01
When one barrel beats two
A monocular is a single barrel of a binocular. It is half the weight and size, quick to raise with one hand and easy to carry every day. The cost is comfort: two eyes relax more than one over long sessions, so a monocular suits quick looks rather than long watches.
The same numbers apply. 8×25 and 10×25 are the practical sizes, and everything in our binocular guides about magnification, exit pupil and glass applies equally here.
Magnification
8×
Objects appear this many times closer
Objective lens
42mm
Full size, around 650 to 750g
Exit pupil
5.3mm
42 ÷ 8. Bigger is brighter
Twilight factor
18
Higher resolves more detail in dim light
Bright, easy to hold and comfortable at dawn and dusk. A true all rounder.
