Canon 70D + Sigma 30mm f/1.4 DC HSM | A, indoor photo issue

Started Feb 11, 2015 | Questions
Woodbird New Member • Posts: 7
Canon 70D + Sigma 30mm f/1.4 DC HSM | A, indoor photo issue

I have just bought a Canon 70D and also a Sigma 30mm f/1.4 DC HSM Art. They feel great but I have just one problem when shooting in door. I am so new to photography that I don't even know how to describe it. However, I attached a photo below.

Looking closely, one can see that the center area is noticeable darker and there seems to be ring of light in the photo. This is shot with f/1.4, Aperture priority mode. Everything else are kept in default (auto WB etc). I tried with or without the hood. It is shoot at night with indoor lighting.

Is this an issue with the lens, or camera, or is it supposed to be so due to the setting? When shooting at f/2.0 or smaller, it goes away. Below is another one which may highlight the issue better.

Many thanks in advance.

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Canon EOS 70D Sigma 30mm F1.4 DC HSM Art
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Kvenna Contributing Member • Posts: 661
Re: Canon 70D + Sigma 30mm f/1.4 DC HSM | A, indoor photo issue
1

I don't remember seeing anything like this before.  Do you have a filter on the lens?

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Chris

beagle1 Forum Pro • Posts: 10,030
Re: Canon 70D + Sigma 30mm f/1.4 DC HSM | A, indoor photo issue
1

Woodbird wrote:

I have just bought a Canon 70D and also a Sigma 30mm f/1.4 DC HSM Art. They feel great but I have just one problem when shooting in door. I am so new to photography that I don't even know how to describe it. However, I attached a photo below.

Looking closely, one can see that the center area is noticeable darker and there seems to be ring of light in the photo. This is shot with f/1.4, Aperture priority mode. Everything else are kept in default (auto WB etc). I tried with or without the hood. It is shoot at night with indoor lighting.

Is this an issue with the lens, or camera, or is it supposed to be so due to the setting? When shooting at f/2.0 or smaller, it goes away. Below is another one which may highlight the issue better.

Many thanks in advance.

increase your shutter speed

many indoor lights pulse at 1/60 or different frequencies and these can cause problems. also 1/40 is too slow for hand held without IS image stabilization

Sigma 30mm 1.4  non-art  indoors

Canon 60d

Skipper494 Forum Pro • Posts: 11,264
Re: Canon 70D + Sigma 30mm f/1.4 DC HSM | A, indoor photo issue

I'd say that this is the effect of the room lighting and subsequent reflections in the lens.

Zapirian
Zapirian Senior Member • Posts: 1,242
Re: Canon 70D + Sigma 30mm f/1.4 DC HSM | A, indoor photo issue

Check for lens shading adjustment/compensation in any lens adjustment or correction menu in the camera. I saw something identical to this recently in the Sony E-mount forum. It was basically the camera incorrectly applying correction for the lens resulting in the same donut type effect on the output image. Try turning lens compensation/correction settings off totally and see if it removes the donut. Sorry, don't know the exact terms/menus for Canon cameras. Hope this helps

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Guidenet
Guidenet Forum Pro • Posts: 15,748
Re: Canon 70D + Sigma 30mm f/1.4 DC HSM | A, indoor photo issue
1

As others have said, it could be vignette control being applied when not needed. Turn it off, whatever it's called in the menus.

It also could be caused by a poor quality filter of some sort. If someone sold you a UV or other similar protective filter, take it off and toss it away. See if that helps.

Good luck and take care.

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Cheers, Craig
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OP Woodbird New Member • Posts: 7
Re: Canon 70D + Sigma 30mm f/1.4 DC HSM | A, indoor photo issue
2

Thanks for the reply. As the last two posts said, it was indeed because the camera incorrectly applied lens correction.

Guidenet
Guidenet Forum Pro • Posts: 15,748
Re: Canon 70D + Sigma 30mm f/1.4 DC HSM | A, indoor photo issue
1

Woodbird wrote:

Thanks for the reply. As the last two posts said, it was indeed because the camera incorrectly applied lens correction.

Thank you for letting us know you were successful and what worked. When you do this, it helps others in the future by identifying what worked and might also work for them.

Have a great week. 

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Cheers, Craig
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beagle1 Forum Pro • Posts: 10,030
Re: Canon 70D + Sigma 30mm f/1.4 DC HSM | A, indoor photo issue

Woodbird wrote:

Thanks for the reply. As the last two posts said, it was indeed because the camera incorrectly applied lens correction.

good that nothing's wrong with the lens

Pyrate Dave New Member • Posts: 5
Re: Canon 70D + Sigma 30mm f/1.4 DC HSM | A, indoor photo issue

Guidenet wrote:

Woodbird wrote:

Thanks for the reply. As the last two posts said, it was indeed because the camera incorrectly applied lens correction.

Thank you for letting us know you were successful and what worked. When you do this, it helps others in the future by identifying what worked and might also work for them.

Have a great week.

As a new member and beginner, I find it incredibly helpful when the OP posts their solution/cause of issue.

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