If the lens is the older type with a macro switch which has 2 screws holding it on to the lens it will not work.If it a super 70-300 you can put the camer on AV set iris to F22 if you have a stopdown button see if the lens stops down it ok if noe it will need a rechip or a new interuper
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If the lens is the older type with a macro switch which has 2 screws holding it on to the lens it will not work.If it a super 70-300 you can put the camer on AV set iris to F22 if you have a stopdown button see if the lens stops down it ok if noe it will need a rechip or a new interuper