Reviews written by Ophiuchus

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Ophiuchus
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Reviews of cameras, lenses, tripods, heads and other accessories written by Ophiuchus

The following opinions have been automatically translated with Microsoft Translator.

Sigma 50-500mm f/4-6.3 EX DG HSM

Pros: It covers the 24x36 mm well; once the fire has been calibrated, a good definition even at full aperture, especially at short focal lengths; compared to other objectives, relatively fast and quiet autofocus.

Cons: The zoom ring moves itself with the lens very inclined: the seller advised me to insert a rubber band near the ring; the back focus or the front focus differ greatly depending on the camera body, and to a lesser extent depending on the distance of the subject: for each machine I had to adopt a compromise value on the various distances.

Opinion: I bought this lens used, with Pentax attack, to be used on the K-1 or on the K-5 II s; for now I'm quite satisfied. It is possible to use freehand, provided that the stabilizer is activated on the body of the machine. The maximum effective brightness decreases rapidly as the focal length increases and 500 mm is not 6.3 but 6.7. It is inconvenient that the minimum focusing distance varies greatly depending on the focal length: from 1 meter to 50 mm to 3 meters to 500 mm.rnMy specimen is not DG HSM but APO DG, ie the autofocus is " cacciavitoso "; at least, however, the objective is apochromatic, to guarantee good quality.

sent on December 17, 2017