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Astrodon 20 nm Filters – H-α 20nm (Close-Out)
$350.00 – $360.00H-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.
Astrodon 20 nm Filters – H-α 20nm (Close-Out)May 14, 2018 -
Astrodon ExoPlanet Light Curve Filters
$185.00 – $360.00Astrodon introduced the ExoPlanet-BB filter for use in amateur-scale telescopes to measure light curves of exoplanets.
Astrodon ExoPlanet Light Curve FiltersMarch 10, 2018 -
Astrodon H-β filter, 15nm bandpass (Close-Out)
$350.00 – $360.00This filter isolates only the hydrogen-beta line of the spectrum (486nm) in a 15nm wide bandpass.
Astrodon H-β filter, 15nm bandpass (Close-Out)May 14, 2018 -
Astrodon 52mm Screw-in Filter Cell
$20.00For placing Astrodon 50 mm diameter filters in 52 mm threaded mounts for camera lenses.
Astrodon 52mm Screw-in Filter CellFebruary 16, 2018 -
Astrodon Photometrics Sloan Filters
$212.00 – $550.00Standard sizes are 1.25″, 31mm, 50mm round, and 50mm square. The 1.25″ is 27.5 mm of filter glass mounted in a 1.25″ filter cell. The 31mm is 27.5mm of filter glass mounted in a 31mm ring. More information here:
Unlike other Astrodon filters, the Photometric filters (Johnson-Cousins and Sloan) do not come as 36mm of unmounted glass. For those who want 36mm round for use in a 36mm filter wheel, 27.5 mm of filter glass can be mounted in our 36mm adapter. More information on 36mm mount here:
We also have a limited quantity of 12mm and 25mm (call for pricing and availability). All Astrodon Photometric filters are 100%-Coated for long-term durability and consistency of research with the highest throughput.
NOTE: In Astrodon part numbers we pronounce the ‘ character (apostrophe) as “prime” and the _ character (underscore) we pronounce as “sub.” So u’2_27R should be read as “u prime 2 sub 27 R.”
Astrodon Photometrics Sloan FiltersMarch 10, 2018 -
Astrodon Close-Out Sloan Filters: discontinued, special order remnants, odd sizes, etc.
$75.00 – $1,000.00These 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.
Astrodon Close-Out Sloan Filters: discontinued, special order remnants, odd sizes, etc.April 25, 2019 -
Astrodon Photometrics Johnson-Cousins Filters
$216.00 – $550.00Filters in stock ship usually ship within 1 week. Filters on back-order usually ship within 3-6 weeks.
You may click the “Get an alert” button to be notified when an out of stock filter is back in stock. It is necessary to pay for back-ordered filters immediately to reserve your spot in our wait list. Often we have more orders for out of stock filters than we have incoming filters. Many Astrodon filters are perpetually out of stock for this reason.
Standard sizes are 1.25″, 31mm, 50mm round, and 50mm square. The 1.25″ is 27.5 mm of filter glass mounted in a 1.25″ filter cell. The 31mm is 27.5mm of filter glass mounted in a 31mm ring. More information here:
Unlike other Astrodon filters, the Photometric filters (Johnson-Cousins and Sloan) do not come as 36mm of unmounted glass. For those who want 36mm round for use in a 36mm filter wheel, 27.5 mm of filter glass can be mounted in our 36mm adapter. More information on 36mm mount here:
We also have a limited quantity of 12mm and 25mm (call for pricing and availability).
100%-Coated for long-term durability and consistency of research with the highest throughput.
Astrodon Photometrics Johnson-Cousins FiltersMarch 10, 2018 -
Astrodon Close-Out Johnson-Cousins Filters: discontinued, special order remnants, odd sizes, etc.
$200.00 – $1,250.00These 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.
Astrodon Close-Out Johnson-Cousins Filters: discontinued, special order remnants, odd sizes, etc.April 25, 2019 -
Astrodon Close-Out Stromgren Filters: discontinued, special order remnants, odd sizes, etc.
$500.00 – $1,000.00These 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.
Astrodon Close-Out Stromgren Filters: discontinued, special order remnants, odd sizes, etc.April 25, 2019 -
Astrodon Clear Filters
$173.00 – $499.00Filters in stock ship usually ship within 3 weeks.
You may click the “Get an alert” button to be notified when an out of stock filter is back in stock. It is necessary to pay for back-ordered filters immediately to reserve your spot in our wait list. Often we have more orders for out of stock filters than we have incoming filters. Many Astrodon filters are perpetually out of stock for this reason.
UV-Blocked Clear filters with 395 nm cut-on (50% transmission at 395 nm) and at least 97% transmission to 1000 nm. Often purchased with our photometric filters.
Astrodon Clear FiltersMarch 6, 2018 -
Astrodon UVenus UV Imaging Filter
$209.00 – $462.00Filters in stock ship usually ship within 3 weeks.
You may click the “Get an alert” button to be notified when an out of stock filter is back in stock. It is necessary to pay for back-ordered filters immediately to reserve your spot in our wait list. Often we have more orders for out of stock filters than we have incoming filters. Many Astrodon filters are perpetually out of stock for this reason.
ASTRODON UVENUS FILTER
- <0.01%T 285-305 nm; <0.1%T 420 – 1100 nm
- Image the cloud structure of Venus and Jupiter with CCD cameras on a telescope.
- Use for general UV photography (flowers, insects, forensics).
Astrodon UVenus UV Imaging FilterMarch 9, 2018
