Quote:
Originally Posted by sjastro
The UHC will help but it is nowhere near as effective as an OIII filter.
Steven
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Hi Suzy,
With only 6" of aperture the UHC filter is a better choice than the OIII filter IMO. The OIII is a much harsher filter than the UHC and will provide an overall significantly dimmer view than the UHC filter. This applies even moreso if your skies are less than pristine, in terms of light pollution. In addition, the UHC is more flexible than the OIII and will work on a wider range of targets. True the OIII will improve "some" planetary nebula more than the UHC, but overall the UHC will provide a noticeable benefit over the OIII on more targets and a wider range of targets.
The planetary nebula that have been recommended to you are all ideal targets for a 6" telescope.
NGC 3918 (Blue Planetary)
NGC 3242 (Ghost of Jupiter)
NGC 3132 (Eight Burst)
These are all easily visible in a 6" scope from 1/2 decent skies without any filter. You just gotta point it in the right place and the finder charts provided to you will help enormously.
Cheers,
John B