Rack Focus
rack focus is a nice effect but when I do it the image kind of shifts. Increases and decreases a bit like I'm using the zoom, which i'm not. I don't recall seeing this when I've seen similar shots on tv. am i doing something wrong? I'm using a Sony DSR 500 if that helps.
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When you focus, you move a lens in a lens assembly. Depending on the build of the lens assembly, zooming may or may not also happen at the same time.
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It's called lens breathing. Most lenses suffer from this to some extent. Really expensive lenses have measures to prevent this from happening.
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Most 2/3" zooms breath when adjusting focus. The Canon wide angle zooms don't breath to a noticeable extent. What can work with some shots is to use the macro for the rack focus, setting the focus ring for the distant object and pull using the macro - it's very much an eye focus job.
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Double check the back-focus adjustment on the lens.
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