Help With Out of Focus Images

8 months 1 week ago #652465 by nvvisuals
Hey Everyone, I am new to this forum so please let me know if I am posting this in the wrong place. So did a beach shoot yesterday, with my new camera Canon 6D MKll and new lens Sigma Art Lens 35mm 1.4. Up until now I shot with A Canon 60D and Tamron  24-70mm 2.8 for Years. I noticed when looking through the photos today that some of the photos are out of focus when I know 100% I was focusing on the face and eyes but so many are not crisp. The images where I am closer to the model are sharp and focused but where she is far from me a lot of the images are out of focus. The Majority of the time I was shooting at 1/160 at 1.4 or 1.6. I am not used to such a low F stop, should I have brought that number up when she was further away from me? Or is this a lens issue? Any help would be appreciated! 

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8 months 1 week ago #652502 by garyrhook
Every lens has a character and idiosyncracy. First step: practice with the new lens.

I don't know about Canon, but my Nikon misses focus plenty of times, despite an unmoving subject and the camera acquiring focus via AF. Along with a buddy I can tell you this happens across at least 3 higher end bodies. My advice: get used to it.

Finally, despite what the camera may thing, a wide open f/1.4 lens has an extremely shallow depth of field (if you don't have an app to compute DoF, get one, so you have an idea what to expect). That said, Easy DoF says that a 35mm lens on a full frame body, at 10 ft distance to subject will give you about 1.3 ft. of depth.

What you don't tell is is what focus mode you're using, and that matters. Suggest you use single-point focus (or a small field of 9 points?) and see what happens. If you're using a large field of focus points and expecting the camera to know what you want... well, it doesn't. But that's just an observation since we're missing information.

I'll stop there, and hope that some of this is somewhat helpful.

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8 months 1 week ago #652506 by Nikon Shooter
The first thing to remember is that these are all machines and
they have to get used to YOU — in the sense that you can con-
figure them to your needs — I know nothing of canon.

My Nikons serve me so very well and I don't see they miss focus
unless it is my fault.

These are points to check…
  • AF points misalignment
  • rear or back focus
  • your technique when you focus and reframe
  • consider other AF options.

Light is free… capturing it is not!
This person is a posting maniac and deserves a #1 badge!Top Poster
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