Optolong 3nm H-Alpha (2")

Warning: As a critical safety reminder, this Optolong filter is not intended for solar observation. It should NEVER be used to observe the sun directly, as it can result in irreversible blindness. EDISLA does not assume responsibility for any incidents that may occur due to improper usage.

H-Alpha 3nm filters are a popular narrowband filter allowing 3nm bandwidth of light centered on a wavelength of 656nm through, and reducing light pollution and unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). This is the better choice of narrowband H-Alpha astrophotographer filter for highest contrast and revealing subtle nebula details. 

The narrowband S-II 3nm filter  (Sulfur II for CCD) is designed for nebula observation allowing 3nm bandwidth of light centered on a wavelength of 672nm, and reducing light pollution and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow)

Introducing the Optolong SHO-3nm Narrowband Filters:

The Optolong SHO-3nm filters are designed for advanced astronomical observations and astrophotography. These filters are primarily intended for use with astronomical monochrome cooling CCD cameras and modified DSLRs, allowing astrophotographers to capture stunning images and process them using astronomical post-processing software to achieve Hubble-like results.

Filter Details:

H-Alpha 3nm Filter: This filter is designed to transmit a 3nm bandwidth of light centered on the H-Alpha wavelength of 656nm. It enhances the contrast of objects by decreasing background noise and increasing the visibility of faint nebula signals. H-Alpha observations are crucial for revealing the intricate structures of celestial objects.

Key Features:

• Higher Contrast and Detailed Viewing: The SHO-3nm filters enhance contrast and provide greater detail when viewing astronomical objects.

• Decreased Background Noise: By selectively blocking unwanted wavelengths, these filters reduce background noise, resulting in clearer and more detailed observations.

• Increased Nebula Signal Brightness: These filters boost the visibility of faint nebula signals, making them appear brighter and more prominent.

• Hubble-Like Image Processing: When used as a kit, the narrowband filters allow astrophotographers to process images resembling those captured by the Hubble Space Telescope.

• Substrate and Coating Upgrades: The filters have been optimized through substrate enhancements and advanced coating technology, ensuring high performance and durability.

The Optolong SHO-3nm Narrowband Filters are a valuable asset for astronomers and astrophotographers seeking to capture and process high-quality astronomical images with exceptional contrast and detail. These filters are specially designed to combat light pollution and extract the full beauty of celestial objects.

Understanding the Chart for Optolong SHO-3nm Narrowband Filters:

To interpret the chart for the Optolong SHO-3nm Narrowband Filters, follow these guidelines:

Horizontal Axis (X-axis):

• The horizontal axis represents the Wavelength in Nanometers (nm).
• It shows the range of wavelengths of light, measured in nanometers, that the filters are designed to interact with.

Vertical Axis (Y-axis):

• The vertical axis represents Transmission in %.
• It indicates the percentage of light at each specific wavelength that passes through the filter.

Lines on the Chart:

• The BLUE line on the chart corresponds to the transmission of the OIII 3nm filter.

  • It shows how much of the light at different wavelengths within the 3nm bandwidth centered on 500nm (OIII emission line) is allowed to pass through the filter.

• The GREEN line represents the transmission of the H-Alpha 3nm filter.

  • It illustrates the filter's ability to transmit light in the 3nm bandwidth centered on the H-Alpha wavelength at 656nm.

• The RED line shows the transmission of the SII 3nm filter.

  • It indicates the filter's transmission characteristics within the 3nm bandwidth centered on the Sulfur II (SII) wavelength at 672nm.

By examining these lines on the chart, you can understand how each filter behaves across the spectrum of visible light. This information is essential for astronomers and astrophotographers when selecting filters for specific observations and image processing to capture the unique characteristics of celestial objects emitting at these wavelengths.