I've had a Bushnell 115mm (4.5 inch) reflector scope with a f/ratio of 4.5 for about a month now. And for some reason, I can't see planets at all well.
I tried looking at Jupiter last night with my 20mm, 12mm and 4mm eyepieces, and all I got was a bright fuzzy blob, and I couldn't see any moons. With Saturn I can barely glimpse what might be the ring, but I can't see any more with a smaller eyepiece. Nebulae and star clusters look pretty good though.
So what do you think is the problem? Is it simply because the f/ratio is too short for viewing planets, or a defect with the scope?

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