LP-2 Narrowband for 1.25" eyepieces

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This 1.25” narrowband filter has a 280 Ångstrom passband for visually observing emission nebulas from heavily light-polluted areas. The filter has excellent transmission (generally well in excess of 95-96%) at all the visually important emission lines of hydrogen-beta at 4861Å and doubly ionized oxygen at 4959Å and 5007Å. This combines with the narrow passband to make emission nebulas stand out briskly against a dark sky. It has very steep passband cutoff slopes, to provide higher contrast than conventional narrowband filters that have more gradual transition slopes. It can also be useful in hunting down and enhancing very faint nebulas from a dark sky observing site. It is not designed for astrophotography or for observing reflection nebulas. It has twice the contrast of the Thousand Oaks broadband filter, making it ideal for faint nebulas such as the Helix, Rosette, Veil, and North American. Brighter nebulas (such as the Omega, Dumbbell, Lagoon, etc.) stand out well under city lights. All coatings are sandwiched between two layers of glass to protect them against accidents and too-aggressive cleaning.

Enter your telescope focal ratio in the formula box to the right to see what focal length eyepieces will work best with this filter.

Min City Exit Pupil:
1mm
Max City Exit Pupil:
4mm
Min Dark Site Exit Pupil:
6mm
Max Dark Site Exit Pupil:
2mm
Weight:
The weight of this product.
2 ozmm
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Helpful Formulas
Light Pollution Filter Formula
Enter your telescope focal ratio in the formula box below to see what focal length eyepieces will work best with this filter.
Enter Your Telescope Information:
Your Telescope Focal Ratio: f/
  
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Thousand Oaks - LP-2 Narrowband for 1.25" eyepieces

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Thousand Oaks - LP-2 Narrowband for 1.25" eyepieces
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Our Product #: LP21
Manufacturer Product #: LP-225
Price: $79.50  Ground shipping for this item is $8.95 - Click for more info
By adding 1 of these items to your cart your order total will be less than $100, and will ship within the 48 contiguous United States for $8.95. Add $20.50 to your order, however, and you qualify for free ground shipping (heavy items with fixed shipping, such as counterweights, excluded).
MSRP: $89.00
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This 1.25” narrowband filter has a 280 Ångstrom passband for visually observing emission nebulas from heavily light-polluted areas. The filter has excellent transmission (generally well in excess of 95-96%) at all the visually important emission lines of hydrogen-beta at 4861Å and doubly ionized oxygen at 4959Å and 5007Å. This combines with the narrow passband to make emission nebulas stand out br . . .





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