Sellstrom DP4 Instructions De Montage, D'utilisation Et D'entretien page 7

Optical Class
Spherical Power
Optical
(D, m-1)
Class
(D1+D2)/2
1 ±0.06
2 ±0.12
+0.06
3*
–0.25
NOTE: D1 and D2 are the optical powers on the principal meridians.
*The axes of the principal meridians of both oculars shall be parallel to each other or forming a maximum ±10°.
WARNING: Oculars in optical Class 3 are not intended for long term use!
Data regarding ocular of model DP 4 CV (Clear Visor)
for his appropriate use
Recommendations for users of UV filters (EN 170)
Protection Class
2 – 1,2
2 – 1,4
2 – 1,7
2 – 2
2 – 2,5
Astigmatic Power
(D, m-1)
ID1-D2I
Color Perception
May suffer alteration except
for those marked 2C
May suffer alteration except
for those marked 2C
External
0.06 0.75
0.12 1.00
0.25* 1.00
To use in presence of sources emitting a
< 313 nm wavelength prevailing radiation
To use in presence of sources emitting an intense
radiation in both visibl and UV spectral area, thus
requiring attenuation of visible radiation.
Difference
Prismatic Powers (cm/m)
Horizontal
Internal
0.25
0.25
0.25
Specific Uses
Vertical
0.25
0.25
0.25