Optolong SHO-3nm Telescope Filter Kit - 36mm (Φ36*2.0mm unmounted)

• For tricolor CCD astrophotography
• Narrowband imaging with SHO set can be done with the moon up in heavy light pollution, so your equipment is not sitting dormant for several weeks
• Hubble look of images can be made by the combination of H-alpha, OIII-CCD, and SII-CCD, such as the famous “Pillars of Creation” (M16 Eagle Nebula)

Introducing the Optolong SHO-3nm Narrowband Filters Kit:

The Optolong SHO-3nm filter kit is designed for advanced astronomical observations and astrophotography. This kit includes three specialized narrowband filters: SII 3nm, H-Alpha 3nm, and OIII 3nm, each optimized for specific wavelengths and emissions. 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:

1. SII 3nm Filter (Sulfur II for CCD): This filter is engineered to allow a 3nm bandwidth of light centered on a wavelength of 672nm to pass through. It selectively reduces the transmission of certain wavelengths of light, especially those generated by artificial light sources such as mercury vapor lamps, high-pressure sodium vapor lights, low-pressure sodium vapor lights, and unwanted natural light produced by neutral oxygen emissions in Earth's atmosphere. It's an essential tool for capturing detailed nebula observations.

2. 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.

3. OIII-CCD 3nm Filter (Oxygen III for CCD): The OIII-CCD 3nm filter is tailored to allow a 3nm bandwidth of light centered on a wavelength of 500nm, corresponding to the OIII emission line. Like the other filters in the kit, it reduces the transmission of specific wavelengths of light, including those emitted by artificial light sources and natural light caused by neutral oxygen emissions. OIII is known for emitting at 495.9nm and 500.7nm, producing a distinctive blue-green color. It is frequently used to capture detailed images of planetary nebulae and supernova remnants.

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 Kit is 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.