85mm 1.8 just returned from Canon WTF!

Ok so I finally ordered my 85MM 1.8 a while back determined it was back focusing really bad.
No big deal I filled out warranty claim and shipping, repair, and returned shipping only took 11 DAY!! WOW I am a happy camper right? WRONG!
The repair paperwork said that they found the lens to front focus and repaid the issue. Well thats all fine and dandy until I do some quick test shots only to find out that it STILL back focuses. Who wants a super sharp, very wide lens that doesn't focus where you want it too?
I have done a very controlled focus test and here is my results. I set up my tripod, got it set to the MFD, and use a digital angle finder to get the lens set exactly to 44.9 degrees from paper.

The paper work from Canon said if I still have a problem return the lens, my camera, and a sample image file.
What do you guys think? Should I send it all back to them? I am afraid my lens and camera will return in good focusing condition but my other lenses that are tack sharp may not focus correctly.

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BigAlz1 wrote in post #8110742
I have done a very controlled focus test and here is my results. I set up my tripod, got it set to the MFD, and use a digital angle finder to get the lens set exactly to 44.9 degrees from paper.

Allow me express doubts how controlled the shot was: The image is skewed very badly. Also the exact 45 degree is not required, only if you need exact amount of misfocus.
Nevertheless the lens does seem to backfocus. I found that a trip to Canon service does not guarantee that the lens was actually looked into. So I would call the customer service right away and asked them to redo the job.

vadim_c wrote in post #8110990
Allow me express doubts how controlled the shot was: The image is skewed very badly.

It looks to me like it's actually two separate images, not one "skewed" one.

vadim_c wrote in post #8110990
Also the exact 45 degree is not required, only if you need exact amount of misfocus....

I could be wrong, but I'm guessing that's exactly what he was testing for in those shots.

Does look like it's back focusing, though.

Sorry yes they are two different shots, one that was centered (bottom half) and one that I moved AF point down to show how the words came into focus.

I should have explained that when I posted it. I can give each of the results separately I was just trying to save space and distance between comparison.

Veemac wrote in post #8111007
It looks to me like it's actually two separate images, not one "skewed" one.

I could be wrong, but I'm guessing that's exactly what he was testing for in those shots.

Does look like it's back focusing, though.

Reading problem:

Definitions of skew on the Web:

• turn or place at an angle; "the lines on the sheet of paper are skewed"

I see how the original pic would be distracting so I replaced it with just the test shot.

BigAlz1 wrote in post #8111065
I see how the original pic would be distracting so I replaced it with just the test shot.

Which is much better than the original one, almost no misfocus at all

vadim_c, The shots are as close to aligned as I can get with out some sort of micro adjustments gear tripod that can shift the camera in X,Y, and Z, axis. I don't even know of a commonly available camera mount like that. However, the lines you are talking about are the ones moving away from the camera on a plain due to the perspective and angle of the camera placement (railroad effect). but ARE inline with the camera. Sure it's not accurate to the nano meter but it isn't skewed and its good enough for this test.
The original crop left off the left hand side so you couldn't tell that it WAS NOT skewed so I do understand why you thought that and I replaced the image.

BigAlz1 wrote in post #8111118
vadim_c, The shots are as close to aligned as I can get with out some sort of micro adjustments gear tripod that can shift the camera in X,Y, and Z, axis. I don't even know of a commonly available camera mount like that. However, the lines you are talking about are the ones moving away from the camera on a plain due to the perspective and angle of the camera placement (railroad effect). but ARE inline with the camera. Sure it's not accurate to the nano meter but it isn't skewed and its good enough for this test.
The original crop left off the left hand side so you couldn't tell that it WAS NOT skewed so I do understand why you thought that and I replaced the image.

It is not about perspective: The left half of the image should be exact reflection of the right one. The orinal images were too bad, Now it is much better, but still move the camera a little to the right. See how the ammount fo misfocus on the left and right hand differs ? I have a suspicion that Canon did a good job this time.

Same image lol,
Here is a "real" world shot to show how I can't take sharp pictures like I need too.
This is a tripod mounted shot. The knee I focused on is the furthest point toward me. The other knee, crouch and hand that are in focus are 1 and 1/2 inches away from my focus point! The subject is about 35 inches away from the camera.

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I measured from the knee to the computer desk (the part that is sharply in focus) and it is 1 1/2 inches behind my focus spot. Also look at the toes on the left leg they start to get out of focus closer it get to the plain of the focus point. All my other lenses focus and bring the intended knee into sharp focus. I use this book holder to test all my lenses from my computer chair.

So what is an acceptable amount of B/F focusing? If you are 2mm off is that really going to pose a problem when the DOF is greatly more? Just questioning. My 85 shows about 2mm back focus but in real world the images are tack sharp. I can see where this may be more of a problem with a macro lens. Maybe I am not looking at it correctly.

Same shot taken right after the one posted with my 17-55mm, still think it doesn't back focus?

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And again w7cma I said I looked at the photo and measured from where the af point was to where it was tack sharp and it was about 1 and 1/2 inches, thats over 25mm.

Just look at the two images, if no one else can not see a MAJOR back focus difference then I am heading to the eye doctor tomorrow!

Oh I can see your lens has a problem, I was referring to mine with just 2mm of error. 1 1/2 inches is a lot.