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Corondo - SolarMax II SME-90 double stack filter


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Manufactured by: Coronado



Coronado SolarMax II 90mm H-Alpha Etalon/ RichView Tuner Package

The Coronado SolarMax II 90mm Etalon/ RichView Tuner consists of a H-Alpha 90mm narrowband unit for use in doublestacking along with a matching RichView Tuner. Cannot be used without secondary interference filter. Coronado SolarMax II 90mm Etalon/ RichView TunerBy applying the Coronado SolarMax II 90mm Etalon/ RichView Tuner to your current SolarMax 90 system, you can achieve a <0.5 Ångstrom passband, centered on the 6562.8 Ångstrom H-Alpha line and the sub-Ångstrom passband width which gives a perfect balance of prominence and surface features. The assembly is thermally stable at 0.005Å per degree Centigrade, so there is no drifting off the H-Alpha line as the filter heats up during normal observing.

Product Series

Like the smaller 60mm filter the SolarMax 90 can be used on almost any telescope design under 3000mm focal length. However, the larger 90mm aperture increases resolution and allows for the user to view individual sections of solar activity at high magnification and when viewing at full disk the user gets the impression of curvature on the surface. The extra resolution will provide some stunning views; you haven't seen the sun until you have looked 'down' through a filament onto an active region. The SolarMax 90 provides consistent and breathtaking H-Alpha views.

All SolarMax series filters are sold in sets. The front mounted SolarMax and rear blocking filter. Almost all telescopes will require an adaptor plate in order to attach the SolarMax, these are available from Coronado or through your dealer. The SolarMax includes a T-Max de-tuning filter. Some events on the Sun,- notably active flares and coronal mass ejections (CME), are extremely fast moving. If such features occur on the disc of the Sun, their high velocity towards the observer results in their wavelength being Doppler shifted shorter than Ha. If the velocity is high enough, this wavelength could be outside the passband of the filter and the feature would not be observable. The T-Max allows the user to de-tune the SolarMax slightly to bring such phenomena into better visibility. SolarMax 90 can also be paired with a second SolarMax 90, second T-Max and an interface adaptor. This will reduce the bandwidth of the 90mm filter system to <0.5A and will greatly increase the contrast of the image. This addition is priced at $4,625.00. Be aware this creates a very top heavy set up and we recommend the use of a Coronado internal module to narrow the bandwidth instead of double stacking two 90mm filters. We recommend this configuration with the Coronado MaxScope due to the optimal design of this telescope allowing effective use of a double filter system. We make the internal module for a range of popular telescopes and will provide that information on request. Installing a module is not a permanent alteration to your host telescope. Not all SolarMax filters will match in this configuration and it is recommended that you send your filter to Coronado to have this work done. Coronado will not guarantee the performance, safety, or honor the warranty of any telescope being used with a non-Coronado adaptor plate Product Specifications Aperture: 90mm F/L: N/A F/Ratio: N/A Bandwidth: <0.7Å - <0.5Å Thermal Stability: 0.005 Å/C Blocking: Full blocking >105 from EUV to far IR

Additional Information

Name Corondo - SolarMax II SME-90 double stack filter
Manufacturer Coronado
Model SME-90
Manufacturer Part No SME-90