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Not sure about the Canon 300D, but i use it all the time with the 5D and 30D, it is a great tool for centering and object and focusing on it.
When i use my 300mm F/2.8 i use this center square, guide the mount to the center, auto focus, then switch the lens to manual, presto perfect focus every time.
As the temp changes by one degree i refocus using the same method.
Leon
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