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Front Mounted Filter Design

Front Mounted Ha Filter Design

Front mounted Ha filters use many of the same components as rear mounted filters. An ERF comes first followed by an Etalon. The etalon is air spaced to provide thermal stability and have a central obstruction to maintain a precise separation. Light travels through the telescope and into the diagonal which houses the blocking filters.

An optional knurled knob on the Coronado filter housing allows you to tilt the filter. Tilting the filter changes the wavelength of the primary passband peak, allowing the filter to be "tuned" to nearby wavelengths to either do temperature compensation or to see strongly Doppler-shifted features. Tilting actually broadens the filter passband a bit, which can result in a reduction of contrast if carried too far.

A feature moving towards the observer will have its light shifted towards the blue end of the spectrum, while a feature moving away will have its light shifted deeper into the red part of the spectrum.

Why Ha? | The View | What you see | The Chromos | Ha Emission | Bandwidth | Main Designs | Ha Components | Rear Filters | The Etalon | Front Filters | Coronado filters | DayStar Filters | Solar Spectrum Filters

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 © Greg Piepol