سلام
رویوی این لنز در SLRgear :
کد:
http://www.slrgear.com/reviews/showproduct.php/product/215/cat/31
Alternatives
Sigma 120-400mm ƒ/4.5-5.6 DG OS ~$800 ....
Canon EF 100-400mm ƒ/4.5-5.6L IS USM ~$1,500 .....
Nikon 80-400mm ƒ/4.5-5.6D ED AF VR Nikkor ~$1,600 .....
Olympus 50-200mm ƒ/2.8-3.5 Zuiko Digital ~$1,000 ......
Sony 70-400mm ƒ/4-5.6G SAL-70400G ~$1,600 ....
Conclusion
While image sharpness never hits tack-sharp levels, there are some aperture and focal length combinations which show very good results. Chromatic aberration is generally well-controlled. Distortion is kept to a minimum, but light falloff is an issue when used on a full-frame camera. The 50-500mm ƒ/4-6.3 may not be the best lens we've tested, but it's certainly one of the most versatile - and Sigma is still the only manufacturer that produces a lens with this sort of range. If you find yourself needing that level of focal-length flexibility, perhaps this is the lens you've been waiting for.