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Simmo, if you know the focal ratio (fr) then you will want one eyepiece with a focal length in mm of fr for sure. The shortest useful eyepiece will be about 0.75 x fr or perhaps 0.6 x fr, in mm. If you try ones even less than this, yes the image will be bigger but dimmer, and less sharp, so you won't see more detail.
For example, with say a 6" f/5 reflector, you'll want one about 5mm and another perhaps at 3.5mm. Of if you have a 6" f/15 maksutov, 15 mm and 10mm.
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