Thread: Dobsonian 8"
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Old 12-04-2014, 09:23 PM
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Allan_L (Allan)
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Allan_L is offline
 
Join Date: Mar 2008
Location: Central Coast NSW
Posts: 3,339
Hi Eeda,
welcome back.
Before buying a moon filter, if your dust cover has a small removable cap, try viewing the moon with the dust cover on (with the small cap removed).

Make sure to position this away from the spider veins (that hold the secondary mirror).

This should cut down the light significantly, while still allowing good viewing.

Also works for Jupiter when it is bright.

If this is not sufficient, you can buy a moon filter, or a NULL filter (which just cuts down light transmission) or a polarising filter arrangement (which is two polarised filters, which you can turn in respect of each other to adjust the amount of light that gets through).

Other things to look at currently may include Eta Carina (nebula), Omega Centauri (Globular cluster), The Jewel Box (Open cluster with various coloured stars); Centaurus A (Galaxy - The Hamburger).

These are all deep Southern objects around the Southern Cross (Crux).
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