F8-20mm 2.5X Zoom lanthanum Eyepiece. 

Feature:
- Lanthanum lenses bring you incredible observing.  
  The image is extra low aberration, superb bright, flat (almost no distortion), crystal clear and sharp.

- Dedicated universal cell phone phone adapter is optional
  E0820Z-AU (2.5X zoom eyepiece) + P214P-C (universal cell phone adapter) + any brand smart phone = eyepiece
 

Optical Specification
Eyepiece Focal Length	8-20mm
Eyepiece Optics design	7 elements in 5 groups
Eye Relief	20mm
Eyepiece Field of View	40-60 degree
Lens Coating	Fully multi-coated
Mechanism Specification
Main Body materials	Alum. Alloy body
Barrel Size	1.25"
Eye Cup Type	Twist -up eye cup, 4 sections