I’m not sure if here is the correct place to post this question, so please forgive me if it isn’t.
I’ve just purchased the above lens (Canon ef fit). When I open a photo in Photolab (ether version 4 or 5) I am given the choice of lens profiles - Sigma 150-600mm F5-F6.3 DG OS HSM C with either ef 1.4x II or ef 1.4x III.
I’ve seen that there are Canon 1.4 extenders version II and III and so I am assuming that Photolab is offering me a profile for my Sigma lens with a choice of Canon extenders.
If that is so, am I better off using the mark II or III and will DXO be bringing out a profile for the Sigma lens and the Sigma extender.
Of course, I may have misinterpreted the evidence. But any advice given would be gratefully received.