I recently purchased a new canon EF 100-300mm f4.5/5.6 USM zoom lens which I found myself using a lot in my travels. In the images below and with many others taken, I was very disappointed in the sharpness of the images at high zoom, as they turned out looking somewhat soft. This shot is a condor in Peru at f5.6 at about 300mm zoom at between 1/1000th and 1/2000th shutter speed. Because of the high contrast between the dark condor and the blue skies at times, I experimented with several exposure metering controls, trying spot metering, evaluative, partial, and center-weighted. Over 400 photos were taken, and none exhibited a crisp, sharp image, and these two are the absolute best from those. My question is, is there another adjustment I should have used or perhaps is there a trick to bird photography, or is it the limit of the lenses affecting the image? The condors were often hovering, so I figured movement at this shutter speed shouldn't be a huge concern. Also, focus mode was set to All Focus AF. How can I improve my telephoto photography?