Hi Roy,
Thanks Roy.
I use a Kenko Teleplus 1.4x PRO300 DGX.
But at the longer end, when the minimum aperture gets above f8, AF is struggeling. Sometimes no AF.
AF with live view works quite okay.
Maybe I have to try the Sigma 1.4 extender, the 1401. Or maybe the older version...
By the way, I use a Nikon D750.
But first I have to give myself the time and opportunity getting to know this lens.
Ad B
With the Nikon version only the Sigma TC's work properly.
The kenko versions struggle to AF correctly (jumpy AF)
The modified Nikon version works but reports EXIF data incorrectly
The Sigma EX DG and the TC-1401 work well but are very similar in image quality so save some money and buy the DG (used a little over £100)
Just my 2p
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