1. Model: 2.5x17.5mm.
2. Material: all metal frame strong and durable good hand feel.
3. Focusing method: rotate focusing.
4. Mirror information: high quality composite all-achromatic optical lenses.
5. Eyepiece diameter: about 8mm.
6. Objective lens diameter: about 17.5mm.
7. Magnification factor: 2.5x.
8. Field of view distance: 8m/600m.
9. Field of view Angle: 6.5 degrees.
10. Pupil diameter: 16mm.
11. Pupil distance: 13.5mm.
12. Coating: blue film.
13. Product size: only 35x22mm.
14. Net weight: 20g.
15. Form: 3 pieces of 2 sets of objective lens are adopted.
16. The imaging is clear and bright due to the use of 3 pieces of 2 sets of objective lenses.
17. Its so small that you can see distant objects by just putting it on your finger!Bigger than your thumb.Anytime anywhere easy dexterity!It could be a small telescope in the world.