While away on holidays last week I found everything looking very blurry through the viewfinder one morning. Thought that something must have happened to the lens. Changed it out for another. Same result. Put up with it all day long dreading the thought of there being something horribly wrong with my gear. It is to my chagrin that it wasn't until the next day I pulled it out of the bag and in the process touched the adjustment wheel that allows adjusting the diopter setting. Enough said?