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Orion Telescopes
Coronado SolarMax II 40mm Double Stacking Etalon Filter
3 easy payments of $266.66
With payment plan
Accepted Payment
Expected Ship Date: 08/13/2024

  • Give your PST a major contrast boost with this thread on filter
  • Designed to attach to an existing etalon, creating a double-stack system with a narrower bandpass
  • Includes RichView tuning to optimize contrast on the solar feature being observed
  • Threads directly onto the front cell of a PST, narrowing the bandpass to <0.5 Angstroms ()!
  • Not to be used standalone, MUST be combined with an existing PST or SolarMax 40 and blocking filter (BF)

Learn more
Item #  55729
Mfg Model #  SME-40

This add on etalon filter reduces the normal bandwidth of a PST, SolarMax 40 telescope, or filter set (etalon and Blocking Filter combination) from the single stack 0.7-1 Angstrom () performance to a more restrictive 0.5 , increasing visibility of surface detail and active regions on the Solar disc. Note that this etalon cannot be used on its own — it MUST be combined with a primary SolarMax 40 filter and blocking filter, complete Coronado SolarMax 40 telescope, or a PST telescope.

Solar Disk Detail Image

The Sun in hydrogen-alpha light showing some of the different features visible around the solar disk.

Includes the patented RichView tuning assembly, which allows direct tuning of the primary filter etalon. This provides an optimized contrast boost for the best possible views of active regions, filaments and surface detail, or quickly and easily re-tune for prominences on the solar limb. Upgrade your PST or SolarMax 40 to a double stack configuration for an even more amazing view of our closest star!


Limited Warranty against defects in materials or workmanship for five years from date of purchase. This warranty is provided by Meade for the benefit of the original retail purchaser only. For complete warranty details contact Meade at 800-626-3233.


Please note this product was not designed or intended by the manufacturer for use by a child 12 years of age or younger.

  • User level
  • Additional included accessories
  • Other features
  • Warranty
    Five year
  • T-max Tuner
  • Safe Solar Viewing Requirements
    Must be used with a blocking filter

Orders received by 1pm Eastern Standard Time for in-stock items ship the same business day. Order received after noon will ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.


This product is available to ship Standard delivery US except for delivery to Alaska and Hawaii. Delivery is available to APO/DPO/FPO addresses. Delivery is not available to US territories/protectorates. Delivery is available to Canada.

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