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Old 15-01-2010, 02:35 PM
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southerncross (Jeff)
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Join Date: Dec 2009
Location: Cairns
Posts: 25
Losing the Glare

G'day all

I got my first decent view of Mars last night thanks to a break in the weather, it was nice and crisp in spite of street lights and neigbours garden lights etc. The big problem was that it was so bright I could see very little detail of the surface due to the brightness, would a neutral density filter fix this and if so at what percentage 50-25 etc?

Another question also is while doing the star test thingy ie put a star out of focus and check the Airy disc, while doing this last night I had very symmetrical rings around the star but I did notice that they were bent out of shape around the primary mirror clips, the circles sort of bent around the clips at these points, Is this normal?

thanks
Jeff
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