Not at all Phil, the Ward uses a prism system to reduce the length of the unit allowing the camera to focus at a shorter distance. What this means is your head is in exactly the same position as when you look through the scope normally, unlike other add ons which add more length i.e archers, envis, other digital add ons, etc
Also what you can do is still use your scopes reticule system, millet, ladder, etc
What I do with my FAC airgun is leave it on 10x mag so I know the reticule ranges for varying distances, then I use one of custom rifle scope rangefinders, these are excellent for airg