ATM Alt Bearing Size

["Jon B. Cooper" <jbcooper@gte.net>]

Hi All,

On a Dob mount, what's a good way to determine the best altitude bearing 
diameter for a given aperture and f/#  (8" f/8 in my case)?

Jon

Jon Cooper              No man knows what price he pays
                        for substandard parts and slipshod service
Ventura CA              until fate adds the cost of tragedy to his bill.