L-Para Dual-Narrowband Filter
L-Para is a new dual-narrowband 10 nm light-pollution filter. Its OIII (500.7 nm) and H-Alpha (656.3 nm) signal bands both have a half-bandwidth of 10 nm. In systems with focal ratios of F2 and above, transmission of the nebular OIII and Ha emission lines exceeds 85%, while effectively filtering light-pollution emission from mercury lamps, sodium lamps, LEDs, and similar sources. Excellent contrast and halo suppression enable detailed, vivid nebula images. L-Para suits ordinary optical systems as well as fast systems such as RASA and Hyperstar. It maintains high transmission even at oblique incidence for clear, precise imaging.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Specifications | 2.0" |
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