Appendix A: Technical Overview 129
Shortpass Filter
An SP filter has the opposite properties of a longpass filter. An SP filter passes
light with a shorter wavelength than the filter rating.
Bandpass Filter
A BP filter transmits a relatively narrow range or band of light. Bandpass filters
are typically designated by two numbers. The first number indicates the center
wavelength and the second refers to the width of the band of light that is passed.
For example, a 500/50 BP filter transmits light that is centered at 500 nm and has
a total bandwidth of 50 nm. Therefore, this filter transmits light between 475
and 525 nm (Figure A-5 on page 130).
wavelength (nm)
% transmission
shortpass
LSR2.book Page 129 Tuesday, April 25, 2006 3:34 PM
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