SEP 20-60 is a zoom eyepiece designed for Nikon's PROSTAFF 5 observing telescopes. It allows you to obtain 16-48x magnifications for the Prostaff 60 and 20-60x telescopes in the Prostaff 80 lunettes.
• bayonet mount with lock for easy assembly and disassembly
• Lenses coated with multilayer anti-reflective coatings
• water resistance
• large offset of the exit pupil
• new eyecups extendable rotationally
• eyepiece with zoom
• two caps
• rubber eyecup
• cover / case | SEP-25 | SEP-38W | SEP-20-60 | | PROSTAFF 5 60/60-A | PROSTAFF 5 82/82-A | PROSTAFF 5 60/60-A | PROSTAFF 5 82/82-A | PROSTAFF 5 60/60-A | PROSTAFF 5 82/82-A | Magnification (x)
| 20 | 25 | thirty | 38 | 16-48 | 20-60 | Field of view)
| 2.8 | 2.2 | 2.3 | 1.8 | 2.6 (@ 16x) | 2.1 (@ 20x) | Apparent field of view (°)
| 51.3 | 62.1 | 39.9 (@ 16x) | 39.9 (@ 20x) | Field of view
at 1000 m (m)
| 48 | 38 | 40 | 31 | 45 (@ 16x) | 36 (@ 20x) | Outlet gap (mm)
| 3.0 | 3.3 | 2.0 | 2.2 | 3.8 (@ 16x) | 4.1 (@ 20x) | brightness
relative
| 9.0 | 10.9 | 4.0 | 4.8 | 14.4 (@ 16x) | 16.8 (@ 20x) | Eye relief (mm)
| 17.6 | 19.0 | 16.9 (@ 16x) | 16.9 (@ 20x) | Weight (g)
| 135 | 185 | 225 |
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