Hi Mali
Welcome to WPF , I see you live just down the road from me in global terms.
A couple of points about teleconvertors.
1) They amplify lens imperfections so the best teleconvertors should only be used with the best lens. Primes lens will give better results than zooms. Fitting them to budget zooms is really a waste of time.
2) There maybe a physical fit problem. i.e glass bashing into glass with certain combinations of lens and convertor.
3) With a x1.4 you will lose 1 stop of light.
4) With a x2 you will lose 2 stops of light.
5) Many cameras lose Auto Focus function when the combined lens and teleconvertor is greater than f5.6.
6) The x1.4 option is favoured by most people as the image quality loss is acceptable and you will still retain Auto Focus with a 300mm f4 lens.
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