I am looking for some opinion/recommendations concerning this lens. I own one and the vignetting at 18mm is pretty "bad" although it is easily corrected in post editing (Lightroom/Affinity). However, this lens consistently receives good ratings in a number of reviews. This is the information I am seeking: Anyone here have this lens? If so, will you please recommend the best settings/use of this lens? I have it mounted on a pristine Sony NEX-6. I will be making a trip to Colorado next month and want to insure I understand the best settings for this lens.