Thread: Introduction
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Old 26-09-2007, 01:58 PM
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erick (Eric)
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Join Date: Dec 2006
Location: Gerringong
Posts: 8,548
The screw-in green filter is a neutral density filter - designed to make really bright objects easier to look at. Used for the Moon. Can sometimes be useful for Jupiter. Does it have any writing on the side? Which of the other bits does it screw into? The barlow and the 4mm, 12.5mm and 40mm?

OK, that's my bit of advice done! For what it is worth!
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