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Hi Gary - a 10" f/5 should be perfect with a 5x powermate! Gets you to about the same brightness and magnification as me with my 10" f/6 newt + 4x powermate.
The image shouldn't be dim @ f/25 so you must have had some nasty morning fog or dew! I've got a portable hairdryer that I use to remove dew when it strikes (almost every morning at some stage).
Now I understand the low contrast in your image - not enough brightness in the raw frames. Even so, it's quite a nice image!
regards, Bird
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