1.25UV+IR Block FilterThe Yulong UV+IR Blocker lets the full range of sensitivity of the human eye pass, and blocks all other parts of the spectrum in the UV and IR. The Yulong UV+IR Blocker is the ideal choice as a luminance filter for any kind of digital photography.Because of the perfect blocking of UV and IR all optical problems in these parts of the spectrum are avoided.The filter is optimized for systems with focal ratios between f/0.5 and f/50. The typical transmission is higher than 99%.... More>>

Yulong 2 H-Beta Visual FilterThe Yulong H-beta is a filter for visual observation, in particular with instruments of larger aperture. It lets the light of the H-beta emission line pass nearly unhindered and blocks the remaining spectral range to the extent that the eye is dark adapted. By the use of the Yulong H-beta filter, the contrast is increased so strongly, that even the observation of the Horse Head Nebulae with telescopes of 10 - 12 reaches the realm of the possible. ... More>>

ND9 filterThis ND9 neutral gray filter reduces the brightness and glare that can mask low contrast details during lunar and planetary visual observing. It does so without affecting the natural colors of the solar system object being observed. It can also be very effective when used with some webcam and DSI-type cameras to reduce the brightness of the Moon to keep from saturating the imaging detector during lunar photography. ... More>>

Yulong CLS FilterThe Yulong CLS blocks the light of the spectral lines of mercury and sodium-vapor lamps and lets the largest part of the visible light and H-alpha emissions pass. All the important emission lines, as well as the spectral region that the very well dark adapted eye can see, can pass through the filter.... More>>