The 18-270mm is what we call a superzoom lens- it can be used for everything, but it isn't optimal for any one type of photography. Your basic shooting technique is therefore really going to be the most important factor in overcoming the limitations of the lens. Ultimately, though, I would strongly recommend expanding your kit.
For portraiture you'd ideally want a standard or short telephoto lens with a fast aperture, such as the 50mm F1.8 (very affordable) or 55mm F1.4 (premium). If you want to use the 18-270mm, keep it in the 35mm to 70mm focal length range, be as close to your subject as possible, and shoot wide-open. The 18-270mm has fairly prominent distortion at its longer zoom settings, so these should be avoided when taking portraits.
For sports you'd want a telephoto lens with a wide aperture and fast focusing. Since the 18-270mm is only F6.3, it might be a bit slower to focus than you'd like. But essentially, use the longer focal length settings, enable in-camera lens corrections to get rid of vignetting, use AF-C, and fire away. Another great technique to keep in mind for sports is panning (for more details on technique, scroll down to the action photography heading
here).
Better tele alternatives to the 18-270mm include the Pentax 55-300mm F4-5.8 (affordable), 60-250mm F4 (premium), or Tamron 70-200mm F2.8 (premium / fastest).
Adam
PentaxForums.com Webmaster (
Site Usage Guide |
Site Help |
My Photography)
PentaxForums.com server and development costs are user-supported. You can help cover these costs by
donating or purchasing one of our
Pentax eBooks. Or, buy your photo gear from our affiliates,
Adorama,
B&H Photo,
KEH, or
Topaz Labs, and get
FREE Marketplace access - click here to see how! Trusted Pentax retailers: