HOYA Standard Specifications

The Standard specifications of the filters we manufacture are as follows. We also customise our glasses and filters according to your requirements. Please ask our sales representatives for more details.

Quality ItemStandardHigh Precision
Reference Size50 mm x 50 mm50 mm x 50 mm
Clear Apparture90%90%
Standard Thickness (*)2.5 mm2.5 mm
Surface RoughnessP2 (Rq < 4 nm)P3 (Rq < 2 nm)
Flatness3/5(1); λ=632.8 nm3/3(1); λ=632.8 nm
Wavefront Distortion13/3(0.5); λ=632.8 nm13/1(0.5); λ=632.8 nm
ParallelismWithin 2 minutesWithin 1 minute
Bubbles, Inclusions1/6 X 0.161/3 X 0.063
Pits, Sleeks, Scuffs,Scratches, Bubbles and Inclusions on surface5/8 X 0.1
L3 X 0.016
(Total length of scratches should not exceed half of the clear aperture dimension which is defined as a circle of 90% in the center of the surface area)
5/3 X 0.063
L3 X 0.006
(Total length of scratches should not exceed half of the clear aperture dimension which is defined as a circle of 90% in the center of the surface area)
StriaeWithin specification of transmitted wavefrontWithin specification of transmitted wavefront
Chip Standard
Chamfer 0.3
Allowed within chamfer E0.25Allowed within chamfer E0.25

The above standards comply with ISO10110 series.

(*) Excludes thickness of LA/LB/ND filters
V11 and C filters follows HOYA colour filter catalogue. Standard thickness defines to meet optical characteristics according to HOYA filter catalogue.