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.

Charateristic features

• 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

Elements of the set

• eyepiece with zoom
• two caps
• rubber eyecup
• cover / case

List of technical parameters of Nikon SEP eyepieces for the Prostaff 5 telescope

	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