Tom Reichner wrote in post #18790159
Whoever told you that is full of it. .
The differences between the v2 and v3 tele-extenders are only realized with the v2 and v3 lenses.
There have been a ton of online sources that have all said this from the very start of the v3 extenders. .
Whoever told you otherwise doesn't know what they are talking about and shouldn't be listened to or paid any attention to. .
I hate it when unknowledgeable buffoons lead others astray..
Yeah, I have the same lens as you.
I have shot my 400 f2.8 IS version 1 with both the 2xv2 and the 2xv3. .
No difference at all. I only bought the v3 because it was a really good deal and I could resell it for a profit..
Tom please correct me if I have read your post wrong, but are you saying that there is no difference (AF/IQ) between the Mk2 and Mk3 Canon 2 x extenders on Mk1 lenses?
The reason I ask is that this markedly goes against my (and a couple of others) experiences. Note none of the lenses (300 F2.8 L IS, 300 F4 L IS, 600 F4 L IS, 500 F4 L IS, 800 F5.6 L IS - manual focus, 400 F2.8 L IS etc etc) were Mk2 variants and none of the cameras (according to Canon) were capable of benefiting from the enhanced AF performance of the 2 x Mk3 extender. Yet, in all cases, the Mk2 extenders were sold ASAP due to the IQ and (slight but significant) AF improvements of the Mk3.
Naturally on the latest cameras and lenses the Mk3 extenders are even better - but even on the older stuff the 2 x Mk3 extender is MUCH better than the Mk2 in my, and a few others, experience.
With the 1.4 it is somewhat different as the Mk2 is better in the centre of the image, though with new gear, the Mk3 is better overall,
Life is for living, cameras are to capture it (one day I will learn how!).