Photoshop CS6, ACR 9.8 and Lightroom 6.8 ."
VIP
Posts: 8,471
Registered: ‎08-13-2015

Re: Bokeh has parallel lines with 100-400 f4.5-5.6 and slower autofocus


@ebiggs1 wrote:

Not sure about your guesses as to what's wrong, but that bird is not a crow!  It is a common starling.


Crow?  That was another guess.  Too lazy to look it up, really.  It seemed to be too small to be a crow.

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"I don't rent software. I use Photoshop CS6, ACR 9.8 and Lightroom 6.8 ."
VIP
Posts: 11,491
Registered: ‎12-07-2012

Re: Bokeh has parallel lines with 100-400 f4.5-5.6 and slower autofocus

Crows have black bills.

 

 Your investigation of the bokeh problem is interesting to say the least.  i don't think the IS is the culprit, however.  if it is, it must be unique to the 100-400.

EOS 1DX and 1D Mk IV and several lenses!
VIP
Posts: 8,471
Registered: ‎08-13-2015

Re: Bokeh has parallel lines with 100-400 f4.5-5.6 and slower autofocus


@ebiggs1 wrote:

Crows have black bills.

 

 Your investigation of the bokeh problem is interesting to say the least.  i don't think the IS is the culprit, however.  if it is, it must be unique to the 100-400.


Black bills, you say?  I have no idea what type of birds they are.  I know crows were in the area, because I could hear the distinctive "caw caw" of crows in the trees.  All I know for certain is that these birds are ugly and aggressive, but smallish.

 

CT7D2016_06_100487.jpg

 

I don't know what to think about the bokeh.  It shows up in the 150-600, too, but randomly scattered line segments, not parallel lines.  I;m not using sleep over it.  I'm gonna blame stray nuetrinos.  Case closed.

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"I don't rent software. I use Photoshop CS6, ACR 9.8 and Lightroom 6.8 ."
VIP
Posts: 11,491
Registered: ‎12-07-2012

Re: Bokeh has parallel lines with 100-400 f4.5-5.6 and slower autofocus

"Black bills, you say? "

 

Yes, Crows have black bills. The second bird is still a Common Starling.  They have black bills in winter.  It turns yellow in the summer.  It is not uncommon for birds to change colors of some parts with the season.  Starlings can mimic other bird's call. too.  They are considered a nuisance bird by most people.

EOS 1DX and 1D Mk IV and several lenses!
VIP
Posts: 11,491
Registered: ‎12-07-2012

Re: Bokeh has parallel lines with 100-400 f4.5-5.6 and slower autofocus

But the bokeh lines thing.  I think it is well known that the 100-400 doesn't do well with any filter.   My guess it is the filter or perhaps a combination of things.  Filter, exposure + editing, etc.

I have never seen it in my shots.

 

"It shows up in the 150-600 ..."  It hasn't in mine and I have both versions, or I mean all versions.  But I haven't tried to duplicate it.

EOS 1DX and 1D Mk IV and several lenses!
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