Realistic Sniper Zoom

So i’m a game developer student. And i’m working on a Vr game which involves snipers. Now i’m working on a sniper scope shader and for that shader i use a renderTexture of a camera which is on the scope. Now my question is how i can make a zoom that starts from 3x to 12x but i want it to be as realistic as possible.

Greetings!

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