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DJDD
With Canon the EF lenses can be used on both size sensors, the EF-S ones can only be used on APS-C sized sensors, ie: all except 1D, 5D and 6D.
Other makes (eg Sigma, Tokina etc) use a code in their lense name to indicate if it is compatible with full frame or not, if you check their websites it will usually have that info.
Malcolm
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