Diagonal Lines

[Andrew Goldman]

I am getting diagonal lines on a substantial number of images shot with the A9 (1st ver) and the Sony 100-400 f4.5/5.6 at maximum frame rate (see example below).  Someone told me these are aliasing artifacts caused by the lack of an anti-alias filter but that this should be rare (which it isn't with me).  Any thoughts or suggestions?

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[Olaf W.]

Are you using the electronic shutter? This could lead to artifacts with moving objects.

[Andrew Goldman]

Yes, I am.  I did not know this could lead to artifacts. I will give the mechanical shutter a go.  Thank you!

[Andrew Goldman]

Turns out that switching to mechanical shutter did not resolve the issue, and cut my frame rate in half (down to 10 fps).  Any other ideas?

[Pieter]

Off topic but if your A9 shoots at 10 fps with the mechanical shutter, it's a version II. Version I only does 5 fps with the mechanical shutter.

On topic: I've seen a question like this before but can't recall exactly where... If I remember correctly it had something to do with a UV-filter on the lens. If you have that, try removing it.