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Message: <blockquote data-quote="Paganman2" data-source="post: 428450" data-attributes="member: 37668">There are these two chimneys with metal funnels about 100 feet away from me, they are about 3 feet apart and at a 45 deg angle between me and them, i have focused on the front one at f5.6 and 250 - 300mm and find i can see a subtle difference in focus between the front one(In focus) and the back one(slightly off)   so i assume the adjustment is ok?I have done the same with  a row of  five batteries about 20 feet away and again at 45deg, when i focus on the center batt again at f5.6 with 250 - 300mm after adjusting mine to +3  i am seeing the center batt sharp, and gradual out of focus behind  with a more pronounced out of focus in front,  so again i guess this is ok?P.</blockquote>