Canon 1.4 Extender II? Or is it worth spending a bit extra for the Mk III? Thanks
@CanonUKandIE
@DaveHolmes279 Canon 300 f4. Just for @DoningtonParkUK @OfficialBSB at the weekend if the sun is out 


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@c1arescott@doningtonparkuk@officialbsb MkII should be okay then I use mine for both Motorsport and Aviation. -
@DaveHolmes279 Good to get people's opinions, thank you
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