Hey Max,
Be sure to create a post processing volume for you scene and either adjust the bounds of the box to sit around your scene or just click the unbound option within the post process detail panel. Within the post processing volume set the motion blur Amount and Max both to 0.0. This should fix the visual blur you are seeing. What is happening is that because your Scene Capture 2D is being blended with your post processing volume in your scene it must be fixed within an external value. Let me know if this helped solve your issue!
Thanks,