I've got the Sigma 120-300 (non-DG version) and I was wondering how well it works with the Sigma 1.4.
I noticed there are two type of 1.4 TCs, the EX and the EX DG. Any difference between the two?
The 1.4, wonderfully! Unlike the Nikon 2.0 and the 70-200VR the Sigma 2.0 also works splendidly. When you get out to 300 with the 2.0 it begins to get a tiny bit cloudy in the distance. The 120-300, 1.4 and 2.0 are keepers. Sadly I can't help you with the two 1.4 versions. If you Google it you should be able to find an explanation though. If it's a case of an improvement I would not try and save money on the older one. You've go all this way for a reach, why stop just short? I'd go for the optically better TC..if that is the discriminator.