With auto lenses like the ones you're using, the aperture is open most of the time, it only closes when the photo is actually being taken. I've encountered this issue before it's almost certainly your lenses. And again, correct me if I made any mistakes or anything I don’t know if the vintage Nikkor lenses will solve this issue, but I’d like to stick (at least for now) with my 2 EF/EF-S lenses if I can without the annoying light or possible aperture flickering issue. So, still if anyone can help me solve this issue that would be great. Again, just confirming I have everything right here too ) (This final image is the camera with the scene in the background with the usual manual camera settings.

I wanted to confirm that I have the settings correctly. This is unsure of though, just an assumption) It looks like they both “adjust the aperture when they are manually zooming in and out” (maybe even when they are stable too, which would explain the flickering issue even more ). The one to the right is a newer Canon EF-S 18-55mm Lens (made in 2011), and it came with my camera. (The one to the left is an older Canon EF 35-80mm Lens (this lens was made in like 1993). I have included images below and I'll briefly try to sum what each one is basically: Almost like “aperture flickering”, I guess. It could have something to do with the aperture. Correct me if I made any mistakes (I make a lot of them fyi ) If any could also help me eliminate the grain when I'm capturing my videos, that would also be helpful.

Let me know if any other information you need. I included this video below to show what's going on (it's not the best, but oh well). If you do, that would really helpful (I've only owned this DSLR for a month now btw ). Was wondering if any knew the problem and the reason why this is happening, and how I can fix it. Not sure what's the issue with the flickering though. I am in manual mode, and I pretty sure I have everything set accordingly. And (2, this was happening even when I wasn't even MOVING the scene (it's just me pressing down the capturing key. It's strange since (1, this is NOT a Nikon DSLR (obviously), and Nikon sadly has been known to have flickering happen. Not sure if it's light-related, but I think it's something close. I found this 'flickering' issue with my Canon DSLR (a EOS Rebel T6).

Canon eos rebel t6 dragonframe