Canon 5D Mark IV and 24-70mm L and when shooting vertically, camera bottom side is dark

[lifer311]

So i'm shooting product photos for an auction and I shoot vertically a lot. Usually I turn the camera clockwise, with the camera bottom being on my left. When I take the picture, the left edge of the photo seemed shadowed or slightly darker. I thought it was a lighting problem, but I've noticed that if I turn the camera counter clockwise, the right side is dark, not the left. Never experience this before. Suggestions?

[kvbarkley]

Are you using flash? Is it on camera?

[lifer311]

Softboxes. Here are two undedited examples. I'm simply turning the camera opposite ways. I cropped it slightly, but they were both shot vertically . First photo has the bottom of my camera facing the right. Brand new camera, used lens. 

[RobertTheFat]

Are you using flash? What you describe sounds like you may have had the flash unit angled for bounce flash and forgot to readjust it when you rotated the camera.

[lifer311]

Two softboxes, equally spaced, pointing towards the wall on a slight angle inward. If I shoot horizontally, both the left and right sides are equally lit. 

[RobertTheFat]

Is that the old 24-70 or the Mark II? I've read that the old one had a huge and rather wacky lens hood. Could it be casting a shadow? Something must be.

[lifer311]

It is the old one, but I'm not using a lense hood. I'm stumped. It doesn't make sense to me. 

[Waddizzle]

The only obvoius variable that's changing is gravity.  It's almost as if the image circle shifts.

[Waddizzle]

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@lifer311 wrote:

It is the old one, but I'm not using a lense hood. I'm stumped. It doesn't make sense to me. 

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You don't have auto-rotate enabled?  Should the one image be upside down?

[RobertTheFat]

It looks as though something on the top or bottom of the camera is interfering with the light from one of the softboxes. (Which one depends on which way the camera is oriented.) A tripod mount, perhaps?