5Д

1) Hot mirror (reflects IR light)
2) horizontal low pass filter [1.0mm]
3) IR absorption filter [0.2mm]
4) λ/4 plate [0.25mm]
5) normal antireflective coating
30Д

1) Hot mirror (reflects IR light)
2) horizontal low pass filter [0.825mm].
3) λ/4 plate [0.425mm]
4) IR absorption filter [0.375mm]
5) vertical low pass filter [0.825mm]
6) normal antireflective coating.





