Want to share few observations about this lens:
1. My copy is significantly sharper at f/6.3 compared to f/5.6. However, bokeh is much nicer at f/5.6. I wish it was slightly sharper at f/5.6 - in that case I would use the lens at f/5.6 90% of the time. f/7.1 is even sharper than f/6.3. But f/8 is not any more sharper than f/7.1. I\'ve stopped using this lens at f/8 except when I want to get more dof.
2. The lens has focus shift. It back focuses as you stop down from f/5.6. I actually use 3 different values of fine tuning depending on whether I am at f/5.6, f/6.3 or f/7.1.
Feb 25, 2016 at 05:04 PM
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