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1)Specification: The specification of monocular is represented by the "magnification ×objective diameter".

2)Magnification: The magnification of monocular means the ability to observe closely the object.

3)Clear Aperture: The clear aperture is the optical aperture of monocular, which is the channel of the external light entering the telescope.

4)Field of view:Generally using"... M/1000M or"... Degree “ as representation. In general, Edge imaging of monocular with large field is inferior to the monocular with small field’s, which is basically a contradiction.

5)Exit Pupil: The Exit Pupil is the spot size which is formed by the image through the monocular eyepiece, a simple formula: objective diameter / magnification = Exit Pupil.

6)Eye relief: Exit relief refers to the longest distance of the eyes away from the eyepiece when you see clearly the whole field.

7)Near focus:the near focus is the closest distance between a person and imaged objective which is observed by monocular. That is the monocular' shortest focusing distance.