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Lagoon or Swan nebulae
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You can shoot 360° panoramas
And also fit some barlow lens with filter threads
OPTOLONG 2" L-Synergy Filter Dual 7nm Narrowband Filter OIII(500.7nm)&SII(672.4nm) magnetic Lagoon or Swan nebulaeL Synergy is a dual 7nm narrowband filter ( M48*0. 75mm thread ) compatible with DSLR cameras, color CMOS sensors, and CCD cameras, supporting telescope systems with F ratio of F3. 3 or above (slower system. Its key advantage lies in enabling astrophotography amateurs to capture exceptionally detailed emission nebulae even in light polluted environments. After years of technical refinement, it has been optimized to minimize bright star halos while
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