Originally posted by davy5toes Here's hoping one of you kind people can help me out. I've just been getting myself a Pentax k-5 along with an 18-50mm and 50-200mm weather resistant lenses. Needless to say both lenses lack in sharpness for landscapes which I primarily shoot.
Actually, if you have the 18-50, not an 18-55, even the cheap version is pretty sharp especially when stopped down to f8 or so. The 18-55 had several versions, and really only the original version has sharpness concerns when stopped down.
The better lenses are sharper, or render with more interesting characteristics, but this benefit isn't stark. The differences show up more at wider apertures. Before running out to get new lenses, I'd post some shots here with the exif data intact. This will allow us to provide input and help determine what your next step might be.
For example if you are shooting without a tripod at higher ISO and nearly wide open aperture and/or slower shutter speeds, then your issue may be technique. If you don't have our don't use a hood, then contrast can get washed out. There are a lot of possible culprits.