John I have a Sirius optics nebulae 1 filter and it works pretty well on my little scope. I was told that this filter is good for planetaries as well as nebulas where as others are only good for nebulas. My scope is dark anyway so it doesn,t do this filter justice. I can still see the difference though. I think through a better scope you would be able to really tell the difference. Ibought it from melbourne for $125 1.25". But I think that Telescope and Astronomy in South Australia sell them cheaper. I got an IR Baader filter for $85 for my webcam. Their website is
www.telescope-astronomy.com.au
Regards Cristian