Hi Dutch,
An example of performance between a UHC & OII filter, is probably well shown here in an observation report I did on the Orion Nebula, comparing magnification & filter usage. Different nebulas use different filters. Using the OIII oxygen filter on Orion certainly brought out bright Oxygen areas, however though, it took away much of the detail and contrast that the UHC provided. In general, as a whole, a UHC is the filter of choice for this neb.
http://www.iceinspace.com.au/forum/s...ad.php?t=67200
I've found the following link very helpful to me, and certainly cuts out a lot of the time trying on filters to get the best performance. It gives a comprehensive list of nebulas and which filter is best suited to each one.
http://pages.sbcglobal.net/raycash/filters.htm
And here is another link that I find particularly useful. It goes into detail on how all the different filters perform. I've had this link for ages, but after just re-reading it, I see I had previously missed the bit about using the OIII filter to split double stars that are bright!
Antares in particular (as it's difficult to split as it's so bright & large). It says the filter makes the two stars different colours making it easier to split the brighter star from it's counterpart. The brighter star turns red and the star turns blue. Interesting!
http://sciastro.net/members/portia.p...use-of-filterss
Have lots of fun with your filters, Dutch & enjoy!
Kind regards,
Suzy.
