Quote:
Originally Posted by Lee
Ha filter - lets through only a 13nm band of light centred on ... 656.3nm (red light)
UV/IR filters block the non-visible light regions at either end of the visible spectrum (UV below around 380nm, IR above about 750nm)...
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You will no doubt get more good advice from others, but one thing to be aware of when trying to comprehend filters is that the term 'filter' can be a bit confusing.
Thus, in Lee's response above, the H-alpha 'filter'
lets through H-alpha, but a UV 'filter'
blocks UV. The context is usually clear, but if not it's best to use the terms 'blocking filter' (or 'absorption filter') and 'transmission filter'.