Tele Vue 20mm Plossl vs Tele Vue 21mm Ethos: specs compared
Updated 05 September 2026.
5
specs differ
Tele Vue 20mm Plossl and Tele Vue 21mm Ethos differ on 5 specs: focal length, apparent field of view, barrel size, optical design, eye relief.
| Spec | Tele Vue 20mm Plossl | Tele Vue 21mm Ethos |
|---|---|---|
| Focal length | 20 mm | 21 mm |
| Apparent field of view | 50 degrees | 100 degrees |
| Barrel size | 1.25 in | 2 in |
| Optical design | 4-element Plossl | Ethos |
| Eye relief | 15 mm |
Questions and answers
How do Tele Vue 20mm Plossl and Tele Vue 21mm Ethos compare?
Tele Vue 20mm Plossl and Tele Vue 21mm Ethos differ on 5 specs: focal length, apparent field of view, barrel size, optical design, eye relief.