FF8 - Hoya

Diagram n (λ)

n calculation

Diagram τ (λ)

τ calculation

Analogue search

Main parameters
n_d = 1.752109 n_e = 1.759180	V_d = 25.04 V_e = 24.84	n_F - n_C = 0.030027 n_F' - n_C' = 0.030560	Coloring: 0.37 - 0.43 mkm.

Type: Schott
Spectral range: 0.40466 - 1.014 mkm.
C1 = 2.9564361 C2 = -0.019762195 C3 = 0.029878823 C4 = 0.0051830852 C5 = -0.00054202389 C6 = 0.000048463245

Refraction index
n _2.3254	-----
n _1.9701	-----
n _1.5296	-----
n _1.06	-----
n _t	1.723260
n _s	1.729689
n _r	1.738865
n _C	1.743520
n _C'	1.744853
n _0.6328	1.746111
n _D	1.751851
n _d	1.752109
n _e	1.759180
n _F	1.773547
n _F'	1.775414
n _g	1.792141
n _h	-----
n _i	-----
n _0.3341	-----
n _0.3126	-----
n _0.2967	-----
n _0.2804	-----
n _0.2483	-----

Relative partial dispertion
P_C,t	0.6747
P_C,A'	0.3046
P_d,C	0.2860
P_e,C	0.5215
P_g,d	1.3331
P_g,F	0.6192
P_h,g	-----
P_i,g	-----
P_C',t	0.7191
P_e,C'	0.4771
P_F',e	0.5406
P_i,F'	-----

transmittance: 5 mm
τ_1.55	0.992
τ_1.5	0.991
τ_1.4	0.99
τ_1.3	0.998
τ_1.2	0.998
τ_1.1	0.998
τ_1.06	0.998
τ_1.05	0.998
τ₁	0.998
τ_0.95	0.998
τ_0.9	0.998
τ_0.85	0.998
τ_0.83	0.998
τ_0.8	0.998
τ_0.78	0.998
τ_0.75	0.998
τ_0.7	0.997
τ_0.65	0.997
τ_0.6	0.996
τ_0.55	0.993
τ_0.5	0.988
τ_0.48	0.984
τ_0.46	0.98
τ_0.44	0.973
τ_0.42	0.96
τ_0.4	0.9
τ_0.39	0.82
τ_0.38	0.66
τ_0.37	0.37
τ_0.36	0.05

transmittance: 10 mm
τ_1.55	0.984
τ_1.5	0.982
τ_1.4	0.98
τ_1.3	0.996
τ_1.2	0.997
τ_1.1	0.996
τ_1.06	0.997
τ_1.05	0.996
τ₁	0.996
τ_0.95	0.996
τ_0.9	0.996
τ_0.85	0.996
τ_0.83	0.996
τ_0.8	0.997
τ_0.78	0.996
τ_0.75	0.996
τ_0.7	0.995
τ_0.65	0.993
τ_0.6	0.991
τ_0.55	0.986
τ_0.5	0.976
τ_0.48	0.969
τ_0.46	0.959
τ_0.44	0.946
τ_0.42	0.91
τ_0.4	0.81
τ_0.39	0.67
τ_0.38	0.44
τ_0.37	0.14

Knoop hardness: 425
Abrasion: 250

Staining: 1
Resistance to acids: 1

Temperature coefficient of linear expansion
Temp. range, C	Value, 1/C*10^-7
100 ~ 300	76