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General photography questions and answers: Discuss Back focus problem in group shoot...Can anyone help solve this problems, I always get blurr face on some people when I shoot in a group ...
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Old 20-11-2013, 17:22   #1 (permalink)
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Back focus problem in group shoot

Can anyone help solve this problems, I always get blurr face on some people when I shoot in a group of six or more, for groups shoot I use Nikon d600 camera with Tamaron 24-70mm lens, shoot at f3-f5, Iso 500

What I'm doing wrong?
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Old 20-11-2013, 17:37   #2 (permalink)
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Re: Back focus problem in group shoot

The first thought to cross my mind is that there isn't enough "depth of field" to cover the people. A lens only focuses on one exact distance, with objects not at this distance becoming increasingly out of focus, or blurred. In your situation, the area in focus will extend further behind the plane of focus than in front. Depth of feild increases with increasing distance, and increases with short focal lengths. It also increases as you stop down (use a smaller aperture or larger f number to do this).

Whether this is the explanation in your case depends on things you don't tell us - what was the subject distance, were they stacked on row(s) one behind another and so on. There is even the possibility that the camera wasn't focusing on what you wanted it to.
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Old 20-11-2013, 17:51   #3 (permalink)
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Re: Back focus problem in group shoot

Welcome to Pixalo JLPhoto

I've moved your post here as it is a more appropriate forum and will likely get more replies.

Are we talking about a single line of people, or two or more lines one behind the other? As you mention back focus in the thread title, I'm thinking there are two lines or more.

Things that spring to mind are what focus mode are you using? Where are you focusing in the group and do you have sufficient depth of field?
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Old 21-11-2013, 13:27   #4 (permalink)
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Re: Back focus problem in group shoot

Hi, it sounds like it is either a depth of field problem or a shutter speed problem. The f stop you are currently shooting at is f3 - f5 which will give you a narrow depth of field (stuff that's in focus from front to back of picture) try f11 or something in that region.
The other issue could be that if your shutter speed is to slow and some people in the group move a little when you take the shot then they will be blurred. Depending on what lens you are using depends on what minimum shutter speed you should be using. In general though if you are hand holding I would not go lower than 1/60th/sec
Try around 1/125th/sec arms in close by your side and hold your breath...... just till you take the shot then you can breath again
Hope that helps.
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Old 21-11-2013, 16:38   #5 (permalink)
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Re: Back focus problem in group shoot

I get back focus on both, single line and on a row, last problem I notice when I shot a sinlge line of 6 people, I was about 5 feet away, zoom out everything, I never shoot higher than f5, probably thats the problem, thanks everybody
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Old 21-11-2013, 17:18   #6 (permalink)
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Re: Back focus problem in group shoot

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Originally Posted by JLphoto View Post
I get back focus on both, single line and on a row, last problem I notice when I shot a sinlge line of 6 people, I was about 5 feet away, zoom out everything, I never shoot higher than f5, probably thats the problem, thanks everybody
This suggests that you are using the wide end of your lens. Whilst this can give you a good depth of field, it can also introduce distortions towards the edge of the field of view. Try using at least 50mm or higher and see if this improves things. This will also force you to be further back from your line. I'd also try a smaller aperture as if your line is not exactly at 90 degrees to you, there will be a variation in distance along the line which might be greater than the depth of field.

If it is as you say 'backfocus' you might not be focusing on the right part of your subject.
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Old 21-11-2013, 17:47   #7 (permalink)
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Re: Back focus problem in group shoot

More to the point did they all stay still
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Old 21-11-2013, 17:52   #8 (permalink)
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Re: Back focus problem in group shoot

thanks Graham,,,,yes they all stay still (muscle)
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Old 21-11-2013, 19:41   #9 (permalink)
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Re: Back focus problem in group shoot

Perhaps you could upload a photo so we can see what the problem is.
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Old 12-12-2013, 07:40   #10 (permalink)
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Re: Back focus problem in group shoot

Hi JL Photo, f5 sounds a narrow aperture for group shots, when I did weddings some years ago the lowest I shot was f8 and if I was posing a 'deep' group i would go to f11 on an 80mm lens on a medium format camera, the equivelant of a 50mm on 35mm. Personally I would only use f5 for a single portrait making sure I was focused on the eyes.
One thing you could try to help you decide is to practice, get 3 friends or family, use one as a focus point and position the other 2 people in front and behind the first at varying distances and shoot 3 or 4 pictures at different apertures, then check the results out to determine your optimum aperture.

Hope this helps.
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Old 12-12-2013, 23:20   #11 (permalink)
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Re: Back focus problem in group shoot

yep you have found your own problem f5 is not going to give you a large enough DoF for group shots
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Old 04-01-2014, 20:01   #12 (permalink)
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Re: Back focus problem in group shoot

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