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When the scope gets bigger then filters like UHC and OIII work much better. So with, say, a 16" scope you will be able to view many more emission nebulae than with a smaller scope. The OIII is especially good at blocking light pollution from my suburban skies with larger scopes, but it blocks too much light with apertures 8 inches and smaller to be really useful. Only works on certain objects too.
You will also get more resolution on planets etc. but only if seeing permits.
Images are also brighter so compensate somewhat for eyes that may be not as dark adapted as in country skies.
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