SVBONY SV220 Dual-Band Nebula Filter 7nm (Ha+Oiii) 2″

SVBONY 7nm dual band filter is designed to drastically reduce the effect of light pollution. The 7nm bandwidth means it strongly isolates the nebulae’s emissions into H-Alpha (red) and OIII (green-blue) from anything else. It blocks light pollution, maximizes the signal from nebulae, and darkens the sky background. It also blocks artificial light from mercury vapor lamps, high- and low-pressure sodium vapor lights, and unwanted natural light caused by the emission of neutral oxygen in our atmosphere.

Svbony 2″ SV220 Dual-Band 7nm Nebula Filter is a professional astronomical filter that allows you to photograph planetary and emission nebulae and supernova remnants near cities and other areas polluted by sodium and mercury lamp light.

This filter is characterized by high transmittance for the Hα (656.3 nm) and OIII (500.7 nm) bands, while maintaining the ability to effectively cut out spectral lines emitted by city lighting, significantly improving c thus contrast in the obtained images. The improvement in contrast and detail of photographs is also due to the narrow transmission window, whose half-width for both transmitted lines is only 7 nm. The spectral characteristics selected in this way enable very good separation of red and blue-green light from other undesirable lines, and thus maximize the signal coming from the photographed objects.

The filter can be used with telescopes with a light intensity not exceeding f/5.

The most important features of the Svbony 2″ SV220 Dual-Band 7nm Nebula Filter

• two-band nebular filter made of high-quality substrate
• recommended for use with telescopes with a maximum light intensity of f/5
• high transmission for the Hα and OIII lines with a half-width transmittance window of 7 nm
• efficient removal of light pollution

Dual Narrow Bandwidth H-Alpha/O-III 7nm Narrowband Filter Properly Designed For astrophotography of emission nebulae, planetary nebulae and supernova remnants. The high transmission and sharp cut-off greatly enhances the contrast of image and brings out the most detailed information of those deep-sky objects.

The 7nm dual-band filter allows OIII (500.7nm) and H-Alpha (656.3nm) nebula emission lines to be highly transparent, strongly isolates the nebulae’s emissions into H-Alpha (red) and OIII (green-blue), and drastically reduces the effect of light pollution.

You can enjoy the fun of nebula shooting at anytime and anywhere in light pollution city or under a full moon. You don’t have to to travel through mountains and rivers for your photography, and your traffic fuel and time are also saved.