Just got back from a great week at the Laurel Highlands Star Cruise.
We had 4 out of 6 good nights! I saw some messages about the reducing
the glare of Mars in order to see some of its features better and
thought I would provide the following information to see if it would
I was setup next to a gentleman named Tony Donnangelo. Tony has a 14
inch Dob. When we looked at Mars, he brought out an apodising
(anti-diffraction) screen. It really made a tremendous difference! You
could see a lot more of the features of the surface of Mars with the
screen. From what I've read, the screens are very easy to make. Bill
Cheng was also there and told me that you could find the formula for the
size of these screens in 'The Planet Observer's Handbook' (pg. 51 of my
The next night, Dallas ? (sorry don't remember the last night) brought
over his polarizing filter. With the polarizing filter and the
apodising screen you could see even more features on Mars. It really was
remarkable. I am going to make an apodising screen for my scope and
seriously think about buying a polarizing filter.