All good answers so far, and true.
When I was shooting with the K-x I usually set it to no digital filters, and the Custom Image section (press the Info button) to Bright. That won't affect fuzziness at all, but will get the colors and saturation pretty close to a good picture, and you can also customize any of the Custom Image settings to suit you.Same for the K30 I'm using now, settings are almost identical. For the unusual occasion I shoot a few landscapes, the settings already posted are my starting point...ISO100 or 200, f8 and whatever shutter speed I need for a good exposure. If I have enough light, I'll go to f11 any time possible, to get more sharp area and less bokeh. If not, f8 works well. With a 50mm lens, f4 or smaller should do ok, but I prefer more depth of field for landscapes, so I'l almost always try for at least f8, smaller if I can get it.
Fuzzy images can be from not focusing well, or on the wrong spot, camera motion, or changing the zoom range while shooting, if using a zoom lens. Follow the above advice, ISO 100 or 200, start at f8, make sure the shutter speed is faster than the focal length, and a lot of people recommend using a tripod for landscapes. So if the focal length is 50mm, you want the shutter speed above 1/50. The K-x will do well at 1/60, there is no 1/50. If possible, try for faster, 1/180 if you can get it will work great for a lens in the 50mm range, or the 18-55 kit lens on 55mm. When I was shootingt sunsets with mine, I only got below 1/180 in the last few minutes before dark, when the shutter speed had to come down. I always shoot in Manual mode, but I've been doing this with film for 30 years, so the learning curve wasn't very wide...I was shooting manual before digital cameras existed...
If you don't know it already, you might want to do a bit of searching around and learn a little about how the aperture, shutter speed and ISO all affect each other. A tripod or monopod might be helpful, I almost never used one, but many people swear by tripods for landscapes.
Read the manual, let us know what lens you're using, and if you can, post an example or three so we can see what's going on.
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