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Author Topic: 7D - I'm goin' nuts with focus  (Read 3135 times)

CharlieB

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7D - I'm goin' nuts with focus
« on: October 24, 2012, 09:50:43 PM »
Got a 7D.  New.

It came with 2.0.3 - but I'm not going to blame the firmware.

I like to shoot fast lenses, and shoot them close to, or at wide open.

28/1.8 at f/2 - close distance - five feet or so... backfocus.  At 30 feet - front focus.
50/1.4 at f/2 - same thing
100/2.8 macro - same thing

I'm talking a shift of "-7" at close distance, to +4 at further distances, and +9 at close to infinity distances (300 feet or so).

I'm basically... going nuts here.

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7D - I'm goin' nuts with focus
« on: October 24, 2012, 09:50:43 PM »

CharlieB

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Re: 7D - I'm goin' nuts with focus
« Reply #1 on: October 24, 2012, 09:52:09 PM »
Should also say, the 5DmkII is not having a problem with those lenses.  I have - 3 set on the 50, 0 on the 28, and 0 on the 100, and they track linearly close to far.

This has got to be a body issue.

Mt Spokane Photography

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Re: 7D - I'm goin' nuts with focus
« Reply #2 on: October 24, 2012, 10:03:16 PM »
Typically, at distances near mfd, lens AF changes.  However, 5 ft with a 28mm lens should not change that much.
It should not be that bad for three lenses.

CharlieB

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Re: 7D - I'm goin' nuts with focus
« Reply #3 on: October 24, 2012, 10:19:13 PM »
Just tested live view... focus perfect, of course.

I better call Canon tomorrow

neuroanatomist

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Re: 7D - I'm goin' nuts with focus
« Reply #4 on: October 24, 2012, 10:22:51 PM »
My 100L Macro on my 7D was +1 near the MFD, +3 at 8 feet, and +2 at 16 feet.

I agree - call Canon.
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CharlieB

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Re: 7D - I'm goin' nuts with focus
« Reply #5 on: October 24, 2012, 10:47:24 PM »
were they able to correct?

K3nt

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Re: 7D - I'm goin' nuts with focus
« Reply #6 on: October 25, 2012, 04:10:57 AM »
Don't go nuts, it tends to distract from the rest of your life.  ;D

When I got my 7D, at first I didn't notice, but slowly as I expanded with more lenses I noticed the focus was off. Took the whole lot in to the service center and they calibrated all of it in a few days and it's been perfect ever since, now if I miss a shot it is due to my own clumsiness and not that the camera wouldn't work. :)
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Re: 7D - I'm goin' nuts with focus
« Reply #6 on: October 25, 2012, 04:10:57 AM »

CharlieB

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Re: 7D - I'm goin' nuts with focus
« Reply #7 on: October 25, 2012, 02:31:53 PM »
One more test... tonight.

I don't want Canon to touch the lenses, they've never had an issue on other bodies, including my 5DmkII.

Just the 7D body - is nutz.  Or I'm nutz

ck5dmkiii

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Re: 7D - I'm goin' nuts with focus
« Reply #8 on: October 25, 2012, 03:37:41 PM »
My 7D had a world of problems with my 50L and 70-200 2.8II I previously owned. I went crazy trying to figure out the issue. Ended up sending it to Canon a few times with all my lenses to get it sorted out. Good luck and hope it works out :)
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ishdakuteb

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Re: 7D - I'm goin' nuts with focus
« Reply #9 on: October 25, 2012, 03:46:14 PM »
don't have the other two lenses, but i do not have problem with my 50mm f/1.4 with my 7d, even on my 30d.  have not yet tried to put it on 5d iii...

marek.sykora

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Re: 7D - I'm goin' nuts with focus
« Reply #10 on: October 25, 2012, 04:17:36 PM »
I own 7D since April, before I had 30D and before analog 33. I own 20/2.8, 28/1.8 and 85/1.8 all time.

- in analog ages I considered 85 is superb, 20 and 28 great
- in 30D ages 85 was superb, 20 still great but 28 was average/poor, esp. at low apertures

Before microadjustment all my lenses was worse on 7D than on 30D.

After MA:

- 85 is superb at f/2.2 - f/11, I can see poor quality wide open and also f/16+ due diffraction
- 28 is superb at f/2.2 - f/5.6 on near distances, wow, but still average/poor on infinity
- 20 is poor until f/4 in all distances, average at f/5.6 - f/11

7D is great, but all my lenses need MA around -8. I didn't find how to set 28/1.8 to be great on infinity, I guess it's not designed to be landspace lens, but low-light street/portret photo. I love my 28/1.8 since having 7D and MA.

I think my lenses are quite old, I tried 17-55/2.8 for two days and I was so suprised how good is the zoom both in IQ and AF accurance/speed terms.

Jackson_Bill

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Re: 7D - I'm goin' nuts with focus
« Reply #11 on: October 25, 2012, 07:05:12 PM »
I've been experiencing something similar with my (old) 70-200 2.8. I'd be very interested in hearing how things work out for you.

CharlieB

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Re: 7D - I'm goin' nuts with focus
« Reply #12 on: October 26, 2012, 10:10:50 PM »
Might have gotten it fixed.

The 28/1.8 was goin' bonkers, and my other lenses were not immediately available.....

Well, the 28/1.8 finally quit completely.  Refused to focus.  Remounted the lens.  Nada.  Cleaned contacts on lens and body, and... it started focusing, AND focusing pretty well too.

Tonite, it seems to like a -2.  All the lenses seem to like -2, except the 100/2.8USM which I haven't tested yet, and the 24-105 which likes a +2. 

But... IMPORTANTLY, it seems like the linearity of things has settled down considerably.  I had some issues with the 5DmkII as well... contacts not right, causing problems in operation.  That cleared up with a little use.  I guess the 7D needed some help.

I'm still testing.  I need some daylight to really give it a proper test.... more tomorrow.

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Re: 7D - I'm goin' nuts with focus
« Reply #12 on: October 26, 2012, 10:10:50 PM »

CharlieB

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7D "driving me nuts" -- more to it!!!!
« Reply #13 on: October 28, 2012, 09:52:56 PM »
So, the 7D is fine.

This is what I have found out, and I'd have not guessed this in a million years.

IF I pull the CF card, or IF I power down, and I DON'T use the 28mm/1.8, the 50/1.4 and 100/2.8USM are fine, as also are the slower zooms.

BUT

IF I mount the 28/1.8 it works like crap, and if I mount the 50/1.4 or 100/2.8USM after that without powering down or pulling the card (which powers down), the 28/1.8 sours the focus system for the other lenses, throwing their "linearity" from close to far, all to hell.

So.. .how in the heck am I gonna explain, and convince Canon about THAT problem....   

I tested this on my 5DmkII, and the same thing happens.  Its a poison lens.... that 28/1.8.

Funny it worked GREAT on my 400D

I gotta think on this a bit... may be better to just get a new lens.

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7D "driving me nuts" -- more to it!!!!
« Reply #13 on: October 28, 2012, 09:52:56 PM »