Thanks for the compliments, Major. That article of the effects of diffraction is quite good. However, as the author notes:
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Even when a camera system is near or just past its diffraction limit, other factors such as focus accuracy, motion blur and imperfect lenses are likely to be more significant. Softening due to diffraction only becomes a limiting factor for total sharpness when using a sturdy tripod, mirror lock-up and a very high quality lens.
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Since I am using none of the last three, I guess I should concentrate more on getting the focus right. I am getting there slowly, with tips and help from all you guys here.
Regarding the shutter speed, it was slightly windy and I thought I would use a faster speed to negate the blur effect caused by the wind, especially since my lens does not have VR built into it. I already have shaky hands and putting the wind into the bargain will make life more difficult. I will try this exercise again with a slower speed, smaller aperture, lower ISO combination and post the result here.