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Old 22-11-2013, 01:01 PM
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alpal is offline
Join Date: Jan 2012
Location: Melbourne
Posts: 2,968
Have a look at this link:

The graph shows 5 different optical systems.
The 5th row down of the optical results is for:

5) Shape of the spot 10mm off-axis, in the plane shifted to compensate for field curvature.
Field curvature is defined according to the minimal RMS spot radius.
You can clearly see that the spot size for a Newt. is much greater than an RC.
(The SCT is shocking.)
I wish I could find a higher resolution image of this graph of optical results.
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