Zion PowerView 20X280X70 SUPER Zoom Military Hunting Binoculars HeavyDuty Alloy

Zion PowerView 20X -280X 70 Zoom Military Binoculars Bigger Eye Lens Longer Eye Relief. It has bigger eye lens and longer eye relief then regular 15mm eye lens binoculars. How to use these Zoom Binoculars, and see shape clear image?