a) I don't think those sample photos are so terrible.
b) Environmental effects. Wind might have been a problem. Feel free to use TAv mode in such situations. The other problems might be haze, condensation, humidity, and diffused light. Diffused light such as on overcast days makes things look softer
c) Did you use 2 sec timer with tripod? This avoids mirror slap and also the shake that happens when you press the shutter button. Using tripod and 2 sec timer will add a lot of sharpness to your photos, if your stance and button-pressing technique are less than perfect.
Originally posted by Markovo Shoot RAW and use sharpening... you'll see the difference.
This is a great tip, as well. If you shoot jpeg, you can increase the incamera sharpening and even change its type. If you shoot raw, you can use more advanced sharpening. And adjust things like contrast, clarity, which add to the
perception of sharpness.
Remember, sharpness is not just resolution. Other factors can play a big role. Telephoto shots on hazy days will not look as sharp as closeups on bright, sunny days.
Originally posted by BigMackCam I'm happy to be corrected on this, but I can't think of a lens fault that would allow a lens to be sharp in the foreground and background but not in between. It has to be wind and/or atmospheric, but - in my view - wind...
Originally posted by BigMackCam James - if there is blurriness generally on one side (or in one quadrant) of images from a particular lens, it can point to a de-centering issue
I agree with these points, as well. Decentering could be an issue, but I don't think these photos show it.
Sometimes something like a fingerprint smudge on the back lens element can cause odd blur. Or a filter mounted to the lens. Try inspecting the lens, check its aperture lever, check the back element