First attempt at lunar photography

Thanks to everyone who offered advice. Of the shots I took tonight,
this is the one that came out the best:

http://farm5.static.flickr.com/4021/...d587607a_o.jpg

To get more of the background info, see

http://www.flickr.com/photos/35853148@N05/4291914387/

One pixel in this image represents one pixel on the camera sensor.
I have a few questions about optical quality:

First, the resolution limit appears to be a few pixels wide; i.e.,
at the extreme limit of magnification, the optics are almost but not
quite up to the resolution of the sensor. Is that typical? It seems
to make more sense to me than having the sensor be the limiting factor.

Second, I had been warned that the teleconverter would magnify without
improving anything; indeed, that it would just degrade the image with
chromatic aberation, etc. Does the image I linked to above look over
magnified, or does it look like what you would expect for a scope near
its limit?


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