Astrodon introduces the ExoPlanet-BB filter for use in amateur-scale telescopes to measure light curves of exoplanets.
Although it may not seem possible at first, astronomers with typical backyard equipment and sensitive CCD cameras have the capability to quantitatively measure small changes in light intensity as large exoplanets pass in front of their suns.
Based upon the extensive work of Bruce Gary in his recent book, "Exoplanet Observing for Amateurs", Chapter 7 concludes that a "clear with blue-blocking filter should be the amateur's default choice for exoplanets".
The Astrodon ExoPlanet-BB filter is that filter, where BB stands for "blue blocking". He concluded that this filter "has most of the high signal-to-noise advantages associated with unfiltered observing, yet it has most of the reduced systematics advantages associated with V-band and R-band observing.He recommended this filter for transiting expolanets, or BTEs, (those fainter than 10th magnitude) and for most telescopes <16 inches in diameter. He stated that the blue blocking creates a much smaller "air mass curvature" effect so that bluer stars could be measured as effectively as redder stars.