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Thread started 29 Apr 2012 (Sunday) 21:12
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Help - 7D focus issues, can't replicate

 
Kingnog
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Apr 29, 2012 21:12 |  #1

Hi all,

I went out for a photo shoot today with my 7D, Tamron 17-50mm f/2.8 non-VC, and my Canon 100mm macro. I took about 30 pictures with each lens. With the same ISO & aperture settings, shutter speed 1/500 or more, and focus point selected on the eyes, every single 100mm picture was "hazy". The 17-50mm was consistently OK.

After I came home I tried to replicate this problem indoors and I couldn't. I checked for focus issues, and there is no back focus/front focus issue using a chart.

It was sunny outside and I was using a flash. The problem occurred when the subject was back-lit, front-lit, side-lit, and in the shade...like I said, every single picture. I never noticed this with my XSi and today was my first time outside with the 7D.

Examples below, 100mm first and then 17-50mm @ 50mm. SOOC, no sharpening. ISO 100, f/4.0, 1/500


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kin2son
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Apr 29, 2012 21:13 |  #2
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cheap filter? Focus limiter set at the wrong place?


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Kingnog
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Apr 29, 2012 21:15 |  #3

kin2son wrote in post #14350451 (external link)
cheap filter? Focus limiter set at the wrong place?

Focus limiter is on 0.31-infinity. Both have a multicoated Hoya.




  
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Hitthespot
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Apr 29, 2012 21:31 as a reply to  @ Kingnog's post |  #4

Were you shooting in manual, auto, AV, TV, mode? You said you cannot duplicate the problem? So the lens is working fine now?

I have a 7D also and will need a lot more information, so forgive me if I ask a lot of questions to try and help you figure it out.


Canon 7D, 24-105 f/4L IS, 70-200 f/4L IS, 100-400 f/4.5-5.6L IS, 430EX II,

  
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j1mmyj4m
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Apr 29, 2012 21:35 |  #5

Kingnog wrote in post #14350462 (external link)
Focus limiter is on 0.31-infinity. Both have a multicoated Hoya.

I'd try removing the filters (on both) and test again.




  
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Hitthespot
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Apr 29, 2012 21:48 as a reply to  @ j1mmyj4m's post |  #6

I would not think the filter is the problem if he hasn't removed it and can't duplicate the problem.


Canon 7D, 24-105 f/4L IS, 70-200 f/4L IS, 100-400 f/4.5-5.6L IS, 430EX II,

  
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j1mmyj4m
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Apr 29, 2012 22:18 |  #7

Hitthespot wrote in post #14350667 (external link)
I would not think the filter is the problem if he hasn't removed it and can't duplicate the problem.

True, but why not eliminate something simple first? I'd take them off and shoot for a week or two and see if it pops back up. Then put them back on and see if it returns. There are too many variables to give a definite armchair analysis in this situation, imo.




  
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Kingnog
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Apr 29, 2012 22:41 |  #8

I was shooting in single shot manual with flash. I chose the AF point and focused on the eyes. The lighting was similar with both lenses. Here is another "hazy" image @ F/2.8 (even the focus point wasn't in focus). Maybe it has something to do with the bright sunlight? I can't duplicate it indoors but I will try tomorrow with and without the filter.

It looks like a strange glowing effect.


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xenophobe
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Apr 29, 2012 22:54 |  #9

My 100L is tack sharp @ portrait range in all sorts of lighting conditions... it's actually quite a forgiving lens. Try again without the filter?


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Hitthespot
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Apr 29, 2012 23:07 as a reply to  @ xenophobe's post |  #10

Your absolutely positive the lens was set to auto focus and not manual focus? I know that's a simple question for an experienced photographer but I can't think of anything that would cause the picture to be out of focus but that. In single shot mode you should be getting a focus lock confirmation and the focus square should blink red. Was you getting that?


Canon 7D, 24-105 f/4L IS, 70-200 f/4L IS, 100-400 f/4.5-5.6L IS, 430EX II,

  
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Snydremark
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Apr 29, 2012 23:14 |  #11

Send the camera in and have Canon look at it. I used to get intermittent issues like that when I first got mine and they cleared it right up....and get the UV filters off of there.


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dscri001
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Apr 30, 2012 00:43 |  #12

Might sound silly but you said you were in one shot, is it possible you locked focus, fired off a few pictures with out refocusing? I.e. You/subject started moving. This happened to me once. Had the focus 'beep' off and completely forgot to fully take my finger off the shutter and didn't refocus after the slightest movements.


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jwcdds
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Apr 30, 2012 01:19 |  #13

I probably missed it but are you shooting with the 100L. If yes, then did you at least let the IS spool up about 1/2-second before taking the picture? I know it sound somewhat stupid to have a more expensive but then need to wait for the IS to spool, but sadly, that is the case. If the IS wasn't already activated and stabilizing prior to focus-lock and exposing the shot... sometimes, the camera will go ahead and take the shot (because AF-locked) but the IS is still spooling.

I've seen "blurry" images like this in the past with my 100-400L with picks taken at the airshows. Only other time I've seen the blurriness is when I'm shooting (regardless what what lens I'm using) through the windshield of my car. :lol:


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hollis_f
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Apr 30, 2012 05:10 |  #14

dscri001 wrote in post #14351392 (external link)
Might sound silly but you said you were in one shot, is it possible you locked focus, fired off a few pictures with out refocusing? I.e. You/subject started moving.

This is my guess also. The 100mm image was at f2.8, the 50mm at f4. That's going to mean a substantial difference in the depth of field. So large that the sort of movements you're talking about would show up in the former case, but not in the latter.

If people want to test their gear for problems then you need to minimise any possible interference. That means using a static subject and a static camera - i.e., on a decent tripod.


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Kingnog
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Apr 30, 2012 16:59 |  #15

OK - I did some more testing when I got home. It's not the filter or the camera settings. I put the 100mm macro up head-to-head with the 70-300mm IS USM and the 100mm is soft all the way up to f/8, worst at f/2.8.

Here are two shots with the 100mm at f/2.8. Focus was at center point.


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Help - 7D focus issues, can't replicate
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