softness: me, glass, or camera?

Started Jan 17, 2014 | Discussions thread
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softness: me, glass, or camera?
Jan 17, 2014

I am getting lots of soft images from my D90 with Tamron 18-270 mm f/3.5-6.3 9the older model). Normally I shoot my kids but I do not want pics of them online, so attached are some landscapes, they illustrate my problem even better since there's no motion blur. These jpeg are OOC.

18 mm, f8 ,1/250, ISO 200

I find my lens often had problems with the autofocus, I just can't get the subject in focus as shown by the monkey:

130 mm, f6, 1/160, ISO 400

So, is this me (I mainly use shutter priority or automatic if shooting kids as full manual will make me miss the shot) or the glass? What suggestions can you offer?

Nikon D90
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