The Leica Amplus 6 uses an optical system offering published light transmission of more than 90%. This characteristic works together with lens treatments, strong contrast and management of unwanted internal reflections.

The result is natural colour reproduction and good visibility of subtle details. Optical quality becomes particularly valuable as available daylight decreases and the performance of the optical elements matters increasingly.

A quality image depends on more than objective diameter alone. Light transmission, contrast, colour correction and resistance to stray light are equally important.

At 2.5× magnification, the Leica Amplus 6 provides a field of view of approximately 15 metres at 100 metres, useful for observing a broader area and maintaining spatial awareness.

At 15× magnification, the field of view is approximately 2.8 metres at 100 metres. Higher magnification allows more detailed observation of distant features under suitable conditions.

Intermediate settings allow the user to balance image detail, field of view and available light.

With a second focal plane riflescope, the reticle's apparent size remains constant as magnification changes.

The crosshair therefore does not become excessively small at 2.5× or appear to expand over the image at 15×.

Importantly, the reticle's angular dimensions relative to the target change with magnification. Published subtension measurements must be interpreted at the appropriate reference magnification.

For conventional hunting use, the clean L-4a pattern offers a practical balance between image visibility and a clearly defined central reference.

The Leica Amplus 6 features a central illuminated red dot with ten brightness levels, allowing the intensity to be matched to ambient lighting.

In lower light, reduced brightness helps preserve a natural view through the scope, while higher settings make the central reference more prominent.

Illumination is controlled by a dedicated adjustment ring and powered by one CR2032 lithium battery.

Switching the illumination off when not required helps conserve battery power.

Parallax is the apparent shift of the reticle relative to the observed subject as eye position changes when the optical adjustment does not correspond to the viewing distance.

The Leica Amplus 6 2.5–15×50i offers parallax adjustment from approximately 20 metres to infinity.

Correct adjustment supports clearer observation and reduces parallax error, particularly at higher magnification settings.

This is a significant practical advantage over riflescopes with factory-fixed parallax.

Leica AquaDura® coating helps repel water droplets and contamination from the optical surfaces.

This technology makes lens maintenance easier and is particularly practical in wet weather, mist and changing atmospheric conditions.

AquaDura® complements the high-quality optical system and robust body construction.

For cleaning, use a suitable soft brush, optical cloth and products intended for coated lenses.

The standard capped adjustment turrets on the Leica Amplus 6 L-4a 50300 have a click value of 0.1 MRAD / 0.1 MIL, equivalent to approximately 1 cm at 100 metres.

The published total adjustment range is 150 × 150 cm at 100 m for the vertical and horizontal axes.

The adjustments are housed in low-profile turrets protected by screw-on caps, helping guard against accidental changes.

After fitting and adjustment to a particular firearm, the turret reference markings may be aligned in accordance with the official Leica instructions.