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<blockquote data-quote="Old Sub Sailor" data-source="post: 835773" data-attributes="member: 62429">I had my Z 180-600mm lens on my Z8, tripod mounted to an Arca-Swiss D4 GP head. I was trying to shoot tankers that were about 9 miles away. It was a bright sunny day, shooting across Trinity Bay (Houston/Galveston Texas area) in the heat of the Texas Summer day.When I used the vertical gear (knob) to slowly move the focus point (single shot focus) up or down to a ship, the point would continue to move in that direction and past the ship after I stopped turning the knob. At 600mm it looked like it moved a tremendous bit past the ship, but I am sure it was a fraction of a mm at that focal length, distance and background.The Arca-Swiss folks believe that it is EVF delay, and sent me all sorts of explanations about what that is. I was turning the knob very slowly by the way, and the ships were at anchor so they were not moving.&nbsp; I did have the High FPS Viewfinder turned ON, however, I also had image stabilization on (while on the tripod) which I have been reading is not a good thing.&nbsp;&nbsp; I felt that I may not have had the axis locks tight enough, and the setup was creeping a minute fraction, but was also concerned about getting them too tight so I did not crank them down. The Arca-Swiss head can easily handle the weight of that lens and camera, but I think that is still a bit of weight after all.</blockquote>

[QUOTE="Old Sub Sailor, post: 835773, member: 62429"] I had my Z 180-600mm lens on my Z8, tripod mounted to an Arca-Swiss D4 GP head. I was trying to shoot tankers that were about 9 miles away. It was a bright sunny day, shooting across Trinity Bay (Houston/Galveston Texas area) in the heat of the Texas Summer day. When I used the vertical gear (knob) to slowly move the focus point (single shot focus) up or down to a ship, the point would continue to move in that direction and past the ship after I stopped turning the knob. At 600mm it looked like it moved a tremendous bit past the ship, but I am sure it was a fraction of a mm at that focal length, distance and background. The Arca-Swiss folks believe that it is EVF delay, and sent me all sorts of explanations about what that is. I was turning the knob very slowly by the way, and the ships were at anchor so they were not moving. I did have the High FPS Viewfinder turned ON, however, I also had image stabilization on (while on the tripod) which I have been reading is not a good thing. I felt that I may not have had the axis locks tight enough, and the setup was creeping a minute fraction, but was also concerned about getting them too tight so I did not crank them down. The Arca-Swiss head can easily handle the weight of that lens and camera, but I think that is still a bit of weight after all. [/QUOTE]

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