







π Unlock the cosmos in vivid detail β donβt just observe, experience!
The Astromania 1.25" O-III Filter is a high-grade optical accessory designed to enhance visual and astrophotographic observations of gaseous and planetary nebulae. It selectively transmits 95% of the double ionized oxygen emission lines (496-501nm), blocking nearly all other visible light to dramatically increase contrast. Compatible with all 1.25" eyepieces, it features anti-reflection coatings to reduce glare and ghosting, making it ideal for use in both light-polluted urban environments and dark sky locations. Each filter is individually tested and marked with its precise light transmittance for assured quality.








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