Gene51 wrote:
Save your money - your viewfinder will be too dark to focus manually, and at max zoom your camera will hunt and peck relentlessly for focus. If you care about image quality and want better results, get closer to your subjects. TCs are best used on fast telephoto primes and pro level zooms - usually F4 or F2.8. Results, at best will be only fair, and that will only be in excellent light and at an Fstop of F8 or F11.