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Blocking filters are specified by their diameter....
In the Coronado range; BF5 = 5mm diameter, BF10 = 10mm diameter etc.
The Lunt use the same but a different system....B600 = 6mm diameter, B1200=12mm diameter.
A larger diameter Ha scope is always better!
The double stack only increases the Ha resolution by reducing the bandwidth from 0.7A to 0.4A....this effectively allows more Ha detail to be seen/ recorded.
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