11.15nm
spread of ray centers for a 3 nm filter in an f/2 beam tilted 10°
One number, explained
Each page takes one number from a filter or photodiode datasheet, states what it is measured under, shows where it misleads and computes it live from your own inputs.
OD 4.30
two OD 4 reflective blockers mounted parallel
Two OD 4 filters are not OD 8
98.8%
share of parts inside ±1 nm when the spread is 0.4 nm
Typical is not a limit
2.54nm
width of a ±1 nm window after +6 pm/K over −20 to +70 °C
A center wavelength tolerance holds at one temperature
2.8 × 10⁻¹⁴W/√Hz
NEP of a 0.65 A/W diode with 1 nA dark current and 1 GΩ shunt
Responsivity and NEP from first principles
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