> If i can remember it right.. with the 1.4x it�s 1/2 of normal AF, and with
2x  it�s 1/4:th the speed...

So if we stack the two converters then the AF speed is 1/8th?     :-)
Regards,Ken

There's one in every crowd Ken. Regarding the original post from Christian
though - you might be right about the technical figures but the loss from
1.4x to 2x in reality seems much less linear than the figures would
indicate. If I was pushed to try and quantify it I would guess about a 10%
loss in AF speed with the 1.4x and about 30% with the 2x.
Regards, Tim


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