Can someone tell me what causes this.

shaylou

shaylou

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Shayne
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I'm asking for someone else, I have never seen this. They are using a 5DIII and a Sigma 85 1.4. It doesn't show up in photoshop only in live view.

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If magic lantern is installed it could be an overlay.
 
Are you referring to the circle? Is the 5D a FF camera and the lens designed for APS-C sized sensors? I'd say that's the area of coverage indicated for the lens.
 
Does it happen with other lenses or just that one?
 
Seems a little like this unresolved issue on the 6D (link), it does look very deliberate though, almost like a broken level gauge.
 
Well, thats damn strange - I've been googling since you posted and have found nothing - sorry, may be worth trying the lens on another body, not that it would help at all but its worth knowing if its just that body\lens combination.

Have they tried removing the battery and resetting it that way - should make no difference but you never know.
 
JohnN said:
Well, thats damn strange - I've been googling since you posted and have found nothing - sorry, may be worth trying the lens on another body, not that it would help at all but its worth knowing if its just that body\lens combination.

Have they tried removing the battery and resetting it that way - should make no difference but you never know.
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It is strange for sure. I ask her to test another lens again because she didn't really convince me that she had done that. The really puzzling thing is that it doesn't show up in photoshop. I guess we will wait and see if anyone has come across this. Thanks for your help, I have been looking for an answer without any luck so I need all the help I can get to figure this out.
 
Is the image taken from an image about to be captured or one that was taken and the ring shows only after taken so strange looks like a small filter is wedged in the lens

I seem to recall you can in the 5D3 menu set lens profiles for non Canon EF lens has that been set if so could you try reset for factory default may account why other lenses are ok
 
I thought about a filter too, but that would show on the final image, thats why initially I considered a magic lantern overlay as I recall it has cropmark overlays, anamorphic borders and a Fibonacci circle (link these - link)
 
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ancient_mariner said:
Are you referring to the circle? Is the 5D a FF camera and the lens designed for APS-C sized sensors? I'd say that's the area of coverage indicated for the lens.
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No FF canon is designed to take an APS-C lens so doubtful!
 
border_all said:
Is the image taken from an image about to be captured or one that was taken and the ring shows only after taken so strange looks like a small filter is wedged in the lens

I seem to recall you can in the 5D3 menu set lens profiles for non Canon EF lens has that been set if so could you try reset for factory default may account why other lenses are ok
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She had mentioned that she reset the lens correction. I have 2 5DIII's and had never heard of it in camera so I ask her if she was talking about the lens correcting in post software. I thought I knew my camera pretty well but I could have missed that I guess. She hasn't answered that question. I suggested that she reset her camera but not sure if she has done that either.
Sorry for all the "she said" stuff. I'm just trying to help someone and I know how knowable this forum is so I thought I would bring it here. Thanks for your help everyone.
 
The Sigma 85mm 1.4 is definitely a full frame lens
 
I'm wondering if the focusing screen has come loose?
 
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If it's not visible through the viewfinder or in image post processing, but only in the camera live view, then it must be being generated by image processing software in the camera.
 
chris malcolm said:
If it's not visible through the viewfinder or in image post processing, but only in the camera live view, then it must be being generated by image processing software in the camera.
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I agree and assuming she shoots raw the live view is a jpeg view that points internal software for me as well hence not visible in process or view finder. that was why i enquired if the screen shot was from an image about to be taken or was a view of an image stored if its actually what is shown does it appear when you view after the shot is taken. Also as its only one lens it makes me think its a software lens profile that has been changed in the camera.

Hope a solution is found its most puzzling :(
 
border_all said:
I agree and assuming she shoots raw the live view is a jpeg view that points internal software for me as well hence not visible in process or view finder. that was why i enquired if the screen shot was from an image about to be taken or was a view of an image stored if its actually what is shown does it appear when you view after the shot is taken. Also as its only one lens it makes me think its a software lens profile that has been changed in the camera.

Hope a solution is found its most puzzling :(
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Live view isn't a JPEG it's a live feed from the sensor (hense the name!). I took this as its visible even when not taking the shot.

If you mean the shot review, that's unprocessed as well (other than creating a visual review) in raw format so it shouldn't be that.
 
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odd jim said:
Live view isn't a JPEG it's a live feed from the sensor (hense the name!). I took this as its visible even when not taking the shot.

If you mean the shot review, that's unprocessed as well (other than creating a visual review) in raw format so it shouldn't be that.
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Thanks guess it's live and learn I always thought the image after shot review was the imbedded JPEG so for example if you had blinkies activated you got an idea of exposure then in processing in raw you had more headroom thanks good knowing
 
odd jim said:
Live view isn't a JPEG it's a live feed from the sensor (hense the name!). I took this as its visible even when not taking the shot.

If you mean the shot review, that's unprocessed as well (other than creating a visual review) in raw format so it shouldn't be that.
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This is a shot preview after the fact so it's not a live view. I thought the preview was a compressed jpeg?
 
shaylou said:
This is a shot preview after the fact so it's not a live view. I thought the preview was a compressed jpeg?
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It is, Jim's mistaken. Everything you see on the LCD is a JPEG, with all in-camera settings applied.

But no idea what's causing this problem. If it's just with that one lens though, I'd go with a hunch that it's maybe related to a Sigma firmware issue, but never seen anything like it before.
 
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I think we might have it narrowed down to a lens software issue because it only happens to this one lens and it doesn't show up in Photoshop. She also mentioned something about using a lens correction setting but I am not aware of an in camera setting for that.
 
shaylou said:
I think we might have it narrowed down to a lens software issue because it only happens to this one lens and it doesn't show up in Photoshop. She also mentioned something about using a lens correction setting but I am not aware of an in camera setting for that.
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Could be something in the lens correction comment - vignetting, or Peripheral Illumination as Canon calls it, but it's gone wrong somehow. I'd say that was quite a good call.
 
HoppyUK said:
Could be something in the lens correction comment - vignetting, or Peripheral Illumination as Canon calls it, but it's gone wrong somehow. I'd say that was quite a good call.
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But I thought she said that the correction was in a camera setting not in Lightroom or photoshop. I didn't think there was such a setting, do you know if the 5DIII has a lens correction setting built in?
 
shaylou said:
But I thought she said that the correction was in a camera setting not in Lightroom or photoshop. I didn't think there was such a setting, do you know if the 5DIII has a lens correction setting built in?
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Yes, I think all Canons have it. I'll bet it has something to do with that.
 
shaylou said:
Found it! I even have it on. I had no idea.... I'm not sure if it is doing anything.
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Shoot a plain wall at lowest f/number, on and off, and you'll see it working.
 
I would still ask her to do a camera reset better still buy a new button battery that keeps the camera settings even going back with Canon 40D they have on occasion got some mix ups that only a reset would cure. Also if a lens has firmware I would suggest checking the mating surface is clean and not damaged

You may know if you want the battery replaced and a reset it's best if the battery is left out for a while, can't remember where the battery is on 5D3 think it slits in near the main battery
 
If I recall correctly peripheral illumination only works with Canon lenses and the way the camera recognises the lens is through a number code. If the Sigma lens has a number code which matches a Canon lens the body will assume its a Canon lens attached and apply the peripheral illumination correction if its active. So it may be this that is the issue.

Alternatively I could be really wide of the mark with both possible cause and technical information so happy to stand corrected. :)
 
HoppyUK said:
It is, Jim's mistaken. Everything you see on the LCD is a JPEG, with all in-camera settings applied.

But no idea what's causing this problem. If it's just with that one lens though, I'd go with a hunch that it's maybe related to a Sigma firmware issue, but never seen anything like it before.
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I stand corrected :) I still didn't think any camera settings away from the raw profile were applied to the thumbnail though?
 
HoppyUK said:
Yes, I think all Canons have it. I'll bet it has something to do with that.
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I've used the in camera corrections sporadically (mainly experimenting) but not seen this before.
 
shaylou said:
Doing it now
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You need a reasonably evenly illuminated plain wall. Vignetting correction will only show up if the lens has some to correct, but all lenses have at least something noticeable at max aperture though it's much less prominent on APS-C. Wide zooms tend to have a lot, fast primes too, but it disappears rapidly on stopping down a bit.

It turns out this is a known problem, if you google 'canon peripheral illumination sigma lens'. One poster on DPreview describes it exactly like Shayne's example. Reading between the lines, it seems like it's related to Sigma trying to fox the camera into making a non-Canon lens work with a dummy code. As seems to happen quite often, this usually works okay when Sigma first introduces it, then Canon changes the game with later cameras and a lens firmware update is required.

Maybe contact Sigma about that, but it's not a big deal. Lightroom etc will correct it no problem. If you simply switch off Peripheral Illumination correction with this lens, I suspect the camera will be fine.
 
odd jim said:
I stand corrected :) I still didn't think any camera settings away from the raw profile were applied to the thumbnail though?
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You can't actually see Raw data Jim. It has to be processed into a viewable image file, ie a JPEG, and that also shows all in-camera adjustments applied. White balance, contrast, sharpening, noise reduction, etc etc.
 
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