{"id":92543,"date":"2026-01-06T10:08:44","date_gmt":"2026-01-06T09:08:44","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=92543"},"modified":"2026-10-13T11:15:00","modified_gmt":"2026-10-13T09:15:00","slug":"omegon-pro-h-alpha-filter-7nm-1-25-inches","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/omegon-pro-h-alpha-filter-7nm-1-25-inch\/","title":{"rendered":"Omegon Pro H-Alpha Filter 7nm 1.25 inch"},"content":{"rendered":"

Omegon Pro H-Alpha Filter 7nm 1.25 inch: photographing hydrogen clouds from the city<\/strong><\/h2>\n\n\n\n

With a diameter of only 7 nanometers, this filter captures hydrogen clouds with high contrast, even under a light-polluted sky. H-alpha is the wavelength at which city astrophotography becomes realistic.<\/p>\n\n\n\n

\"Omegon<\/figure>
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Only the red nightlight<\/h4>\n\n\n\n

The filter only allows through H-alpha light and blocks virtually all other wavelengths. Artificial light from sodium and mercury vapor lamps is effectively suppressed, leaving the background in your shot dark.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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7 nm versus 12 nm<\/h4>\n\n\n\n

Compared to a 12-nanometer filter, this narrower aperture delivers more visible contrast and finer structure in clouds. Less background light means you can expose longer before the background darkens.<\/p>\n<\/div>\n<\/div>\n\n\n\n

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Part of a set<\/h4>\n\n\n\n

In the classic Hubble spectrum, H-alpha forms together with OIII and SII the three channels from which you build a color image. All three are available in the same 7 nm version.<\/p>\n<\/div>\n<\/div>\n\n\n\n

Featured accessories<\/h3>\n\n\n\n

Combine with the Pro OIII 7nm and Pro SII 7nm for a complete narrowband set. A 1.25-inch filter wheel allows you to switch between channels without touching the setup.<\/p>\n\n\n\n

For whom yes and for whom no<\/h3>\n\n\n\n