Just a reflection re teleconverters:

Image quality suffers, but in my experience, if one enlarge a photo from a given distant subject not using a TC to the same size of one taken with a TC, the final quality is better with the TC.
And TC's shall not be used with short lenses. They fare better making tele lens longer.
This is valid for 2X TCs - 3x TCs give lousy results...

This said, TCs shall only be used if a longer lens is not available.

Jorge O