You lose two stops with a 2x converter so F5.6 will be your maximum.
Why is this the case? Won't it will focus as long as it has enough light to do so?
(I'm not arguing against your suggestion, just wondering why).
Steve.
Of course there is also the trick of taping the pins
Its a very good combo, I recently swapped my 150 -500 for the 120-300 with TC, so far I've been very impressed.I just tried a 2x out on my newly acquired sigma 120-300 f2.8 and it seems to work fine.
I just tried a 2x out on my newly acquired sigma 120-300 f2.8 and it seems to work fine.
I am afraid you memory has not served you well ! A f2.8 lens + 2x tc (e.g. f5.6) will AF on any focus point (lens reliant) or zone with any Canon DSLR - you have full access to all the AF options , it is only when the max aperture exceeds f5.6 that you have restrictions with certain Cameras. You can of course stop the lens down to any aperture and get full AF as the Camera only closes down to your chosen aperture after obtaining AF.You lose two stops with a 2x converter so F5.6 will be your maximum. From memory only the centre focus point worked on my 7D at F5.6. At any other aperture you will need to manual focus.
Its a very good combo, I recently swapped my 150 -500 for the 120-300 with TC, so far I've been very impressed.
I am afraid you memory has not served you well ! A f2.8 lens + 2x tc (e.g. f5.6) will AF on any focus point (lens reliant) or zone with any Canon DSLR - you have full access to all the AF options , it is only when the max aperture exceeds f5.6 that you have restrictions with certain Cameras.
I got the new Sigma Converters. So far working very well. If you look on my Flickr in the Thundersport GB album, most were taken using the 2x.What TC are you using? The Canon or Sigma one?
I have been looking at the 150-600 Sigma sport but am wondering if the 120-300 with 2 x would be a better option although more expensive
Why is this the case? Won't it will focus as long as it has enough light to do so?
(I'm not arguing against your suggestion, just wondering why).
Steve.