When you need to find targets far downrange and move between them quickly, field of view and control layout matter as much as magnification. The K540i is built for professional long-range shooting, pairing 5-40x zoom and a 56 mm objective with Kahles' VISIONFLEX optical design for a wide view and a generous eyebox.

Field of view runs from 10.2 m down to 1.3 m at 100 m, with 92 mm of eye relief and an exit pupil of 7.7 to 1.4 mm. The illuminated reticle sits in the first focal plane, so it stays proportional to the target whichever magnification you choose.

The controls are laid out so you can work them without breaking position. Parallax sits on top, below the elevation turret, and focuses from 20 m to infinity. This version puts windage on the right, the side Kahles specifies for left-handed shooters, and both exposed turrets turn counter-clockwise with EASYREAD markings. A mechanical revolution indicator shows which turn you are on, INDEXSTOP gives a repeatable return to zero, and the TWISTGUARD windage cap prevents unintended adjustments.

The trade-off is bulk: at 409 mm and 1115 g on a 36 mm tube, this scope belongs on a dedicated precision rig rather than a light carry rifle. It is waterproof, powers its illumination from a CR2032 cell and carries a 10-year warranty.

Features

• Wide 10.2 m/100 m field of view speeds target transitions
• First focal plane reticle stays proportional to the target at any magnification
• Top-mounted parallax lets one hand reach every control
• 5-40x zoom with consistent optical performance throughout
• INDEXSTOP and revolution indicator give a quick, repeatable return to zero
• TWISTGUARD cap blocks unintended windage changes without a lock
• Right-side windage suits left-handed shooters
• Illuminated, fine reticle keeps the aiming point clearly visible