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Showing 1–12 of 35 results
  • Astrodon 20 nm Filters – H-α 20nm (Close-Out)

    $350.00$360.00

    H-α (hydrogen-alpha) at 656 nm (nanometers) is deep red in color and the most popular narrowband filter, and this 20nm H-α is the same formulation but in a wider bandpass. Hydrogen is ubiquitous in the cosmos and is present in emission nebula (North American, Pelican), planetary nebula (Dumbbell, Ring), Wolf-Rayet objects (Crescent, Thor’s Helmet) and supernova remnants (Veil). Many imagers like to present just a black-and-white H-α image of an object. It is has a beauty all by itself, like an Ansel Adams photo.

     

     

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  • Astrodon H-β filter, 15nm bandpass (Close-Out)

    $350.00$360.00

    This filter isolates only the hydrogen-beta line of the spectrum (486nm) in a 15nm wide bandpass.

     

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  • Astrodon NIR Filters (Close-Out)

    $234.00$630.00
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  • Astrodon Close-Out Johnson-Cousins Filters: discontinued, special order remnants, odd sizes, etc.

    $200.00$1,250.00

    These are high quality Astrodon Photometric Johnson-Cousins filters left over from Special Orders and over production. Many are types and/or sizes not commonly in production.

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  • Astrodon Close-Out Sloan Filters: discontinued, special order remnants, odd sizes, etc.

    $75.00$1,000.00

    These are high quality Astrodon Photometric Sloan filters left over from Special Orders and over production. Many are types and/or sizes not commonly in production.

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  • Astrodon Close-Out Stromgren Filters: discontinued, special order remnants, odd sizes, etc.

    $500.00$1,000.00

    These are high quality Astrodon Photometric Stromgren filters left over from Special Orders and over production. Many are types and/or sizes not commonly in production.

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  • JMI 10 Inch Pneumatic Wheels with Tow Handle for Universal Wheeley Bars with 1/2″ Leveling Screws (Scratch and Dent Discount)

    $259.00 $220.00

    Scratch and Dent Discount! Minor blemishes do not affect performance.

    JMI 10 Inch Pnumatic Wheels – Universal Style Wheeley Bars ONLY for Wheeley Bars with 1/2″ leveling screws.

    Upgrade your JMI medium or large wheeley bar system with JMI 10 Inch Pneumatic Large Wheels – Universal Style Wheeley Bars.

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  • Astrodon 3 nm Narrowband Filter, 36mm Round – OIII3_36R-2000160 (2nd Quality Discount)

    $748.00 $635.00

    This individually serialized filter, OIII3_36R-2000160, has been scored at 9.8 and has a 15% discount. Astrodon 2nd Quality filters are still covered by our warranty for longevity, but are otherwise sold “as is” and are not returnable.

    Astrodon 2nd Quality Filters are sold at a discount. 2nd Quality Filters are individually evaluated and graded for edge chips, scratches, pinholes and inclusions according to the standards set below:

    Edge Chips: Score 1 point for each edge chip. Score 1 additional point for each edge chip that extends into the filter more than 2mm from the edge.

    Pin holes: Score 1 point for each pinhole. Score an additional point for each pinhole that is “large”.

    Scratches: Score 1/2 point for each scratch.

    Inclusions: Score 1/2 point for each inclusion.

    Subtract the sum of the points from 100 and divide by 10. This is the filter score.

    Bring Out The Faint Structures In Nebulae
    Astrodon Narrowband filters set a new bar of performance and durability for imaging and research. We offer 5 nm and ultra-narrow 3 nm bandwidths.

    Astrodon OIII filters have a center bandwidth of 500.1 nm.

     

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  • Astrodon 3 nm Narrowband Filter, 36mm, SII3_36R-2000151 (2nd Quality Discount)

    $748.00 $635.00

    This individually serialized filter, SII3_36R-2000151, has been scored at 9.8 and has a 15% discount. Astrodon 2nd Quality filters are still covered by our warranty for longevity, but are otherwise sold “as is” and are not returnable.

    Astrodon 2nd Quality Filters are sold at a discount. 2nd Quality Filters are individually evaluated and graded for edge chips, scratches, pinholes and inclusions according to the standards set below:

    Edge Chips: Score 1 point for each edge chip. Score 1 additional point for each edge chip that extends into the filter more than 2mm from the edge.

    Pin holes: Score 1 point for each pinhole. Score an additional point for each pinhole that is “large”.

    Scratches: Score 1/2 point for each scratch.

    Inclusions: Score 1/2 point for each inclusion.

    Subtract the sum of the points from 100 and divide by 10. This is the filter score.

    If you want the look of Hubble Space Telescope (HST) images, such as the famous “Pillars of Creation” (the Eagle Nebula, Messier 16), then the next filter to consider adding to your collection after H-a and OIII is the SII (es-two) or sulfur filter. The SII filter, like H-a, is a deep red filter near 672 nm. H-a, OIII and SII filters provide that Hubble look for many emission nebula. Again, tri-color narrowband imaging with these three filters can be done with the moon up, so your equipment is not sitting dormant for several weeks.

    Astrodon SII filters have a center bandwidth of 671.6nm

     

     

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  • Astrodon 3 nm Narrowband Filter, 36mm, – HA3_36R-2000138 (2nd Quality Discount)

    $748.00 $654.00

    This individually serialized filter, HA3_36R-2000138, has been scored at 9.9 and has a 12.5% discount. Astrodon 2nd Quality filters are still covered by our warranty for longevity, but are otherwise sold “as is” and are not returnable.

    Astrodon 2nd Quality Filters are sold at a discount. 2nd Quality Filters are individually evaluated and graded for edge chips, scratches, pinholes and inclusions according to the standards set below:

    Edge Chips: Score 1 point for each edge chip. Score 1 additional point for each edge chip that extends into the filter more than 2mm from the edge.

    Pin holes: Score 1 point for each pinhole. Score an additional point for each pinhole that is “large”.

    Scratches: Score 1/2 point for each scratch.

    Inclusions: Score 1/2 point for each inclusion.

    Subtract the sum of the points from 100 and divide by 10. This is the filter score.

    H-α (hydrogen-alpha) at 656 nm (nanometers) is deep red in color and the most popular narrowband filter. Hydrogen is ubiquitous in the cosmos and is present in emission nebula (North American, Pelican), planetary nebula (Dumbbell, Ring), Wolf-Rayet objects (Crescent, Thor’s Helmet) and supernova remnants (Veil). Many imagers like to present just a black-and-white H-α image of an object. It is has a beauty all by itself, like an Ansel Adams photo. However, most imagers blend their H-a data into their red RGB data to enhance structural detail while maintaining a “natural” look. Therefore, the H-α filter should be your first narrowband addition to your LRGB filters. The basic imaging set of 5 filters becomes LRGBH-α.

    Astrodon H-α filters have a center bandwidth of 656.3 nm

     

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  • Astrodon 5 nm Narrowband Filter, 1.25 inch, – HA5_27R-20004 (2nd Quality Discount)

    $380.00 $237.00

    This individually serialized filter, HA5_27R-20004, has been scored at 8.9 and has a 37.5% discount. Astrodon 2nd Quality filters are still covered by our warranty for longevity, but are otherwise sold “as is” and are not returnable.

    Astrodon 2nd Quality Filters are sold at a discount. 2nd Quality Filters are individually evaluated and graded for edge chips, scratches, pinholes and inclusions according to the standards set below:

    Edge Chips: Score 1 point for each edge chip. Score 1 additional point for each edge chip that extends into the filter more than 2mm from the edge.

    Pin holes: Score 1 point for each pinhole. Score an additional point for each pinhole that is “large”.

    Scratches: Score 1/2 point for each scratch.

    Inclusions: Score 1/2 point for each inclusion.

    Subtract the sum of the points from 100 and divide by 10. This is the filter score.

    H-α (hydrogen-alpha) at 656 nm (nanometers) is deep red in color and the most popular narrowband filter. Hydrogen is ubiquitous in the cosmos and is present in emission nebula (North American, Pelican), planetary nebula (Dumbbell, Ring), Wolf-Rayet objects (Crescent, Thor’s Helmet) and supernova remnants (Veil). Many imagers like to present just a black-and-white H-α image of an object. It is has a beauty all by itself, like an Ansel Adams photo. However, most imagers blend their H-a data into their red RGB data to enhance structural detail while maintaining a “natural” look. Therefore, the H-α filter should be your first narrowband addition to your LRGB filters. The basic imaging set of 5 filters becomes LRGBH-α.

    Astrodon H-α filters have a center bandwidth of 656.3 nm

     

    Add to cart
  • Astrodon 5 nm Narrowband Filter, 1.25 inch, – HA5_27R-20005 (2nd Quality Discount)

    $380.00 $313.00

    This individually serialized filter, HA5_27R-20005, has been scored at 9.7 and has a 17.5% discount. Astrodon 2nd Quality filters are still covered by our warranty for longevity, but are otherwise sold “as is” and are not returnable.

    Astrodon 2nd Quality Filters are sold at a discount. 2nd Quality Filters are individually evaluated and graded for edge chips, scratches, pinholes and inclusions according to the standards set below:

    Edge Chips: Score 1 point for each edge chip. Score 1 additional point for each edge chip that extends into the filter more than 2mm from the edge.

    Pin holes: Score 1 point for each pinhole. Score an additional point for each pinhole that is “large”.

    Scratches: Score 1/2 point for each scratch.

    Inclusions: Score 1/2 point for each inclusion.

    Subtract the sum of the points from 100 and divide by 10. This is the filter score.

    H-α (hydrogen-alpha) at 656 nm (nanometers) is deep red in color and the most popular narrowband filter. Hydrogen is ubiquitous in the cosmos and is present in emission nebula (North American, Pelican), planetary nebula (Dumbbell, Ring), Wolf-Rayet objects (Crescent, Thor’s Helmet) and supernova remnants (Veil). Many imagers like to present just a black-and-white H-α image of an object. It is has a beauty all by itself, like an Ansel Adams photo. However, most imagers blend their H-a data into their red RGB data to enhance structural detail while maintaining a “natural” look. Therefore, the H-α filter should be your first narrowband addition to your LRGB filters. The basic imaging set of 5 filters becomes LRGBH-α.

    Astrodon H-α filters have a center bandwidth of 656.3 nm

     

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