At 200x Mars would appear as wide as two full Moons, not 100. You've only
doubled the magnification.


"Mick" wrote in message
. ..
At present Mars should be over 1/2 degree at 100 X's, which is a full moon
disc. At 200 X's, Mars should appear
as the moon would at 100 X's. This just doesnt happen because the moon
takes up the whole field in the EP at 100X's

So there is some optical trick occuring that eludes me...