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Thread started 01 Jan 2011 (Saturday) 07:44
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Am I imagining a 7D focus problem?

 
kendon
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Jan 01, 2011 08:56 |  #16

might be me, but that sample is so small that it looks like everything is more or less in/out of focus. also at 35mm and f/9 and an estimated distance of 3m gives you a DOF of 3m (3m=10'), which again would lead to almost everything being in focus in that sample. someone please correct me if i'm wrong, by all means i'm no expert on this ;)

1/13th at 35mm with IS should be ok, unless you have really shaky hands.


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Plumtreelad
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Jan 01, 2011 09:00 |  #17

kendon wrote in post #11551816 (external link)
might be me, but that sample is so small that it looks like everything is more or less in/out of focus. also at 35mm and f/9 and an estimated distance of 3m gives you a DOF of 3m (3m=10'), which again would lead to almost everything being in focus in that sample. someone please correct me if i'm wrong, by all means i'm no expert on this ;)

1/13th at 35mm with IS should be ok, unless you have really shaky hands.

Just when I had convinced myself that it was me that caused the problem, your note could suggest that it is the camera. Is that what you are hinting at?


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jaa
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Jan 01, 2011 09:01 |  #18

Plumtreelad, everything you said and have doubts about is exactly what I thought with my 7D. I even started a thread about it here -- https://photography-on-the.net/forum/showthre​ad.php?t=954464

Thankfully I talked myself into taking it into a Canon service center back before the warranty expired because as it turns out, it wasn't my imagination!!

I'm seriously in love with this camera ever since I got it back. Can't believe I put up with almost 11 months!

Be honest with yourself. If you think you've got solid understanding of the different AF modes and and when to use each one, your shutter speeds are nice and fast and you're giving the AF points something nice and contrasty to lock on and it doesn't appear that there is any other explanation for the camera missing focus, then don't keep thinking it's user error. Get it looked at. If you think that maybe you just need a bit more practise, then ultimately, that's the best thing.

Good luck!


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Plumtreelad
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Jan 01, 2011 09:04 |  #19

jaa wrote in post #11551832 (external link)
Plumtreelad, everything you said and have doubts about is exactly what I thought with my 7D. I even started a thread about it here -- https://photography-on-the.net/forum/showthre​ad.php?t=954464

Thankfully I talked myself into taking it into a Canon service center back before the warranty expired because as it turns out, it wasn't my imagination!!

I'm seriously in love with this camera ever since I got it back. Can't believe I put up with almost 11 months!

Be honest with yourself. If you think you've got solid understanding of the different AF modes and and when to use each one, your shutter speeds are nice and fast and you're giving the AF points something nice and contrasty to lock on and it doesn't appear that there is any other explanation for the camera missing focus, then don't keep thinking it's user error. Get it looked at. If you think that maybe you just need a bit more practise, then ultimately, that's the best thing.

Good luck!

Problem is that I have had the camera for 14 months! Kept putting it off and now regret it


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yourdoinitwrong
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Jan 01, 2011 09:08 as a reply to  @ jaa's post |  #20

At 35mm on a crop you need to be at 1/60th (1/FL*1.6) minimum to avoid camera shake without IS. I'm not sure how many stops the IS on the 24-105 is good for but 1/13th may still be a little slow, especially if your hands were a little shaky on that one. I'm not saying that it's definitely your fault but trying using higher SS and/or mounting the camera on a tripod (turn off the IS on a tripod) and see what type of results you get. I would also test out Single Point or Point Expansion so you know exactly what is being focused on as well. If you try this out with several of your lenses and the problem persists then you will be closer to your answer.


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Accessoire
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Jan 01, 2011 09:12 |  #21

mind if I throw in a couple pennies?
perhaps set up some shots where your shutter speed is higher, at least 1/125
on a tripod, if you like, but not necessary if you are pretty stable when shooting
then we might be able to make a better judgment
that is if you are game =)




  
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xhack
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Jan 01, 2011 09:13 |  #22

Again, not to insult, but I'm curious - why ISO800 and ƒ9 and 1/13sec. It does seem a strange combo and I'm interested to know the why and wherefore.


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kendon
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Jan 01, 2011 09:21 |  #23

Plumtreelad wrote in post #11551829 (external link)
Just when I had convinced myself that it was me that caused the problem, your note could suggest that it is the camera. Is that what you are hinting at?

not at all. why did you use the settings you used for that shot, is the question i want to imply.
and maybe you could post a better sample, where we can see better what is in and out of focus.


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Evil_Edge
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Jan 01, 2011 09:22 |  #24

xhack wrote in post #11551879 (external link)
Again, not to insult, but I'm curious - why ISO800 and ƒ9 and 1/13sec. It does seem a strange combo and I'm interested to know the why and wherefore.

I was thinking the same, those are some low light settings IMO. A little off for mid day (according to the time in your EXIF)


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Jan 01, 2011 09:42 |  #25

I have a 7D and i have found I generally *never* shoot below 1/50 second. Many times I try to get 1/125 or faster if light allows. My suggestion is to go in a good bright area and select aperture value of f/4. Use center point AF and position it over the intended subject you wish to focus on... for a person on their eye... don't worry about composition. Finally, make sure the shutter speed is 1/250 or faster. If the shutter speed is below that, increase your ISO until using f/4 results in a fast enough shutter speed.

post your pic with exif


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Plumtreelad
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Jan 01, 2011 10:11 as a reply to  @ jase1125's post |  #26

Thank you everyone. Just been out again taking some more shots. Will post in a few minutes


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mikewinburn
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Jan 01, 2011 10:26 |  #27

i don't have a 7D, but had a similar problem with my T1i (due to heavy condensation problem after being out in 90+ degree heat on July afternoon, and came into air conditioned house w/o putting it in a ziplock bag first). Even though the camera beeped with its center point focus locked, even if it looked sharp in the view finder, it was out of focus on the final capture; and sometimes it beeped for focus and looked UNfocused even in the view finder.

I had the convenience of having a friend who lived nearby with another canon camera (T2i); I purposely took almost a full 1/2 day testing all my lenses on friends camera: (tripod/ISO 200/Manual Exposure/ Av: f/8.0/ Tv: 60/ PicStyle:Faithful/ 2pics each lens: 1 Autofoucs, 1 Manual Focus / Subject: took picture of same 8x10 printed photo card / exposure comp was necessary in many cases by +/- 1/3).

In the end I was certain it was not the lenses. It was my camera. I discovered it was worse in shallow contrast situations than with high contrasting situations. Still in warranty I sent it to Canon. they serviced it for free. Sadly It's still not perfect. 1/10 shots still obviously out of focus, another 1/10 marginally out of focus (soft). So, my camera is only at 80% in my opinion. As i'm upgrading in June, I haven't thought much of it.


You're aware that by sending just the lens for calibration (and not both the camera and lens) there's really no way for them to match them together? If your point in calibrating was to make it work its best, it's best to send both the lens and the camera and the calibration will be spot on for that combo.


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Plumtreelad
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Jan 01, 2011 10:39 |  #28

yourdoinitwrong wrote in post #11551863 (external link)
At 35mm on a crop you need to be at 1/60th (1/FL*1.6) minimum to avoid camera shake without IS. I'm not sure how many stops the IS on the 24-105 is good for but 1/13th may still be a little slow, especially if your hands were a little shaky on that one. I'm not saying that it's definitely your fault but trying using higher SS and/or mounting the camera on a tripod (turn off the IS on a tripod) and see what type of results you get. I would also test out Single Point or Point Expansion so you know exactly what is being focused on as well. If you try this out with several of your lenses and the problem persists then you will be closer to your answer.

Here ia another couple of shots I have just taken. Any better?


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Acute ­ Exposure
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Jan 01, 2011 10:47 |  #29

If you open them in DPP and hit Command J (On a Mac) it will show you where your shot was focused. Take a look there and screen capture it as it will halo us help you.


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Plumtreelad
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Jan 01, 2011 10:50 |  #30

Acute Exposure wrote in post #11552301 (external link)
If you open them in DPP and hit Command J (On a Mac) it will show you where your shot was focused. Take a look there and screen capture it as it will halo us help you.

Did the first bit but How do I "screen capture it?"


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Am I imagining a 7D focus problem?
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