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in the middle of sydney, I can't see lagoon at all with an 8". A UHC makes it visible.
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If you live in the middle of Sydney and want to pursue astronomy, IMO you would be better specialising in an area where the targets aren;t affected by light pollution. eg Double Stars, Variable stars, Moon, Planets, Solar. DSO observation is not suited to suburbia. No matter how good a set of filters you have there is no substitute for dark skies. Looking at M8 from Sydney through a UHC filter might reveal the target but you won't get 1/10th the detail you will get under dark skies. It's a bit like observing Britney Speers with her clothes on, you can see her but you can't see the bits that matter
CS-John B