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Main Designs of Hydrogen Alpha Filters

CoronadoSolar Spectrum 

Filters are mounted on telescopes in two main ways. Either behind the telescope's focuser like the Solar Spectrum filter on the left or like the front mounted Coronado 60mm filter at right.

Which way is the best? Like everything, it depends on your personal choice. Front mounted filters are easy to use, don't require electricity to heat and are easy to adapt to a variety of telescopes but, don't usually offer super-narrow bandwidths. Some like to stack two filters together to drop the bandwidth down to around .3Å.

Some rear mounted filters offer extreme solar detail (down to .2Å) and high magnification, but can be tricky to install (i.e. fitting extra hardware). While most require electricity to operate an oven at a high but well-regulated temperature, some (like the DayStar T-Scanner) do not. The amount of detail and contrast depends on the bandwidth of the filter and not necessarily where it is installed.

Which one to buy?

The best way to find out which filter is best for you is to determine how much you have to spend, narrow the field down to the best choices and go out and look through them. Star parties, astronomy conventions and many clubs have Ha filters on display at their events.

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