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Filters
G'day David
The use of filters will certainly help to increase the contrast between nebulae and the background sky. This is more evident if you are observing from light polluted suburban areas or in moonlite skies. If you are trying to observe nebulae without a filter from light polluted skies , all but the brightest knots will be washed out, the sollutions are to move to dark skies or wait till there isn't a bright phase of the moon, not always practicable or, to start with, invest in a broadband nebula filter, which will be more versatile than a narrowband filter such as an Oiii .
Can thoroughly recommend using a broadband filter for most nebs like M42, M8, M17, NGC 3372 The Carina Neb, etc etc. See if you can borrow one to try out and compare the difference in the views with and without the filter. Hope this helps.
Jeff
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