Trying to recreate Sniper Scope Parallax effect

Development Rendering
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1

I already have a working aim down sight system in place and want to make my sniper scopes more realistic. I’m trying to create the parallax effect of the scope when looking down it. Something similar to this: Realistic Scope Effect - Development Demo 1 - YouTube

There seems to be no tutorial on this effect on youtube and I would like to know how to do this?

2

I’m talking about the black shadow that moves according to the camera’s position.

3

I figured it out

4

Can you tell us then?