Extenders ... using extender EF 1.4x II or EF ... EF 1.4x II Extender Errors may occur if ... With Extender EF 1.4x II attached to the lens, only manual focus is possible. ... With Extender EF 1.4 x II attached to the lens, only manual focus is possible. When shooting with EOS A2/A2E/5, use -0.5 step exposure compensation when using extender EF 1.4x II, and use -1 step exposure when using extender EF2x II.
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