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AST OPTICS NIKON M48 T-RING WITH INTEGRATED L-PROFESSIONAL (LPS) FILTER
L-Pro (L-Professional) is a multi-bandpass filter which selectively suppresses the transmission of light pollution lines. For example, mercury vapor lamps, high and low pressure sodium vapor lights and skyglow caused by emission from neutral oxygen in our atmosphere.
L-Pro enhances the transmission of major emissions from nebula while offering great colour balance with its wide yet effective light pollution cutting transmission band. The balanced transmission allows objects with wide emission spectrum such as galaxies to be imaged with minimal colour cast (easier to correct in post-processing). Among the emission lines enhanced are OIII (496, 500nm), H-beta (486nm), NII (654, 658nm), H-alpha (656nm) and SII (672nm).
HIGHLIGHTS
- 90% transmission at major nebula emission lines
- Multi-layers anti-reflection coating
- Precise and sharp roll-off at light pollutant lines
- 2 mm filter thickness
- Made on Schott substrate
- Finely polished to 1/4 wave accuracy
- Surface quality: 60/40 (MIL-O-13830 standard)
- Suitable for all Nikon bodies, also Full Frame!
- M48 thread on telescope side
- 45,9mm filter diameter
