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<blockquote data-quote="nickt" data-source="post: 698161" data-attributes="member: 4923">I get the fog a lot in the summer going from the a/c to outdoors on some of those 90% humidity days. I never had a problem beyond waiting for the fog to clear. I would say with your 18-140, take a shot outdoors in great light at a good shutter speed, iso 100 and f8. Use single point focus. Also back the zoom down to about 100mm. Lenses in general can be less sharp at full zoom and wide open aperture. As far as focus tuning, just do a very preliminary test. Take a shot of a fence or the side of a building at a 45 degree angle. Use single point focus and your widest aperture. Even a shot of the ground is fine. Something should be in focus, either exactly at your focus point or just in front or behind. If its not sharpest at the focus point, then maybe you need to tune. In any case, something should be sharp proving your sensor is fine. It may not be as sharp as at f8 and 100mm though.</blockquote>

[QUOTE="nickt, post: 698161, member: 4923"] I get the fog a lot in the summer going from the a/c to outdoors on some of those 90% humidity days. I never had a problem beyond waiting for the fog to clear. I would say with your 18-140, take a shot outdoors in great light at a good shutter speed, iso 100 and f8. Use single point focus. Also back the zoom down to about 100mm. Lenses in general can be less sharp at full zoom and wide open aperture. As far as focus tuning, just do a very preliminary test. Take a shot of a fence or the side of a building at a 45 degree angle. Use single point focus and your widest aperture. Even a shot of the ground is fine. [I]Something[/I] should be in focus, either exactly at your focus point or just in front or behind. If its not sharpest at the focus point, then maybe you need to tune. In any case, [I]something[/I] should be sharp proving your sensor is fine. It may not be as sharp as at f8 and 100mm though. [/QUOTE]

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