EOS M50 out of focus

[NickSlav]

here wo go again (((((( I have an issue with my m50. i made a studio shoot with sigma 18-35 with original canon adapter (manual mode iso100 1/200 f2.5) with narural light, and i noticed that raws miss detalization and they are back focused (((( Leens have been tested on many bodies and it works fine. Canon DPP show focus point on face. What is the problem can be? Why only on my m50 this lens have  strong back focus ?

 Jpeg with exif

[Tronhard]

Brian, I am with you.  My first reaction was to wonder if native lenses are working with the body, what adapter is in use and despite the lens working with other cameras, that does not guarantee it will work with this configuration.
In that respect, Canon cannot help, as they don't support 3rd-party lenses.
While I differ from you in my technique, which really is fine as there are many ways in which one can work, I will say that one needs to be careful in using a balance of features appropriate for the purpose at hand.

[Waddizzle]

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@Tronhard wrote:

Here are the full details for the RAW Image, as shot:

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I do not see anything that jumps out at me as wrong with the photo.

I do not underhand how one can conclude that the camera?lens combo is back focusing from a “one off” photo.  I see no evidence of back focusing, probably because this is not a test shot.  It looks comparable to the images from my M3, which come nowhere close to being as sharp and detailed as images captured by my full frame bodies.

My advice to the OP is check the firmware in your lens.  Accept the fact that every shot you take will not be a keeper.  If you have doubts with this lens, then capture some formal test shots.  This “one-off” photo proves absolutely nothing.

[NickSlav]

Yep this photo is "one off" but the same situation with 50% or more  photos from this set. (((( so i cant upload all raws 

[NickSlav]

And i have from this set 600 raws and 300 of them with that issue 

[NickSlav]

Adapter is from CANON not third party, native lenses works well 

[jrhoffman75]

A thought.

If your shooting is of images similar to this why not select One Shot AF? Subjects aren't moving and subject faces are clear. No need to rely on camera detection and focus judgement.

[Waddizzle]

What is the basis for your conclusion of back focusing in your sample images?  The image of the face has been cropped down 400x300. Is that your evidence?

[Tronhard]

Thanks for your response Nick: and apologies for missing that in your original post.

If the lens you are using is the 18-35mm F1.8 DC HSM | Art model, which is an 11 year-old unit, then my suspicions are going in the direction that this lens may not be as compatible to the M50 as your other optics.  Again, it does not necessarily mean it is a complete mismatch, but you may not perform 100% as you might want it to. Have you checked with the Sigma folks to see if they have had similar issues reported with this model of camera? 

I checked with the Sigma website and this lens is not listed as being compatible with the M50.
Camera Compatibility | Support | SIGMA Corporation (sigma-global.com) Now, this very short list may simply be an indicator that they just didn't test it - there are a lot of possible permutations here, but it does not mean that one can take it for granted that the lens does work either.

Leaving that aside, you could try some experiments...

Simply set your camera up to the default settings, and try shooting in a similar situation with it in different modes to see if there is some setting that is throwing it off.
Another thing to consider is find another M50 and see if you have the same experience - this to see if it is specific to this camera.