• Visual and photographic UHC-L Nebula filter with highest transmission
• Ultra High Contrast L Filter blocks city lights and increases contrast of nebula and comets (C2 lines)
• Can be used as LED-opimized Luminance filter for RGB-Imaging with sky glow suppression
• Blue transmission optimized to block blueish sky glow caused by LED car- and streetlights.
• Creates a much brighter image than a conventional Nebula filter
• Ideal for deep-sky observers. This UHC-L filter is the perfect visual complement to narrowband OIII filters.
• Reflex-Blocker hard coated and Plane-optically polished with sealed coating edges (Life-Coat)
• Blackened edges all around, with filter-lead-side-indicator in the form of a telescope-sided black outer rim

Baader UHC-L Nebula filter with highest transmission, realistic star colors, also usable as highly effective LED-optimized luminance filter for LRGB imaging.?

The Baader UHC-L filter is the classic all-round “light pollution rejection filter”, but now also blocked against the main LED emissions in the blue part of the spectrum. The band-pass curve corresponds to a widedual-band filterwithout distortingstar colors. The two band-passestransmit all light emitted by the known gas nebulae (the H-alpha and H-beta lines of fluorescent hydrogen as well as the OIII line of oxygen), while both the atmospheric most disturbing stray light from LED lamps and intense bluish car headlights as well as further stray light from classical street lamps and the natural night sky glow (airglow/sky glow) of the atmosphere are blocked to a large extent. At the same time, the UHC-L filter is coatedwith latest technology (CMOS-optimized) and therefore blocks false light much more effectivethan all previous UHC filters.

Use of the UHC-L filter

The application of the UHC-L happensmainly in visual and photographic observation of emission nebulae (star forming regions, planetary nebulae, supernova remnants) undermedium to highly polluted skies. Its use is also interesting forcomet observation: It passes the OIII line at 501nm as well as the two C2 lines at 511nm and 514nm which are characteristic for the gas tail of many comets.

This UHC-L filteris the successor of the well-proven plane-optical polished Baader UHC-S filter. It