Problem with black spots on my c300

[bcrete]

Hello,

I have a Canon C300 and noticed that there are some spots on the image of my videos. At first I thought the lens was a bit dirty. But I cleaned it, and also used other lenses and they all have the same problem. Can someone tell me what this may be and how I could fix it?

It's not always noticeable, certain light combinations hide it or make it extremely obvious.

Here is an image to show what I mean

[Waddizzle]

The top photo looks like a dirty image sensor.  Look into using a "DSLR rocket blower" to blow dust out of the compartment.  

As a general rule, you never want to touch the image sensor.  Never use canned air to blow out the camera, either, because those tend to leave residue behind.  There are YouTube videos that show you how to use.bulb blower to clean a DSLR.