Canon 300mm F4 odd ERR 01

Started 3 months ago | Questions thread
OP JohnGillity New Member • Posts: 9
Re: Canon 300mm F4 odd ERR 01

Many thanks for the reply.

The lens in question was supplied by a major retailer in the UK and it appears that is was an ex-display model.

With further trial and error it seemed as though the error showed up after the iris/diaphragm had been increased to its maximum ie F4 at which it worked on any both cameras with or without extender.

However if  changed to a higher F number most of the time we had ERR 01. Having spoken to a repair company here in the UK they suggested it could be a 'chip' issue or a sticking diaphragm.

Either way the lens was defective and has been returned to the supplier. My guess is the lens had not been checked before dispatch. I had to return a previous lens which was advertised ( same retailer) as an IS version when it was lacking IS, not damaged just totally missing!

Alternative lens now sourced elsewhere which works just fine , not even needing a micro-adjustment on the &D MK ll.

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