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Occasional Contributor
Posts: 7
Registered: ‎01-21-2019

Canon 15-85 - left side of image is blurry

[ Edited ]

Hello there,

I recently purchased a Canon 15-85 for my Canon T7i and noticed that some of my photos taken with this lens were awfully blurry on the left side of the image as compared to the right, and I have no idea why.  Anyone have any ideas?  Is there any in-camera solution I could try, or is it a defect with the lens?  An example photo is shown below.

 

 

Taken at 1/800, f/8 at ISO200.

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Reputable Contributor
Posts: 548
Registered: ‎10-21-2016

Re: Canon 15-85 - left side of image is blurry

This is a sign of a decentred lens, nothing you can do with it apart from return it for repair or preferably a replacement.

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VIP
Posts: 13,287
Registered: ‎12-07-2012

Re: Canon 15-85 - left side of image is blurry

I don't know or think anything is wrong. Most lower priced plastic zoom lenses have some FL range where part of the image may get soft. Also barrel distortion can affect sharpness it too.  Returning it may get you another that displays the same thing.

EB
EOS 1DX and 1D Mk IV and several lenses!
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Esteemed Contributor
Posts: 4,313
Registered: ‎02-17-2016

Re: Canon 15-85 - left side of image is blurry

You seem to have this problem a lot:

https://community.usa.canon.com/t5/Lenses/Canon-18-135-sharpness-issues/m-p/264969

 

I knew I had seen that bus before.

 

BTW, the real test for testing for lens de-centering is the newspaper test:

http://www.bobatkins.com/photography/technical/lens_misalignment.html

 

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VIP
Posts: 13,287
Registered: ‎12-07-2012

Re: Canon 15-85 - left side of image is blurry

"BTW, the real test for testing for lens de-centering is the newspaper test:

http://www.bobatkins.com/photography/technical/lens_misalignment.html"

 

Great idea!  Love it.

EB
EOS 1DX and 1D Mk IV and several lenses!
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Occasional Contributor
Posts: 7
Registered: ‎01-21-2019

Re: Canon 15-85 - left side of image is blurry

Yes, I originally had that 18-135 and unfortunately a few months ago just after the pandemic started, I damaged it beyond repair.  So I purchased this lens to use as my main walk around lens.  Thanks though, I will definetely try the newspaper test when I get home to see what the results are.

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VIP
Posts: 13,287
Registered: ‎12-07-2012

Re: Canon 15-85 - left side of image is blurry

Make sure you don't confuse it with barrel distortion.  These types of lenses are prone to at least some degree of distortion. And, that can not be corrected in the lens but can be edited in post by software like PS.

 

If a lens like the 15-85mil gets bumped or dropped even a little it can decenter its optics. 

EB
EOS 1DX and 1D Mk IV and several lenses!
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Respected Contributor
Posts: 1,181
Registered: ‎01-25-2018

Re: Canon 15-85 - left side of image is blurry

I agree with KV, you need to shoot a photo with a flat plane focal object across the width of the frame to see whether the lens has an issue.

 

The EF 400 f2.8 is the most expensive lens I own and I am confident it is in great optical shape but this photo shows the results when eye catching subjects are at radically different distances from the plane of the image sensor with a shallow depth of field.  I suspect if you shot a scene like this one with your lens you would also find sharply focused grass across the width of the frame.

 

Rodger

 

AS0I1156.JPG

EOS 1DX M3, 1DX M2, 1DX, 5DS R, 1D M2, EOS 650 (film), many lenses, XF400 video
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Esteemed Contributor
Posts: 2,566
Registered: ‎11-19-2017

Re: Canon 15-85 - left side of image is blurry

[ Edited ]

Rodger,

Agree.  Here's another example of that.

 

85mm, f2.8, 1/200, ISO 4000

 

Subjects in middle of photo.  f2.8 foreground and background are blurred.  

Test1.JPG

~Rick
Bay Area - CA
~6D2 ~Many Lenses ~DxO PhotoLab Elite ~Windows10 Pro ~EVGA RTX 2080 FTW3 Ultra ~Pixma Pro-100
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VIP
Posts: 10,710
Registered: ‎08-13-2015

Re: Canon 15-85 - left side of image is blurry

I don't think there is anything wrong with the original sample shot.  Nothing, at all.  It is a consumer lens.  

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