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Telescope Nebula Filters
Nebular filters, also called Light Pollution (LP or LPR) Reduction filters, are used to view faint, deep-sky objects in your telescope if you cannot access a dark-sky location outside of a city. They are a "nice-to-have" telescope accessory. If you can only pick one filter, get a narrowband filter. Be sure and get one that is labelled "UHC" or Ultra-High Contrast.
| LP Filter Type |
Bandpass |
When Used |
| Broadband filters |
442nm-532nm (90nm) |
General; astrophotography |
| Narrowband filters |
482nm-506nm (24 nm) |
Emission nebulas |
| Oxygen-III filters |
496nm-501nm (11nm) |
Planetary nebulas,
supernova remnants |
| H-Beta filters |
482nm-489nm (9nm) |
Horsehead nebula,
California nebula |
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