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Thread started 12 Nov 2014 (Wednesday) 14:59
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7D Mark II - Focus Discussions

 
Kickflipkid687
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Nov 12, 2014 14:59 |  #1

Hey guys,

Some of you probably saw my posts in the main 7D II thread, but I wanted to break this out into a new thread, to easily talk about and track this stuff.

If you don't know, I'm on my second 7D II body right now, since the first one was randomly front/back focusing on a static target, in One Shot, on a tripod, with mirror lockup/ect.

I went back and forth with my 60D and multiple lesnes for 2-3 hours and finally decided it was "defective" and swapped it out.

So far my second body seems to be totally fine. But I need to take it out this weekend and do some "real" shooting with it (wildlife) to be sure it's good.

I'll report my findings. But I'm curious to see who else has been noticing issues, or has returned/swapped theirs out as well?


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Keyan
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Nov 12, 2014 15:08 |  #2

Thanks for starting this.

For those who didn't see it, a couple of users have reported the focus "rocking" in AI Servo and even in one shot on the same target it will vary randomly between on target, front, and back focusing. The focus doesn't "hit" consistently so you can't just MFA it out - it will be off in one direction or the other randomly with the same lens on the same subject.

Two of the users both got theirs from B&H, so it makes you wonder if there is a batch problem with a set of 7D2s.

My copy from Adorama does not do this - it hits consistently with focus (some lenses might require small MFA adjustments, but the camera hits a static target identically between focus lock ons after forcing it out of focus).


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Archibald
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Nov 12, 2014 15:13 |  #3

Good to have this thread. Subscribed.


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ksbal
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Nov 12, 2014 15:36 |  #4

subscribed also - but I'm thinking mine is all operator and learning the camera, should know more after this weekend.


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moltengold
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Nov 12, 2014 15:44 |  #5

can anyone explain to me what is front and back focusing means ?
Thanks


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Kickflipkid687
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Nov 12, 2014 15:47 |  #6

moltengold wrote in post #17268039 (external link)
can anyone explain to me what is front and back focusing means ?
Thanks

You focus on a specific point, that the camera says is "in focus" or what should be in focus. But it's actually focused infront of or behind what you actually wanted.

This could be only millimeters in difference. Or inches/feet, depending on the distance you are from the subject. It depends how far off the camera/lenses are in calibration.


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Tom_D
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Nov 12, 2014 15:49 |  #7

moltengold wrote in post #17268039 (external link)
can anyone explain to me what is front and back focusing means ?
Thanks

http://cameralightlens​.com/newsblog/?p=264 (external link)


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moltengold
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Nov 12, 2014 15:53 |  #8

Thanks a lot all
but if I have a great DOF when I shoot at f/8 and more
this issue will be nothing ? Right ?


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Kickflipkid687
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Nov 12, 2014 15:55 |  #9

moltengold wrote in post #17268054 (external link)
Thanks a lot all
but if I have a great DOF when I shoot at f/8 and more
this issue will be nothing ? Right ?

Depends on the focal length. If you're using a wider angle lens, you may or may not notice it as much.

But with my 600mm lens, even at F/8, DOF can be inches wide. So if my focus is off by millimeters or an inch, it's noticeable.
Also depends on the distance to the subject too.


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moltengold
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Nov 12, 2014 15:59 |  #10

Thanks for the info
I must study and learn about all of these information
I'm shooting in small and very close distance with macro photos
that's why I don't know so much about all of these information
Thanks again


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Kickflipkid687
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Nov 12, 2014 16:02 |  #11

Ah. If you are manually focusing, it's not as big of a deal, but still worth checking out/knowing how it works.

But, if you are using AF to do your macro, then you could/would definitely notice it/have issues.


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John
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Nov 12, 2014 16:11 |  #12

Had to set my 50mm 1.4 to +15 MFA. Which was a little surprising.

24-70 2.8 II and 70-200 2.8 IS II were pretty much spot on, maybe +1 for the 24-70.


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moltengold
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Nov 12, 2014 16:11 |  #13

Thanks a lot
that's why I didn't notice any thing with all the bodies I have tried because I'm using manual focusing with macro


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Bianchi
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Nov 12, 2014 16:14 |  #14

Kickflipkid687 >>>Looks like you are all squared away getting your second copy.. Best of luck this weekend. Let us know how things go...


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Kickflipkid687
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Nov 12, 2014 16:21 |  #15

Bianchi wrote in post #17268106 (external link)
Kickflipkid687 >>>Looks like you are all squared away, getting your second copy.. Best of luck this weekend. Let us know how things go...

Thanks! Yeah, was testing last night and this morning again. So far it "seems" about spot on. At least compared to my 60D.

Actually in lower light, my 60D couldn't find/lock focus in AI Servo, but the Mark II did, and managed it pretty quick! So that is encouraging.


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7D Mark II - Focus Discussions
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