01-01-2014 06:45 PM
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.
Lens: New Canon 70-20 mm 2.8 IS USM, zoomed to max
Style: Standard or Auto
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?
01-01-2014 08:29 PM
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.
01-01-2014 10:32 PM
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.
01-02-2014 10:10 AM
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.
01-02-2014 08:21 PM
01-02-2014 09:48 PM
01-24-2014 09:51 PM - edited 01-24-2014 09:54 PM
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.
01-25-2014 02:48 PM