Nebula Filter S-II 2-inch 6.5nm

Reveal Faint Nebulae Hidden by Light Pollution

Struggling to see faint nebulae through city lights? The Explore Scientific S-II Filter lets you observe deep-sky objects with clarity, without ever leaving your backyard.

Features

• 6.5nm Passband Bandwidth: Narrowband filter designed specifically to isolate the emission line of ionized sulfur (S-II) at 672nm, perfect for observing nebulae and faint celestial objects.
• Blocks Artificial Light: Absorbs almost all unwanted artificial light, significantly reducing the effects of light pollution for clearer night sky views.
• Enhanced Contrast & Detail: Improves visibility of faint planetary nebulae, emission nebulae, and supernova remnants by enhancing contrast and filtering out interfering wavelengths.
• Premium Build Quality: Manufactured with high-quality optical materials, ensuring durability and precision for both amateur and professional use.
• Individual Test Report Included: Each filter comes with a personalized test report, guaranteeing premium performance and quality assurance.
• Astrophotography Ready: Ideal for astrophotographers, allowing for stunning deep-sky object captures, even in light-polluted urban areas.
• Universal 2-Inch Compatibility: Fits all 2-inch telescope eyepieces and astrophotography setups, making it versatile for a wide range of users.

The Explore Scientific S-II Nebula Filter is for you if…

• You struggle to observe deep-sky objects like nebulae due to light pollution in urban or suburban environments.
• You’re an astrophotographer looking to capture stunning images of emission nebulae and planetary nebulae without interference from unwanted light.
• You want to enhance the contrast and clarity of faint celestial objects, even when the sky is not perfectly dark.
• You need a high-quality, durable filter that’s been individually tested to meet professional standards.
• You’re passionate about visual astronomy or astrophotography and want a reliable tool to significantly improve your observing and imaging experience.

When it comes to observing faint deep-sky objects like emission nebulae, planetary nebulae, and supernova remnants, light pollution can be a frustrating barrier—especially if you live in a city or suburb. The Explore Scientific S-II 2-inch 6.5nm Nebula Filter is designed specifically to overcome this issue. It isolates the emission line of ionized sulfur (S-II) at exactly 672nm, blocking almost all other wavelengths of light, including streetlights, building lights, and other sources of artificial illumination. This allows you to see celestial objects that would otherwise be drowned out, revealing faint nebulae in areas of the sky that appear completely dark without the filter.

The filter’s narrow 6.5nm passband enhances contrast and brings out fine details in objects like the Crab Nebula (M1) or the Helix Nebula (NGC 7293), which emit strongly in the sulfur line. You’ll notice nebulae that were previously invisible come to life, with sharper edges and more defined structures. For astrophotographers, this filter is a game changer, as it significantly reduces light pollution, making your long-exposure shots clearer, with less noise and more vibrant, accurate colors. The filter is especially effective for capturing the intricate filaments of supernova remnants, like the Veil Nebula (NGC 6992/95), with greater precision.

This filter is built with precision optical glass, ensuring durability and clarity over time, and it’s compatible with any telescope that accepts 2-inch eyepieces or camera adapters. You don’t need to worry about whether it will fit your setup—it’s designed for broad compatibility. Plus, every Explore Scientific S-II Filter comes with an individual test report, so you know exactly what you’re getting: a premium product with verified performance. This level of quality assurance ensures that the filter will meet your needs for high-contrast observation and photography of nebulae and supernova remnants, even in light-polluted areas.

If you’ve been disappointed with faint, washed-out views of deep-sky objects due to light pollution, or if you’re an astrophotographer looking to enhance your nebula images, the Explore Scientific S-II Filter is the tool you’ve been missing. Instead of traveling hours to find darker skies, you can turn your city backyard or suburban rooftop into a stargazing haven, revealing celestial wonders you never thought possible. Don't let light pollution hold you back from experiencing the night sky in all its beauty—this filter lets you unlock the full potential of your telescope and camera.