Sellstrom DP4 - Optical Class Definitions; Optical Class Specifications; UV Filter Recommendations

Data regarding ocular of model DP 4 CV (Clear Visor ) for his appropriate use.
Recommendations for users of UV lters (EN 170)
Optical Class
Optical
Class
Spherical Power
(D, m-1)
Astigmatic-Power
(D, m-1)
(D1+D2)/2 ID1-D2I
1 + - 0.06 0.06
2 + - 0.12 0.12
3* + 0.06
– 0.25
0.25*
Dierence
Prismatic Powers (cm/m)
Horizontal
Vertical
External Internal
0.75
0.25
0.25
1.00
0.25
0.25
1.00
0.25
0.25
WARNING: Oculars in optical Class 3 are not intended for long term use!
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°.
Protection Class Color Perception Specic Uses
2 - 1,2
May suer alteration except for those
marked 2C
To use in presence of
sources emitting a < 313 nm
wavelength prevailing radiation
2 - 1,4
2 - 1,7
2 – 2
2 – 2,5
May suer alteration except for those
marked 2C
To use in presence of
sources emitting an intense
radiation in both visibl and UV
spectral area, thus
requiring attenuation of visible
radiation.
INST-DP4 rev. 7
Product that works.