topic Re: EOS M50 out of focus in EOS DSLR & Mirrorless Cameras

EOS M50 out of focus

NickSlav — Thu, 16 May 2024 18:11:20 GMT

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

Re: EOS M50 out of focus

p4pictures — Thu, 16 May 2024 18:32:16 GMT

What AF settings are you using on the camera, and are you recomposing?

I downloaded your larger image and it has been edited, so I cannot read the detailed camera settings using Canon DPP software. Here's an example of the detailed settings I can see for an EOS M50 Mk2 JPG image straight from the camera.

This is what I see from your image.

If you can give us a screenshot like this from your image then it makes it easier to help you.

Re: EOS M50 out of focus

NickSlav — Thu, 16 May 2024 18:58:44 GMT

So io can give screen shot but ur dont understand bacause it on my native language and i dont know how to make it english. but a can tell the what is the af settings (AF.mode one shot, Face detecting + Tracking AF, continuous AF - enabled)

Re: EOS M50 out of focus

NickSlav — Thu, 16 May 2024 19:10:27 GMT

can i upload raw image somwhere because i shoot only raw and no have jpg from camera ?

Re: EOS M50 out of focus

p4pictures — Thu, 16 May 2024 19:21:28 GMT

You could upload to Google drive, MS one drive, Dropbox and share a link to the file.

Re: EOS M50 out of focus

NickSlav — Thu, 16 May 2024 19:26:23 GMT

https://dropmefiles.com/j5uC1

Re: EOS M50 out of focus

zakslm — Thu, 16 May 2024 23:59:41 GMT

Brian,

Before offering my "non-expert opinion, I'd like to get your opinion on what I think may be the issue and a possible solution for the orginal poster.

I'm guessing that the face of the model is not in sharp focus (but the background is) because teh AF area select mode is "Face detection + Tracking AF" per the EXIF data.

Again, my guess is the the "Tracking AF" was hunting and focused on the background instead of the face and eyes.

My camera doesn't have face detection, but in order to get the model's face in focus, I would have chosen the Center focus point (I have a T7 with 9 focus points) One Shot AF, focused on the models left eye and upon hearing the beep, taken the shot.

What do you think?

Re: EOS M50 out of focus

Tronhard — Fri, 17 May 2024 03:31:25 GMT

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

Re: EOS M50 out of focus

p4pictures — Fri, 17 May 2024 07:38:24 GMT

Thanks for the RAW file NickSlav, and to zakslm and Trevor for the decoded info.

I don't see anything in the EXIF that would point to a camera settings error. I have two thoughts;

Maybe the camera and lens don't work together well. Even though the lens works well on other bodies, maybe there is some body specific issue with this combination.
With the camera set for one-shot AF and the AF area set to Face detection + Tracking AF it is possible that the model or camera moved after the AF locked, but usually I'd expect to see much less of a focus difference.
Turn off preview AF, it might be called continuous AF in the camera menu.

I'd advise the following steps. First check the camera with other lenses - particularly Canon lenses if possible. Does it work consistently and achieve focus. If so this could indicate the lens is the problem in this combination of camera and lens. Secondly I would try to use servo AF not one shot. With the camera set for face detection + tracking AF, servo AF will keep focussing right up until the shutter releases, and will also move the AF point to keep it on the face even if you recompose the frame. I've found that this gives me consistently focused results with mirrorless cameras.

Re: EOS M50 out of focus

p4pictures — Fri, 17 May 2024 07:48:11 GMT

Face detection + tracking AF is the name used for the whole frame being the AF area. It's a little like using your T7 with all AF points, but the M50 has AF points all over the frame and has intelligence to identify and prioritise faces. The EOS M50 also has 1-point AF like your Rebel T7, but where you can put the AF point at one of 9 places, the EOS M50 can put it in up to 143 different positions depending on the lens used.

One of the biggest changes in my own way of working when I went from DSLR to mirrorless was to switch away from the old way of "put the AF point on the subject, focus, then recompose". I now let the camera put the focus point on the subject, trusting it to get it right almost all the time, and me to compose as my priority. This has lead me to compose my shots better as I can devote my brain to composition and let the camera deal with AF.

Re: EOS M50 out of focus

Tronhard — Fri, 17 May 2024 08:09:21 GMT

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.

Re: EOS M50 out of focus

Waddizzle — Fri, 17 May 2024 09:47:17 GMT

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

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.

Re: EOS M50 out of focus

NickSlav — Fri, 17 May 2024 11:38:07 GMT

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

Re: EOS M50 out of focus

NickSlav — Fri, 17 May 2024 11:40:29 GMT

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

Re: EOS M50 out of focus

NickSlav — Fri, 17 May 2024 11:43:18 GMT

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

Re: EOS M50 out of focus

jrhoffman75 — Fri, 17 May 2024 13:12:50 GMT

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.

Re: EOS M50 out of focus

Waddizzle — Fri, 17 May 2024 13:17:58 GMT

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?

Re: EOS M50 out of focus

Tronhard — Fri, 17 May 2024 18:27:53 GMT

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.