adding Ideal Filter

[theskyhound]

Hi Owen,

You make good points. I think of incorporating narrow band emission as being more about identifying the objects that will respond to a narrow band filter, and being able to separate out the H-Beta objects from the OIII, and maybe in some cases to suggest the UHC as being marginally better. But I think it will always be a matter of taste when it comes to the UHC vs OIII. It should be interesting to find out!