UHC Filter
UHC, Ultra High Contrast Filters, is a broadband astronomical filter suppressing urban mercury/sodium light and natural skyglow while passing nebular light. High transmission near OIII (496 nm and 500 nm), Hβ (486 nm), NII (654 nm and 658 nm), Ha (656 nm), and SII (672 nm) improves contrast and detail. Source sections: product images; dimensions and pricing; in-camera compatibility table; reference spectral curve; comparisons; gallery, Victoria Harbour Milky Way, UHC Filter ©Vincent Cheng. Packaging: silver-card carton, PP box, imported high-pressure white EVA. Notes: ambient light, display differences, and flash may affect color; interference coatings naturally change apparent color with lighting. The actual item governs, including design, appearance, or specifications changed before descriptions update. Series materials, workmanship, and process are identical; only size differs. Precision processing and strict control underpin the stated Yulong quality.
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