Jenny, had to check the cat food before going to sleep..and had one thought. These teleconverters simply change the focal length of the lens.  For instance, if shooting at  40 mm , with the 1.75 converter the view is like that of a 70mm lens, etc.  (40mm x 1.75).   Focal length determines the wider angle or closer view, i.e.  20mm for wide angle to perhaps 200mm for telephoto. Remember, 50mm is about normal view with the eye. Others who have used teleconverters might tune in and give some real life advice or you might want to start a thread to ask about that for more answers.

I suggest if you can possibly find a dealer with one in stock, slip it on the camera and take a look first. See what you are getting and snap a few shots.  Finding a stocking dealer will be the problem.   now, to zzzzzzzzzzland.        Tom.