Originally posted by UncleVanya My suggestion is to try it again with the 1.7x closest to the body and see if the results are better. But before you do verify that the glass in the 1.7x won't contact the 1.4x - I did it and I think it works but then again I was a stupid person and mounted a DA 15 to the silly 1.4x once only without damage but found out later it was possible to damage one or both due to the way the glass protrudes.
It was a very short test, but, with the 1.7 first the lens wouldn't lock focus. I gave up pretty quickly and reversed the order and I was back in business.
It wasn't that it wouldn't lock focus totally, it was that it wouldn't lock focus consistently, I was was missing opportuities because when there was a 6-7 second pose, the camera would not lock focus.
Tested on the DA*200.