Small shadow's in corners of footage????

[thirdd3]

I am finding very small shadows in both the left top and bottom of my footage. I can see them moving ever so slightly when I'm shooting handheld. Its just a very small cropping thing going on. They have a curve to them so it makes me think that it is inside my lens somewhere where something got misaligned. I dont see it in the viewfinder but once I look at the downloaded footage I can see it.

Anyone else had this issue??

 

[Dave ©]

What do you have in front of your glass? Filters? NDs? Polarizer?

Without more information or a pic, I'd guess it's vignetting.

 

[Barry_Green]

Yep, sounds like you're probably at wide angle and seeing the edges of a filter or something. And the edges would move slightly if you had the OIS on.