Quote:
Originally Posted by Starkler
The reduced weight [of a 1.6" thick mirror] does however necessitate taller rocker and mirror boxes to accommodate higher mounting of the altitude bearings to achieve balance.
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That applies only if you are dropping a thinner mirror into a scope allready designed for heavier , thicker mirrors. The best solution to balnce in using a thinner than 2" mirror is to make the top-end a fraction lighter without compromising stiffness. You can also just add a little weight to the mirror cell though I am not in favor off adding mass to a telescope.
There is typically a 5:1 moment arm leverage on a modern Dob. You don't need to shave off much weight off the top end to make up the difference in balance between a 1.6" and 2" mirror.