Optics Glossary

Coating
Reflection on glass surfaces is enormously reduced and the light transmission is increased thanks to the coating we apply to our lenses (evaporation of metal oxides or fluorides).
ClicLoc Strap Attachment
Binoculars are always firmly attached to the strap with the Steiner ClicLoc strap attachment. Easily release and reattach the strap with a single action. This clever quick-change system let you exchange different straps, such as going from a comfort harness to a floating strap, in a matter of seconds.
Compass Zones
There are five different world zones because different magnetic forces have to be considered. Only at the equator the field lines run horizontally (inclination = 0°), at the poles the inclination reaches nearly 90° – in between all intermediate values can be found. On the northern hemisphere the north pole of the compass rose is “pulled down”, on the southern hemisphere the south pole. More information can be found here 
Dielectric Mirror
In the Wildlife XP 10×44, 8×44, the specially developed dielectric mirror in the roof prism system can reflect up to 99% of the incident light.
Comfort Grip
ComfortGrips are ergonomic and specially shaped soft thumb cushions that have a non-slip surface. They provide a unique handling.
Distance-Control-System
The Distance-Control-System makes sure you get fast and comfortable recognition of animals and birds. Focusing takes place even before the binoculars are even on the eyes.
Edge Sharpness
The sharpness images from the centre to the edge decreases for physical reasons. The better the quality standard of the binoculars, the better the edge sharpness you will get.
Dioptre
Dioptre is a unit of measurement for the refractive power of optical lenses. A lens with the focus at 1 m has the refractive power of 1 dioptre.
Eyecups
The term for the connection piece between the eyepiece and the eye of the observer.
Eye Relief
The distance of the eyepiece from the user’s eye where the full field of view of the product is seen.
Exit Pupil
The exit pupil is located just before the eyepieces and ideally matches the diameter of the eye pupil of the user. Formula for calculating the diameter: Lens diameter : Magnification number. The larger the diameter of the exit pupil, the better the viewing result at dusk, since the human eye pupil widens at low light levels (approximately 7 mm for young people and approximately 5 mm for those of the age of 50). During the day, a diameter of approximately 2 to 4 mm is sufficient. However, the exit pupil says nothing about the quality of binoculars.
Field of View
The overseeable terrain at a distance of 1 km from the object being observed. Usually given in metres. If given in angles, 1°=17.5 m.
Fast-Close-Focus
The technology that is specially designed for close-up focusing (from approximately 2 m), that enables fast and convenient focusing thanks to stepless, damped focusing.
Focal Plane
A plane at right angles to the main axis of a lens or mirror that displays the best (sharpest) image of an object.
Fluoride Glass
To improve the contrast depth and colour fidelity of the image, fluoride-containing glass types, which consist mainly of the mineral calcium fluoride are used in Steiner products.
Glasses Wearer Ocular
Steiner binoculars come with soft eyecups that can be easily folded down. This gives wearers of glasses the ideal distance to the eyepiece.
High-Contrast-Optics
Steiner use a special coating and amplification of individual colour spectra that results in sharply defined and bright image quality – even in dazzling sunlight or early twilight!
Focal Plane Location
A plane at right angles to the main axis of a lens or mirror that displays the best (sharpest) image of an object.
High-Definition-Optics
Steiner has specially developed optical technology for our Expert series, which ensures first-class light transmission thanks to highly complex coating technology.
Luminosity
A calculated measure of the brightness value of a pair of binoculars. The higher the luminous intensity, the better the binoculars are suitable for twilight situations. The formula for calculation is: Divide the lens diameters by the magnification. Square the result. Relative luminous intensity: While the geometric luminous intensity only takes into account the objective diameter and the magnification, the relative luminous intensity describes the additional increase in performance due to special types of coating and, compared to an uncoated glass, is expressed as a percentage increase (e.g. 60%).
Magnification
In the model name of a pair of binoculars, the first number indicates how much closer the observed object can be seen to the user’s eye.
Memory Ocular
Gives convenient memory of the personal focus setting – a significant advantage at dusk or when several people are using the binoculars. Visual comfort on an excellent standard.
Makrolon®
Developed in the aerospace industry, Makrolon® is an oustanding high-tech material that provides resistance to corrosion and temperature.
Minute of Angle (MOA)
The minute of angle is a unit of circle measurement, at 100yards distance it corresponds to 1.0472 inch. In practice, 1 MOA is given as 1 inch on 100 yards, 2 inches on 200 yards, and so on.
Mil
MIL is an angle specification where 1 width unit is specified for 1000 length units, for example 1m distance in 1000m.
Nitrogen Pressure Filling
Via special valves, nitrogen is pumped into the vacuum of the binoculars. This prevents fogging of the lenses or the formation of condensation in temperature ranges from -40°C to +80°C.
Nano-Protection
Nano-Protection is an ultra-thin, hydrophobic surface refinement on ocular and objective lenses protects against all tough environmental influences. It is saltwater-repellent and therefore extremely durable.
NBR Longlife Rubber Armouring
A special rubber armouring that is resistant to oil, acid and salt water. This armouring protects and extends the life of your binoculars.
Objective Diameter
The diameter through which light passes into the binoculars in measured in millimetres. The larger the objective diameter, the more light can enter and the better the binoculars are suitable for low light conditions.
Objective Lens
The objective lens of a telescopic sight is also known as the entrance lens. Measured in millimetres, it corresponds to the value after the x. E g. a 5-25×56 has an objective lens with 56mm diameter. The diameter of the objective lens determines the amount of light that can reach the user’s eye. With a constant magnification, an increase in the objective lens diameter leads to an enlargement of the exit pupil.
Ocular Lens
The objective lens of a telescopic sight is also known as the entrance lens. The diameter is given in millimetres. It corresponds to the value after the x. E.g. a 5-25×56 has an objective lens with 56mm diameter. The diameter of the objective lens determines the amount of light that can reach the eye. With a constant magnification, an increase in the objective lens diameter leads to an enlargement of the exit pupil.
Optical Characteristics
The optical characteristics of a binocular. For example, 8×30 or 7×50. The first number (for example 8 or 7) of binocular markings indicate how much larger an object appears in the binoculars compared to looking at the object without binoculars. Read more under Magnification. The second number of characteristics, for example 30 or 50, indicates the objective diameter in millimetres. For more information see Objective Diameter.
Parallax
The parallax is an error between the reticle and the object. This error usually occurs when the eye travels from a blind spot back to the centre when looking through the scope.
Porro Prisms
The Porro prism system leaves the incident light waves unchanged. This results in a better image quality compared to the roof prism system.
Precision-Setting
The Steiner Wildlife XP 10×44 and 8×44 allows you to focus both eyecups individually. The direct adjustment of the eyecups produces a perfect image for both eyes.
Resolution
This indicates the ability to recognise details and therefore the sharpness of the image being observed.
Rotating Eyecups
Steiner rotating eyecups are self-locking in order to provide the optimum distance to the eyepiece, especially for those who wear glasses. The three levels of the rotating eyecups allow an ergonomic, a classic cylindrical and a glasses wearer position. If the eyecups do not fit exactly, they can be precisely adjusted using the eyecup fine adjustment facility. The ergonomic part of the rotating eyecups provides optimum protection against stray light from the sides. Not only do they eliminate annoying reflections, they also make for an extremely bright image.
Roof Prisms
Roof prisms provide an almost linear incidence of light, although light waves are slightly shifted. Due to the arrangement of the roof prisms however, these binoculars are particularly slim and handy.
Sealing
Steiner binoculars are extremely resistant to moisture, dirt and dust due to specially designed sealing techniques.
Sports-Auto-Focus
Very impressive visual sharpness, without the need for annoying refocusing! The Sports-Auto-Focus system allows the user to only have to adjust the Steiner eyepieces once for his or her visual acuity and enjoy continuous sharpness from approximately 20 metres. The Steiner Sports-Auto-Focus system makes handling particularly comfortable. If both eyes are of the same dioptre strength, simply set both of the adjusting rings on the eyecups to ”0“ and you will see clearly from 20 m to infinity. If not, adjust both oculars individually for razor sharp images. Once adjusted, everything will be sharp and clear from 20 m to infinity for varying distances. Simple use. And cane done using a only a single hand.
Transmission
The amount of residual light incident on the objective lens that exits the ocular after it has passed through the binoculars. The more powerful the coating of the lenses of the binocular, the higher the light transmission and therefore the light that hits the user’s eye.
Twilight Factor
Twilight factor has the most significant impact on resolution or image details. It is a measurement to distinguish efficient viewing in low light conditions. The Twilight Factor is calculated by taking the square root of the magnification of a product and the aperture. The higher the twilight factor the better the resolution For example, when viewing under low light conditions.
Ultra-High-Definition-Optics
Steiner Ultra-HD Optics give the highest level of manufacturing precision and high-quality fluoride glass. This ensures absolutely natural colour reproduction, maximum resolution and optimum contrast.
Steiner Australia
Steiner Australia Logo
x Logo: Shield Security
This Site Is Protected By
Shield Security