L-Ultimate 3nm Dual-Narrowband Filter
L-Ultimate is a dual-3nm narrowband filter with high transmission at OIII (500.7nm) and Ha (656.3nm) and blocking >OD4 elsewhere, effectively rejecting urban light pollution, skyglow, and other backgrounds. It works with DSLRs and color/monochrome CMOS and CCD astronomy cameras but is unsuitable for fast imaging systems. Even under severe pollution it enables rich, layered nebula images. We consider it an ideal choice in heavily polluted backyards, rooftops, or balconies, isolating all emission lines outside OIII (500.7nm) and Ha (656.3nm) while maximizing useful signal. Source spectral/halo test notes: based on celestial and pollution emission lines, optimized dual passbands retain colors of emission/reflection nebulae while filtering most pollution, as shown in the spectrum. The product will continue to be optimized through testing; this curve is not final product data. Halo field tests: halos depend on the whole optical system, including telescope, camera microlenses, and cover-glass reflections. Tests therefore use different equipment and bright-star magnitudes. 100% bright-star enlargement. Target one: Tianjin Si (+1.24 magnitude). Equipment: Tianhu 70SA+ASI 2600MC+L-Ultimate, 180s exposure. 100% enlargement. Target two: Tianjin Yi (+2.22 magnitude). Equipment: Tianhu 70SA+ASI 2600MC+L-Ultimate, 300s exposure. Target three: NGC6960 (+4.22 magnitude). Equipment: Omegon 571C+Skywatcher 200/1000 F4+L-Ultimate, 300s exposure. 100% enlargement. Target four: Vega (+0.02 magnitude). Equipment: Yuzhong 70SA+ASI 2600MC+L-Ultimate, 180S exposure. From refractors to Newtonian reflectors and magnitude 4.22 to 0.22, L-Ultimate delivers impressive halo performance.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Specifications | 2.0"-M48*0.75 |
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