Canon 300mm F4 odd ERR 01

Started 2 months ago | Questions thread
neilt3 Senior Member • Posts: 2,221
Re: Canon 300mm F4 odd ERR 01

Try cleaning the contacts on the lens with a bit of alcohol ( isopropyl alcohol , not beer ! )

If it looks good as new , lack of use could have allowed the surface to tarnish / oxidise .

It's odd though that it works well with the extenders and on you R5 via an adapter .

It seems to me the reason it looks new is because the previous owner also had this problem using it on his camera , so sold it as "as new " and just kept the fact it's a bit iffy quite !

It's possible there's an issue with the lenses chip and it needs replacing at a service centre , as it sounds like it's not communicating proper except when the information is passing threw something that modifies the information .

Though it's still odd that the adapter and extender can understand the lens .

Can you try the lens on any other bodies , either in a shop or friends ?

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