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New Contributor
paulbpilot
Posts: 4
Registered: ‎01-01-2014

Inconsistent focus with 70D

I'm struggling with gettng consisten focus results with my 70D. I can take two shots, one auto-focused right atfter the other, restablishing focus for each, and get very different focus results.

 

The setup:

Mode: AV

Lens: New Canon 70-20 mm 2.8 IS USM, zoomed to max

ISO: Auto

Style: Standard or Auto

Single Shot

Single point focus

 

Shooting across my back yard, approx 75 ft at woodend fence that contains lots of grain, and high contrast weathering. I can take on shot, handheld, refocus on another object, come back to the exact same spot on the fence, re-foucs and shot. One pic will be tack sharp on close inspection (fine grain in the wood is crisp) the other will have all the wood grain blured out with no definition. What the heck is going on?

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Frequent Contributor
Yorptunes
Posts: 42
Registered: ‎12-25-2013

Re: Inconsistent focus with 70D

I have a new 70D and went out shot some test frames at about 75 feet using my canon 70-200 1:2.8.  I shot on AV with auto focus through the viewfinder.  My lens was set to 2.5 mm oo, with stabalizer mode on 1, stabalizer on.  

 

My test frames came out identical.  I up loaded them to my MAC Pro using a 42 incc monitor.  I could not see any difference.  

 

I am sure you doubled checked all your settings, if so I have no idea why your not getting considtent auto focus.  

 

John

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Frequent Contributor
Yorptunes
Posts: 42
Registered: ‎12-25-2013

Re: Inconsistent focus with 70D

On second thought try using a tripod and see if there is any improvement.
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New Contributor
paulbpilot
Posts: 4
Registered: ‎01-01-2014

Re: Inconsistent focus with 70D

Definately looks like focus and not camera shake. I was shooting in broad daylight at 2.8. Didn't note shutter speed, but it woulda be fast. What's puzzles me, is that the only vaiable in the equation is the focus on a new object inbetween the shots. I never moved, changed a setting, or anything. It's strange for sure.

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Esteemed Contributor
ebiggs1
Posts: 2,036
Registered: ‎12-07-2012

Re: Inconsistent focus with 70D

Paul, "...  is that the only vaiable in the equation is ..." and you!

Even at high shutter speeds you can get movement just not as likelky.

EOS 1Ds Mk III, EOS 1D Mk IV
EF 24-70mm f2.8 L, EF 70-200mm f2.8 L, Sigma 120-300mm f2.8 EX APO
Photoshop CS6, ACR 8.4, Lightroom 5.6
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New Contributor
paulbpilot
Posts: 4
Registered: ‎01-01-2014

Re: Inconsistent focus with 70D

If focus. Not movement.
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Frequent Contributor
Maria
Posts: 64
Registered: ‎07-21-2013

Re: Inconsistent focus with 70D

Makes me wonder more about my issues with my new 70d .... Would sort of explain why some back to back shots are in focus and some not... Or in my case 'sharp' - I can't tell if which...
____________________
Body: Canon 6D, Canon T1i, Canon Elan II,
Glass: Canon 24-70mm f/2.8L II USM, Canon 18-55 kit lens, Sigma 70-300mm f4-5.6, Canon 50mm f/1.8,
Flash: Canon Speedlite 430ex ii
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New Contributor
paulbpilot
Posts: 4
Registered: ‎01-01-2014

Re: Inconsistent focus with 70D

Yep. At first I thought it might be the Tamron lens I'm using, because they don't yet say it's fully 70D compatible. Still testing. But a new Canon 70-200 2.8 IS II should be spot on.
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Frequent Contributor
SGFFX
Posts: 28
Registered: ‎01-18-2014

Re: Inconsistent focus with 70D

[ Edited ]

Are you manually setting an AF point? If so, try putting that AF point on the same spot every time.
Another thought: did the light change between shots? There may have only been seconds between shots but maybe the sun went behind a cloud and there was less contrast for AF to use.

Lastly, I have a 6D and was seeing inconsistent focusing. I shoot in RAW and I have turned off High ISO Noise Reduction (this is one parameter that is applied even in RAW). This made a big difference in correcting "softness" in the focus.

 

Note that even when shooting in RAW what you see on the LCD is jpg. So any optional "enhancements" are applied to the LCD image and will not be applied to the RAW image file. In other words what you see on the LCD in not necessarily what you will see in the image file. If you turn off all of the corrective/enhancement settings then RAW and what you see an the LCD should be very similar. This last suggestion only matters if you shoot RAW.

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Reputable Contributor
ScottyP
Posts: 526
Registered: ‎12-02-2012

Re: Inconsistent focus with 70D

I'm with SGFFX. Are you using just the center AF point, or are you letting the camera pick whatever points it feels like?

Try something other than the fence. Try an actual object/target that stands out away from the background. A fence sounds like it would kind of BE the background, and it could be hard to get the camera to grab just one part of it without a clearer subject in the foreground.
Scott

Canon 6D, Canon T3i, EF 70-200mm L f/2.8 IS mk2; EF 24-105 f/4 L; EF-S 17-55mm f/2.8 IS; EF 85mm f/1.8; Sigma 35mm f/1.4 "Art"; EF 1.4x extender mk. 3; 3x Phottix Mitros+ speedlites

Why do so many people say "fer-tographer"? Do they take "fertographs"? .....mustn't....get....upset.....ahhh.....happy place....happy place.....
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