Kowa Eyepieces - For TSN 770 & 880 Series Scopes

New eyepieces for the new TSN 770 & TSN 880 series scopes, offering the same magnification on both scopes.


 


TSN 30x Wide Angle

New mount design
Lens design: 5 groups with 7 elements. Comfortable to look through with a 10% wider field of view than the TSN-820M Series
Waterproof and nitrogen purged to prevent the lens from fogging
Eyepiece converters allow the use of eyepieces from other spotting scope series
20mm of long eye relief for ease of viewing
Eyepiece locking system
4 clicks twist-up eyecup



 
When Used On The...


TSN 770
TSN 880


Magnification
30x Wide


Real Field of View
2.4°


Apparent Field of View
72°


Exit Pupil Diameter
2.6mm
2.9mm


Relative Brightness
6.8
8.4


Twilight Factor
48.1
51.4


Eye-Relief
32.0mm


Field of View at 1000m/yds
36.7 m/yds







TSN 20x Long Eye Relief

New mount design
Lens design: 4 groups with 7 elements 
Waterproof and nitrogen purged to prevent the lens from fogging
Eyepiece converters allow the use of eyepieces from other spotting scope series
32mm of extra long eye relief for ease of viewing
Eyepiece locking system
Easy to remove rubber eyecap



 
When Used On The...


TSN 770
TSN 880


Magnification
25x LER


Real Field of View
2.1°


Apparent Field of View
52.5°


Exit Pupil Diameter
3.1mm
3.5mm


Relative Brightness
9.6mm
12.3mm


Twilight Factor
43.9
46.9


Eye-Relief
32.0mm


Field of View at 1000m/yds
36.7 m/yds







TSN 20-60x Zoom

New mount design
Improved field of view at lower magnification 
Aspheric lens design for a very flat field throughout the zoom range
3 clicks twist-up eyecup
Waterproof and nitrogen purged to prevent the lens from fogging
Eyepiece converters allow the use of eyepieces from other spotting scope series
Long eye relief for ease of viewing
Eyepiece locking system
Lens design:  6 groups with 9 elements



 
When Used On The...


TSN 770
TSN 880


Magnification
20x-60x, Zoom


Real Field of View
2.2° - 1.05°


Apparent Field of View
44° - 63°


Exit Pupil Diameter
3.9 - 1.3mm
4.4 - 1.5mm


Relative Brightness
15.2 - 1.7
19.4 - 2.3


Twilight Factor
39.2 - 68.0
42.0 - 72.7


Eye-Relief
17 - 16.5mm


Field of View at 1000m/yds
38.4 - 18.3 m/yds