7D focusing question

tolyD wrote in post #10161435
Its like buying a new car with terrible alignment.

A very good analogy since I've had that happen to me as well. It was very annoying but I had it fixed under warranty then drove the car 250,000 miles in 4 years with no repair work except for a couple of oil changes. Yes, you read that right.

jwcdds wrote in post #10161509
Meh. I certainly am not defending Canon but this is just the nature of electronics. Besides, we don't know if it's the 7D or if it's the 28-135. microadjusting lenses isn't difficult. But if you don't want to be bothered with it, then return it to the store.

most likely its the lens since the rental seemed to be in good focus. I wish i have checked the live view focus on the rental one while i've had it before i returned it. I can't return this one back to the store, the 14day BestBuy policy has expired

krb wrote in post #10161557
A very good analogy since I've had that happen to me as well. It was very annoying but I had it fixed under warranty then drove the car 250,000 miles in 4 years with no repair work except for a couple of oil changes. Yes, you read that right.

I hope my camera will end up just like your car

I think I'm might be having the same issues.

This one local place told me they can calibrate the lens for 75 bucks. Is it fair price??? seems a lot for tweeking few dials.

it might help.... https://photography-on-the.net/forum/showthre​ad.php?t=870445

krb wrote in post #10161557
A very good analogy since I've had that happen to me as well. It was very annoying but I had it fixed under warranty then drove the car 250,000 miles in 4 years with no repair work except for a couple of oil changes. Yes, you read that right.

How'd you manage 250,000 miles on the orignal set of tires as well as none of the 60k/120k kind of repair?

tolyD wrote in post #10163423
This one local place told me they can calibrate the lens for 75 bucks. Is it fair price??? seems a lot for tweeking few dials.

If you've purchased the lens and camera within a year's time you can send it to canon and they can inspect and calibrate it at no charge to you except shipping.

Try using my chart, it might help you adjust your lenses. If not, you are out just 2 sheets of paper and some time.
https://photography-on-the.net …50736&highlight​=diy+focus

I scanned through this thread I don't recall anyone mentioning where in the manual, how to adjust the your lens is. Page 211, I found it the hard way. $75 doesn't appear to bad to set the lens, it took me a couple of hours to set one of mine, one has to adjust and check a few times before one gets the right focus, that is assuming that is the problem. Paying someone to set it takes the fun out of it though.

millwright wrote in post #10165038
I scanned through this thread I don't recall anyone mentioning where in the manual, how to adjust the your lens is. Page 211, I found it the hard way.

Hard way? What's so hard about using the index at the back of the book?

Live view focus works by adjusting the lens until the image looks sharp on the image sensor. Since that's the same sensor as registers your pictures, if one is sharp, the other is too.
The normal AF system works with a separate sensor, hence bad alignment of that sensor may cause out of focus images. The same can happen if the lens isn't properly calibrated.

Focusing works the same in P mode as in Av or M or whatever. Only preprogrammed modes, like the green box, are different.
All focusing is done with the aperture wide open, so live view focus differs only if the max opening is smaller than f/5.6. It usually is not, but may be, if you have extenders on slow lenses.

Microadjustment can only change one thing for a lens. A zoom lens calibrated at a repair center is adjusted at eight different points. Don't expect micro adjustment to solve your problem. If it does, it often solves it at a certain focal length, a certain distance to the subject and sometimes even under certain lighting conditions. In other conditions, it may even make things worse.
But if it does solve one problem, it will at least indicate if your lens/camera needs calibration.

Poe wrote in post #10164140
How'd you manage 250,000 miles on the orignal set of tires as well as none of the 60k/120k kind of repair?

Rather off topic, but buy a car with a timing chain rather than belt, and likely (very) it'd be an automatic. The tires, they'd have to be changed.

apersson850 wrote in post #10166083
Live view focus works by adjusting the lens until the image looks sharp on the image sensor. Since that's the same sensor as registers your pictures, if one is sharp, the other is too.
The normal AF system works with a separate sensor, hence bad alignment of that sensor may cause out of focus images. The same can happen if the lens isn't properly calibrated.

Focusing works the same in P mode as in Av or M or whatever. Only preprogrammed modes, like the green box, are different.
All focusing is done with the aperture wide open, so live view focus differs only if the max opening is smaller than f/5.6. It usually is not, but may be, if you have extenders on slow lenses.

Microadjustment can only change one thing for a lens. A zoom lens calibrated at a repair center is adjusted at eight different points. Don't expect micro adjustment to solve your problem. If it does, it often solves it at a certain focal length, a certain distance to the subject and sometimes even under certain lighting conditions. In other conditions, it may even make things worse.
But if it does solve one problem, it will at least indicate if your lens/camera needs calibration.

Im sending my camera to Canon today and have them fix the problem. I did so many tests and I have used the chart posted above. Something is wrong there, i can never get focus as sharp as with AF Live and manual focus with Live view gets even a bit better. When i called Canon last night, representative told me to send it in. Hopefully they can fix this.

millwright wrote in post #10165038
I scanned through this thread I don't recall anyone mentioning where in the manual, how to adjust the your lens is. Page 211, I found it the hard way. $75 doesn't appear to bad to set the lens, it took me a couple of hours to set one of mine, one has to adjust and check a few times before one gets the right focus, that is assuming that is the problem. Paying someone to set it takes the fun out of it though.

I dont want to mess with it on my own and make things worse then they are.