ATM My scope design - diag. size sound okay?

["Jon Bertrand"<jonb@cirris.com>]

With a 9.95" f/6.85 primary and a 1.52" secondary I can get a 100% illumination
size of 0.34 degrees and a 75% size of 0.82 degrees.  

My main site is very light polluted and I'm now looking mostly at planets so I'm
thinking this is a good size of secondary.

Anybody have a scope like this.  Does this sound okay?

My longest eyepiece is a 25 mm/48 degree - that'll be about 69x with a true
field of 0.7 degrees.  If I understand things that means the light will roll off
to about 80% at the edge of field in this eyepiece.

Is this okay.

Thanks,

Jon Bertrand
jonb@cirris.com