EF-M 15-45 ... sometimes soft side of the image

Started 2 months ago | Questions
toomix Regular Member • Posts: 118
EF-M 15-45 ... sometimes soft side of the image

I know, a lot of debate has been done about this lens. In general, I'm happy with it but I have noticed that sometimes (maybe 30% of the cases) it has left side of the image rather soft. There is no pattern in focal length, aperture, or focusing distance ... does anybody experience the same issue, please?

Other shots are perfectly sharp ...

thanks

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Canon EOS M100 Fujifilm X-T30 Canon EF 35mm F2.0 Canon EF-S 15-85mm f/3.5-5.6 IS USM Canon EF 100mm f/2.8 Macro USM +14 more
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nnowak Veteran Member • Posts: 6,963
Re: EF-M 15-45 ... sometimes soft side of the image
2

toomix wrote:

I know, a lot of debate has been done about this lens. In general, I'm happy with it but I have noticed that sometimes (maybe 30% of the cases) it has left side of the image rather soft. There is no pattern in focal length, aperture, or focusing distance ... does anybody experience the same issue, please?

Other shots are perfectly sharp ...

thanks

What you are describing is the typical decentering issue that has afflicted many copies of the 15-45mm.  This issue tends to be more apparent when shooting on the wide end with the aperture wide open.

KevinRA Contributing Member • Posts: 644
Re: EF-M 15-45 ... sometimes soft side of the image
3

toomix wrote:

I know, a lot of debate has been done about this lens. In general, I'm happy with it but I have noticed that sometimes (maybe 30% of the cases) it has left side of the image rather soft. There is no pattern in focal length, aperture, or focusing distance ... does anybody experience the same issue, please?

Other shots are perfectly sharp ...

thanks

Try shooting 45 degrees like a newspaper - and see if the depth of field is linear or if the lens is tilted. If slightly tilted, the large depth of field may mean that the image is sharp across the frame in some shots if optimum focussed but not in others. Another test is to set up objects a different distances from the camera across the frame - is the plane of focus a constant difference?  I have this issue to a slight degree in my 15-45 (I tolerate it) but not as bad as a sigma 56mm at f/1.4, a canon 15-85 (which was bad even at f/8) or more surprisingly a 2nd hand 60mm macro.

Try some tests and see?

https://www.lensrentals.com/blog/2016/11/fun-with-field-of-focus-ii-copy-to-copy-variation-and-lens-testing/

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R2D2 Forum Pro • Posts: 21,710
Re: EF-M 15-45 ... sometimes soft side of the image
2

toomix wrote:

I know, a lot of debate has been done about this lens. In general, I'm happy with it but I have noticed that sometimes (maybe 30% of the cases) it has left side of the image rather soft. There is no pattern in focal length, aperture, or focusing distance ... does anybody experience the same issue, please?

Other shots are perfectly sharp ...

thanks

+1 Bad copy.  If you just got it, exchange it.  If it's still under warranty, send it in (you'll receive a different one).

Best of luck!

R2

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plantdoc Veteran Member • Posts: 3,819
Re: EF-M 15-45 ... sometimes soft side of the image
1

15-85. Took me 3 tries to get one without decentering. 15-45 decentered and returned. 18-55 M exchanged. Other experiences as well. I am also not ultra picky either and willing to stop down for a fix. Frustrating problem.

greg

nnowak Veteran Member • Posts: 6,963
Re: EF-M 15-45 ... sometimes soft side of the image

plantdoc wrote:

15-85. Took me 3 tries to get one without decentering. 15-45 decentered and returned. 18-55 M exchanged. Other experiences as well. I am also not ultra picky either and willing to stop down for a fix. Frustrating problem.

greg

The 15-85mm also took me 3 try for the same reason.  My only copy of the 15-45mm is badly decentered.  I did manage to get a really good copy of the 18-55 on my first try, but sold it years ago.

Alexis
Alexis Senior Member • Posts: 1,688
Re: EF-M 15-45 ... sometimes soft side of the image
1

I was one of the lucky one - I have a good copy 1st time around.

Don't give up on this lens as a good copy is a surprising capable lens

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immortalstrong New Member • Posts: 23
Re: EF-M 15-45 ... sometimes soft side of the image

My 1st 15-45 had the same issue. The upper left side of becomes fuzzy due to the decentering issue. I had it replaced so my new 15-45 copy is now pretty sharp.

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Canon EOS M100 Canon EF-M 22mm f/2 STM Canon EF-M 55-200mm f/4.5-6.3 IS STM Canon EF 50mm F1.8 STM Canon EF-M 15-45mm F3.5-6.3 IS STM
davev8
davev8 Veteran Member • Posts: 3,975
Re: EF-M 15-45 ... sometimes soft side of the image

KevinRA wrote:

toomix wrote:

I know, a lot of debate has been done about this lens. In general, I'm happy with it but I have noticed that sometimes (maybe 30% of the cases) it has left side of the image rather soft. There is no pattern in focal length, aperture, or focusing distance ... does anybody experience the same issue, please?

Other shots are perfectly sharp ...

thanks

Try shooting 45 degrees like a newspaper - and see if the depth of field is linear or if the lens is tilted. If slightly tilted, the large depth of field may mean that the image is sharp across the frame in some shots if optimum focussed but not in others. Another test is to set up objects a different distances from the camera across the frame - is the plane of focus a constant difference? I have this issue to a slight degree in my 15-45 (I tolerate it) but not as bad as a sigma 56mm at f/1.4, a canon 15-85 (which was bad even at f/8) or more surprisingly a 2nd hand 60mm macro.

would not decentering be easier to spot  if the camera was set up perfectly square on a tripod to say a news paper taped to a wall  with the lens wide open ???

Try some tests and see?

https://www.lensrentals.com/blog/2016/11/fun-with-field-of-focus-ii-copy-to-copy-variation-and-lens-testing/

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Attention Dislexsic i mean dyslexic person... This post will have many although spell checked, spelling and grammatical errs ..its The best its going get so no need to tell me it is bad I know it is .....................................................................................................
My 5D IS a MK1 classic
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There is no argument for FF vs APS-c (or m43) with shallow DOF..as it's a law of physics and a very subjective personal thing if you want to make use of the shallow DOF only FF can offer
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If you wait for a camera that will  tick all your boxes ....by then you will have more boxes to tick..... so the wait continues .....David Appleton

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R2D2 Forum Pro • Posts: 21,710
Re: EF-M 15-45 ... sometimes soft side of the image

davev8 wrote:

KevinRA wrote:

toomix wrote:

I know, a lot of debate has been done about this lens. In general, I'm happy with it but I have noticed that sometimes (maybe 30% of the cases) it has left side of the image rather soft. There is no pattern in focal length, aperture, or focusing distance ... does anybody experience the same issue, please?

Other shots are perfectly sharp ...

thanks

Try shooting 45 degrees like a newspaper - and see if the depth of field is linear or if the lens is tilted. If slightly tilted, the large depth of field may mean that the image is sharp across the frame in some shots if optimum focussed but not in others. Another test is to set up objects a different distances from the camera across the frame - is the plane of focus a constant difference? I have this issue to a slight degree in my 15-45 (I tolerate it) but not as bad as a sigma 56mm at f/1.4, a canon 15-85 (which was bad even at f/8) or more surprisingly a 2nd hand 60mm macro.

would not decentering be easier to spot if the camera was set up perfectly square on a tripod to say a news paper taped to a wall with the lens wide open ???

Works fine.  I usually do the brick wall test though (in the shade).

R2

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KevinRA Contributing Member • Posts: 644
Re: EF-M 15-45 ... sometimes soft side of the image

davev8 wrote:

KevinRA wrote:

toomix wrote:

I know, a lot of debate has been done about this lens. In general, I'm happy with it but I have noticed that sometimes (maybe 30% of the cases) it has left side of the image rather soft. There is no pattern in focal length, aperture, or focusing distance ... does anybody experience the same issue, please?

Other shots are perfectly sharp ...

thanks

Try shooting 45 degrees like a newspaper - and see if the depth of field is linear or if the lens is tilted. If slightly tilted, the large depth of field may mean that the image is sharp across the frame in some shots if optimum focussed but not in others. Another test is to set up objects a different distances from the camera across the frame - is the plane of focus a constant difference? I have this issue to a slight degree in my 15-45 (I tolerate it) but not as bad as a sigma 56mm at f/1.4, a canon 15-85 (which was bad even at f/8) or more surprisingly a 2nd hand 60mm macro.

would not decentering be easier to spot if the camera was set up perfectly square on a tripod to say a news paper taped to a wall with the lens wide open ???

Works well for a f/1.4 lens to see if a problem but wont diagnose it the cause and may not be repeatable in slight tilt case. The OP here says 70% of the time their lens is OKish at least. Depth of field depending on focussing may be enough to cover a slight tilt depending on exact focus point - whereas a test looking at where the optimum focus point is should diagnose the issue.  E.g. is the plane of focus not flat - or in a true de-centred lens, is the left side soft however focussed..  The latter always an issue, the former YMMV...  Just looking at the OP's problem.

Try some tests and see?

https://www.lensrentals.com/blog/2016/11/fun-with-field-of-focus-ii-copy-to-copy-variation-and-lens-testing/

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davev8
davev8 Veteran Member • Posts: 3,975
Re: EF-M 15-45 ... sometimes soft side of the image

KevinRA wrote:

davev8 wrote:

KevinRA wrote:

toomix wrote:

I know, a lot of debate has been done about this lens. In general, I'm happy with it but I have noticed that sometimes (maybe 30% of the cases) it has left side of the image rather soft. There is no pattern in focal length, aperture, or focusing distance ... does anybody experience the same issue, please?

Other shots are perfectly sharp ...

thanks

Try shooting 45 degrees like a newspaper - and see if the depth of field is linear or if the lens is tilted. If slightly tilted, the large depth of field may mean that the image is sharp across the frame in some shots if optimum focussed but not in others. Another test is to set up objects a different distances from the camera across the frame - is the plane of focus a constant difference? I have this issue to a slight degree in my 15-45 (I tolerate it) but not as bad as a sigma 56mm at f/1.4, a canon 15-85 (which was bad even at f/8) or more surprisingly a 2nd hand 60mm macro.

would not decentering be easier to spot if the camera was set up perfectly square on a tripod to say a news paper taped to a wall with the lens wide open ???

Works well for a f/1.4 lens to see if a problem but wont diagnose it the cause and may not be repeatable in slight tilt case. The OP here says 70% of the time their lens is OKish at least. Depth of field depending on focussing may be enough to cover a slight tilt depending on exact focus point - whereas a test looking at where the optimum focus point is should diagnose the issue. E.g. is the plane of focus not flat - or in a true de-centred lens, is the left side soft however focussed.. The latter always an issue, the former YMMV... Just looking at the OP's problem.

i think if you have a lens that its decentering is hidden at F3.5/wide open  you will never notice it in real world photos ...if you got very technical at looking for it you probably want find any cheap kit lenses that are perfect

Try some tests and see?

https://www.lensrentals.com/blog/2016/11/fun-with-field-of-focus-ii-copy-to-copy-variation-and-lens-testing/

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.
.
.
Attention Dislexsic i mean dyslexic person... This post will have many although spell checked, spelling and grammatical errs ..its The best its going get so no need to tell me it is bad I know it is .....................................................................................................
My 5D IS a MK1 classic
.........................................................................................................
There is no argument for FF vs APS-c (or m43) with shallow DOF..as it's a law of physics and a very subjective personal thing if you want to make use of the shallow DOF only FF can offer
.....................................................................................................
If you wait for a camera that will  tick all your boxes ....by then you will have more boxes to tick..... so the wait continues .....David Appleton

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Canon EOS Rebel SL1 Canon EOS 5D Nikon D70s Sony Alpha NEX-C3 Canon EOS M5 +9 more
KevinRA Contributing Member • Posts: 644
Re: EF-M 15-45 ... sometimes soft side of the image

davev8 wrote:

KevinRA wrote:

davev8 wrote:

KevinRA wrote:

toomix wrote:

I know, a lot of debate has been done about this lens. In general, I'm happy with it but I have noticed that sometimes (maybe 30% of the cases) it has left side of the image rather soft. There is no pattern in focal length, aperture, or focusing distance ... does anybody experience the same issue, please?

Other shots are perfectly sharp ...

thanks

Try shooting 45 degrees like a newspaper - and see if the depth of field is linear or if the lens is tilted. If slightly tilted, the large depth of field may mean that the image is sharp across the frame in some shots if optimum focussed but not in others. Another test is to set up objects a different distances from the camera across the frame - is the plane of focus a constant difference? I have this issue to a slight degree in my 15-45 (I tolerate it) but not as bad as a sigma 56mm at f/1.4, a canon 15-85 (which was bad even at f/8) or more surprisingly a 2nd hand 60mm macro.

would not decentering be easier to spot if the camera was set up perfectly square on a tripod to say a news paper taped to a wall with the lens wide open ???

Works well for a f/1.4 lens to see if a problem but wont diagnose it the cause and may not be repeatable in slight tilt case. The OP here says 70% of the time their lens is OKish at least. Depth of field depending on focussing may be enough to cover a slight tilt depending on exact focus point - whereas a test looking at where the optimum focus point is should diagnose the issue. E.g. is the plane of focus not flat - or in a true de-centred lens, is the left side soft however focussed.. The latter always an issue, the former YMMV... Just looking at the OP's problem.

i think if you have a lens that its decentering is hidden at F3.5/wide open you will never notice it in real world photos ...if you got very technical at looking for it you probably want find any cheap kit lenses that are perfect

I'm sure to a degree you're right, but have tried this casually on plenty lenses in time - and most seem to "pass" for me Ok including the old kit EFS-18-55 I had....

Out of all the lenses I've tried, only ones with issues have been canon 15-85 (even at f/11), sigma 56mm f/1.4 (fine by ~f/4), sigma 10-20 (dreadful, long time ago), 16-35L (at > 28mm but OK at f/9ish) and just lately a canon 60mm macro (used copy and looks like decentring not tilt I think). My 15-45 EF-M is not far off (and neither was the 1st copy I had to return as was part of a faulty M6II kit).  All others never noticed a problem at all.   The 56mm for example fails a brick wall test - but actually is fine in most use - as normally at wide apertures only the subject (e.g. part of the frame) is in focus anyway - so even if at edge of frame then fine. The 10-20 though would require a stack, even to get a sharp shot at f/11 cross the frame.

Try some tests and see?

https://www.lensrentals.com/blog/2016/11/fun-with-field-of-focus-ii-copy-to-copy-variation-and-lens-testing/

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OP toomix Regular Member • Posts: 118
Re: EF-M 15-45 ... sometimes soft side of the image

I have got EF-S 15-85 constantly sharp on the first run, never had problems with Canon lenses until this 15-45. But I guess decentering should be always present, but I have shots in same conditions where once it is present and in second case it is not

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Canon EOS M100 Fujifilm X-T30 Canon EF 35mm F2.0 Canon EF-S 15-85mm f/3.5-5.6 IS USM Canon EF 100mm f/2.8 Macro USM +14 more
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