[andy153]

Hi Vernon, I have never tried it and probably never would. To start with the introduction of a teleconverter means slowing down the lens you are using ie the largest aperture is effectively cut down - so an f3.5 becomes f5.6, add another and you are making it effectively f11 so you will need very bright conditions to take a good photograph with a reasonable shutter speed. Also you are adding at least two extra layers of glass between your lens and the camera so you will probably loose sharpness or the image will be degraded in some other way. There are effectively two further opportunities for imperfect glass to affect the image. If possible I would invest in a longer lens rather than buy two converters. I notice Roys post and agree that there are some converters you just cannot do this with due to their construction.