Ever since getting my new 70-300 lens, I have been waiting for a clear night to test it with a moon shot. Finally, I got the opportunity, and grabbed this one.
To make sure I got it as clear as possible, I exposed as bright as I could without blowing out any highlights, used mirror lockup, turned off the image stabilization, and used a cable release.
Post processing included playing a bit with brightness and contrast, turned down saturation, sharpening a good amount, and turning off almost all noise reduction (all in RAW).
Focal length here was the full 300mm
Edit: I updated the image with one that was less exposed, as suggested by bassbone. It shows even better what the lens can do :)
This looks much better than the EF-S 55-250 IS lens, see highly processed example here:
If you shorten that exposure more - 1/250 or so and fire it at about f8 - you might end up even sharper...
Remember that the moon is actually a big reflector of the sun, so it is going to be bright (as if in the daytime). Here is a recent take I did of the moon at much much faster shutter speed (the highs are not as blown out as seen in your attempt)
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