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Message: <blockquote data-quote="Paul Corfield" data-source="post: 1491439" data-attributes="member: 19132">Here's an example I took with my Skywatcher 80ED and Canon 450D. Distance to the boat was around 150m and the background is probably about 1 mile away. This is an extreme heat haze caused by a few degrees difference in temperature between the sea and the air above it. You are trying to photograph much over much bigger distances so there will bound to be some atmospheric disturbances, no matter how small. When I'm taking photos of birds even at 40m the detail will be robbed with air temperatures of just 15°c. In the winter when the air is cold and stable the details at the same distance will be crystal clear. The tiniest of disturbance in the air will distort details.Your camera has mirror lock up and it has Live View, as you found out by pressing 'SET', read the manual as you can magnify the image on the screen too. Live View also locks the mirror up so either of those would be worth a try and use a cable release as well to trigger the shutter when everything is perfectly still.Paul.</blockquote>