| Usually when you push some lenses past a certain point they do begin to loose sharpness and contrast. My old 75-300 was pretty much unusable after 200mm but below that it was fine. You can always try a wider shot cropped in, I've had to do that for most of my Silverstone shots as I didnt have enough reach with the 70-200 2.8.
Just read that your using a prosumer camera, but still bear the above in mind, lol !
Is your digital zoom or Optical zoom ? I'd imagine its probably optical up to a certain point then the digital zoom kicks in. Try and keep your camer out of the digital zoom as its only zooming in on the available pixels on screen. My Old fuji would optically zom to a certain point then you could hear it digitally zooming instead and the quality was atrocious from digital zoom. |