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Thanks wavelandscott, gmbfilter and Rob for your valuable input.
Wavelandscott, I need to say I have no problem with the focuser and eyepiece. Nagler9 T1 has a dual size skirt. When I throw it into the 2" focuser , it does not have enough travel out to reach focus, so I can only use the ep 1.25" skirt with the focuser 1.25" adapter. This makes the ep 30mm more extended from the focuser to enable focusing in my eye. With this arrangement I have more than enough travel in and out of the best focus. You should be right, I should be able to make 200x with 16". May be the atmospheric turbulence is the cause . Thanks to gmbfilter's recommendation I visited the webpage and think that airy disc shouldn't be discernable at that magnification. I would take Rob's advise to compare again the star images between eyepieces, and I will also throw in the barlow this time. Comparing what I see with that of other scopes is also a good idea.
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