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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 16 Nov 2011 (Wednesday) 02:46
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ARGH! 7D Fail, 400D for the win!

 
jezzarino
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Nov 16, 2011 06:50 |  #16

Lacks_focus wrote in post #13406730 (external link)
...and stop relying solely on technology? ...

lol I'm a computer tech and think that every day of the people I visit :)

But still, I have a 3 year old boy, he is berserk, its hard enough to keep him in frame let alone in focus, and I'm getting all this stuff sorted out now before he's into sports and stuff.




  
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Lacks_focus
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Nov 16, 2011 07:00 |  #17

jezzarino wrote in post #13406785 (external link)
lol I'm a computer tech and think that every day of the people I visit :)

But still, I have a 3 year old boy, he is berserk, its hard enough to keep him in frame let alone in focus, and I'm getting all this stuff sorted out now before he's into sports and stuff.

I hear ya! I shoot a lot of sports and without an accurate AI Servo, I would have given up or gone broke buying better gear long ago. The subject you tested kind of sucks. As others have said, choose a better subject or run a controlled test to establish a base line. For the pic you posted, I would have gone for something with a cleaner line of contrast, like the fence line behind the hedge. Clustered leaves like that are a **** to shoot IMHO.


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huntersdad
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Nov 16, 2011 07:01 |  #18

I know this recommendation isn't exactly great, but why not try the battery test INSIDE? Set you batteries so that the middle is the only one in or near the center point. Shoot wide open and see want you get.


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jezzarino
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Nov 16, 2011 07:13 |  #19

I just don't understand why the 400d smokes the 7d. Even with a bad target, the 7d should have less trouble than the 400d, shouldn't it? I'd expect bad results from both on a particularly bad target.

I mean, I was amazed by the 7d a few weeks ago with its low light af. It locks stuff the 400d didn't even know about lol




  
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Nov 16, 2011 07:32 |  #20

In theory the 7D should be able to keep up and exceed the limits of the 400D - however as said try some more test shots in better conditions. Make sure that the error is repeatable and not just a one off fluke.

If its repeatable then shoot the testcharts to get an idea of the spread of the problem (use varying focal lengths on the zoom lens for this as well). From then its a case of contacting the repair shop to report your findings and situation; the more rigorous your tests are now the more info you can provide.


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paulkaye
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Nov 16, 2011 07:39 |  #21

I don't have a 7D and have never used one, so shoot me down if you will... but I've seen at least a half-dozen similar threads on 7D focus issues over the last few weeks. There are occasional ones on other cameras I admit, but the 7D seems to come up tops in the "my camera's AF doesn't work properly" hit parade. Is this really all user error, or is there some real issue with the 7D? It would be interesting to get some stats off the POTN forums (maybe I should do a poll?)


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TeamSpeed
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Nov 16, 2011 07:39 |  #22

Take the same lens and set your MA value to +14 and do the same test.

Not the best test subject material though... :)

The AF sensors on the 7D could overlap a bit, where on the XTi, they are very spread out. I would actually put the 7D on spot AF if you continue to use that material as your test subject.

Try this, put something colorful/contrasty in the yard, like a kids toy, and try the test again. Both cameras should have no issue targeting that toy amidst all the grass. This could help determine whether your lens and 7D are front or back focusing.


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Sdiver2489
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Nov 16, 2011 07:43 as a reply to  @ TeamSpeed's post |  #23

I had inconsistent AF with my lenses...less so the slower models.

I just replaced my 7D and the new one is fantastic with focusing even in the lowest of light. Personally...you sound like the position I was in. I was taking more test shots than actual pictures and when I did take a picture I wasn't sure it would turn out. So go get a replacement.


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Nov 16, 2011 07:49 |  #24

Sdiver2489 wrote in post #13406942 (external link)
I had inconsistent AF with my lenses...less so the slower models.

I just replaced my 7D and the new one is fantastic with focusing even in the lowest of light. Personally...you sound like the position I was in. I was taking more test shots than actual pictures and when I did take a picture I wasn't sure it would turn out. So go get a replacement.

Maybe this is your old 7D?!! :lol: Those darn shops that restock with customer returns!


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mckinleypics
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Nov 16, 2011 08:11 |  #25

I have a stupid question - how do people post pictures showing the af points on them?


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Hermeto
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Nov 16, 2011 08:14 |  #26
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mckinleypics wrote in post #13407040 (external link)
I have a stupid question - how do people post pictures showing the af points on them?

They post screen shots of pictures opened in programs that show AF points: Canon's DPP and ZoomBrowzer EX.


What we see depends mainly on what we look for.

  
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mckinleypics
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Nov 16, 2011 10:33 |  #27

ahhh - so wouldn't a screen shot be of reduced quality?


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Hermeto
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Nov 16, 2011 10:41 |  #28
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Well, sure, but the purpose of such shots is to illustrate focus accuracy, not sharpness.


What we see depends mainly on what we look for.

  
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SaxonIV
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Nov 16, 2011 10:51 |  #29

Are You sure sure you don't have the ad spot expansion on? It could be using the other points to help the center point




  
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Nov 16, 2011 11:07 as a reply to  @ SaxonIV's post |  #30

Use a prime (MFA), stop it down, tripod + cable release + MLU, SHOOT RAW, sharpness to 3, open in DPP.

If it is still soft then you may have an issue.


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ARGH! 7D Fail, 400D for the win!
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