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|Filter thread||Rear: 46 mm|
|Dimensions (dxl)||Approx. 4.8 x 13.8" (12.19 x 35.05 cm)|
|Weight||6.82 lb (3.09 kg)|
|Camera mount type||Canon EF|
|Focal length||500 mm|
|Minimum focus distance||13.12' (4.00 m)|
|Maximum reproduction ratio||1:7.7|
|Angle of view||5°|
|Format compatibility||35mm Film / Full-Frame Digital Sensor
So has Sigma been over-ambitious? Yes, a little. This would be a much better performer if it were a 50-400mm zoom, especially given that it is compatible with Sigma’s 1.4x and 2.0x tele-converters for when extra reach is needed.
A very versatile lens
Poor performance at 500mm
Overall this lens performs extremely well and produces some excellent shots. In the specialist areas where it would be used, such as Wildlife and sports, it proves easy to handle and, just as importantly, carry.
Good build and finish, Fast quiet autofocus, Very usable wide open, Manageable for its type, Close focus distance is good.
Lacks a little contrast, Hood a little short for the focal length.
I've testing this lens for a week now and I cannot find any faults with it. I use it on my Pentax K-3 for wildlife photography. The lens is tack sharp at f4.5 through f11. On Pentax equipment,the lens does not have Sigma's HSM technology but autofocuses using the older screw-drive technology.
Durable, Easy To Use, Reliable
OK, so it is not the Canon f4.L lens, but it is less than 1/2 the cost. I use this lens to shoot wildlife, mainly BIF. Tracking with this lens took a while to get use to because of its size and weight. Now that I have used it for a while I love it!
Consistent Output, Durable, Fast / accurate auto-focus, Nice Bokeh, Rugged, Strong Construction
Changed from my previous trusty Sigma 50-500, to the slightly heftier 500 EX DG IF APO. Even at these weights, there is a strengthening curve, where you can shoot with it for up to 15 seconds before starting to shake, to extending it to a minute.