Re: ATM X-Mailer: Juno Webmail Version 1.0

["Bob May" <bobmay@nethere.com>]

I don't know what really can be considered professionally as an aplanet but
I would suspect that a optical system where the focal plane is flat enough
to keep the aberration within the Airy Disc would be considered good enough.
When you are discussing focal plane curvatures of miles, the Sag. of the
curve of that focal plane is on the order of extremely small!   My
calculator just refused to give a value of the sag for a 1" radius spot for
a 1 mile ROC curve.  It just said 0.
Bob May
http://nav.to/bobmay
bobmay@nethere.com
NEW! http://bobmay.astronomy.net