Originally Posted by
Rosl Roessner
Hi Jim,
I use that Teleconverter very much, because I have not the money to buy a really big lens (but I hope, one day I will...) The picture of the kingfisher is not sharpened; I did only very little sharpening at the eye. I am quite satisfied with the quality, as far as there is enough light, of course.
The Mark III does not recognize it and you can choose any AF Point. I am not sure how much light you actually loose, I have to figure it out for you.
I also bought the 1.4 and 2.0 Extender from Canon, but the quality (with the 100-400 lens of course) with 2.0 Externder is much worse, and I did not like the problem with the limitation to the centered AF point, when I use the lens with converter. (When usig the 2.0, there is no AF working at all) I know, I can fix the Problem with a kind of tape, but I didn't do it right now, because I am alright with the 1.7 TC. I prefer the 1.7 to the 1.4 because the sharpnes is ok and I have more mm.... Problem is only that we have that bad light in Germanys winter....
The Converter is made by a company called "Soligor". I can help you, to get one, if you want. It has a nice, slim shape ( thinner than the 1.4 TC) and is not expensive.