Blade Interference on Canon 90D with a Sigma ART 1.4, 35mm

[dpisarra]

I have a 35mm Art 1.4. On my Canon Rebel T3i I get perfect pictures at 1.4, and on my Canon 90D ( also a crop sensor) I get blade interference at 1.4 - Why? What am I missing here? 

[Waddizzle]

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@dpisarra wrote:

I have a 35mm Art 1.4. On my Canon Rebel T3i I get perfect pictures at 1.4, and on my Canon 90D ( also a crop sensor) I get blade interference at 1.4 - Why? What am I missing here? 

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What exactly is "blade interference"?  I have never heard that term before.  

Can you post sample images that demonstrate the issue?  

[dpisarra]

I think it's a firmware issue. Sigma has replied that they have an update to fix this known issue.

It is vignetting - oddly it shows up in the preview, but not the CR3 or DNG on Lightroom.

Thank you for participating and trying to help. 

[kvbarkley]

The preview is a jpeg that is created by the camera.

[jrhoffman75]

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@dpisarra wrote:

I have a 35mm Art 1.4. On my Canon Rebel T3i I get perfect pictures at 1.4, and on my Canon 90D ( also a crop sensor) I get blade interference at 1.4 - Why? What am I missing here? 

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Do you mean vignetting?