Thank you for all your input.
cjc2 wrote:
For any tele-extender/lens/camera combination it is wise to check compatibility before purchase. In some cases, only an OEM device will work properly, in others several will be ok. Even within a brand, not all extenders will work with all lenses. The comment that these devices are really intended for fixed focal length lenses should be considered. Best of luck. Happy New Year!