Canon 300mm F4 odd ERR 01

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JohnGillity New Member • Posts: 9
Canon 300mm F4 odd ERR 01

I have just acquired an 'as new' Canon 300mm F4 lens. It works fine with an R6 plus adapter and with or without a Canon 1.4 extender With a 7D II it works fine with a 1.4 extender.

BUT if I mount it directly onto the 7D MK ii I get the dreaded ERR01. The 7D MK ii works fine with other lenses with or without extenders including Sigma extenders on a Sigma 300mm F2.

Fortunately I bought the 300mm F4 to use with an extender so for the moment it is annoying but not catastrophic.

The pins in the camera mount seem OK and travel freely in and out and the contacts on the 300mm are unworn. Any suggestions/ thoughts out there would be most welcome?

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Sigma 2x EX DG Tele Converter
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Canon EOS 7D Canon EOS 7D Mark II Canon EOS R6
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