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Frequent Contributor
Posts: 42
Registered: ‎06-17-2014

7D Mk II and 2x extenders

Initially just canvassing opinion/"putting it out there..."


So far I've been delighted with my 7D Mk II - it improves over my 7D and 70D in every area that matters to me.




Whereas those cameras both work perfectly well with my Sigma 120-300mm f/2.8 and 70-200mm f/2.8 lenses attached and a 2x TC (Sigma or Canon Mk II) between them, my 7D mk II over-exposes by almost two stops with the same lens/TC combos. 


Every time.


In any exposure mode.


1.4x TCs from Canon, Sigma and Kenko work perfectly with the 7D Mk II and the SIgma lenses; but with either 2x, exposure is all to hell.  


I can get round this easily enough by dialing in -1.75 EC, but it seems clear enough that this is something that needs to be addressed - presumably via a firmware update.


Anyone else?

Frequent Contributor
Posts: 50
Registered: ‎02-07-2013

Re: 7D Mk II and 2x extenders

[ Edited ]

Just tried my 70-200 2.8 mk2 and 2x extender (Canon) mk3 and no problem, exposure fine.




Oops, just seen you are using a Siggy 70-200, so my reply may not be totally relevant..

Frequent Contributor
Posts: 42
Registered: ‎06-17-2014

Re: 7D Mk II and 2x extenders

No, it's helpful, George - it points at the Sigmas as being the issue.

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