Summary: I purchased the Nikon version from adorama and used it for some outdoor as well as indoor shoots on Nikon F65. It definitely focuses faster and works better than a nikon G in low light conditions.
Pros: wide angle at 24mm is really useful for landscapes and corner sharpness is fine. Focuses fast on a Nikon. build quality is better than a Nikon G and similar to a Nikon D, except the rear. Comes with a hood useful for shielding against flare.
Cons: short zoom range, but it's good price! the hood will hinder mounted flash if subject is too close. Use flash connector or remove hood for such shooting.
Summary: Un prodotto piuttosto scadente, anche se bisogna tenere in considerazione il prezzo tutt'altro che elevato. Fisicamente, il prodotto è costruito con una plastica piuttosto economica, ma con attacco in metallo. E' anche presente il paraluce.
Pros: Prezzo, Peso, Paraluce, Messa a fuoco interna, La parte anteriore non ruota
Cons: Costruzione economica, Distorsioni, Nitidezza, Contrasto, Rumorosità, Diaframma a 8 lame, Difficoltà a focheggiare con poca luce, Lento, Inusabile a 24mm e/o a F3.5, Svalutazione dell'usato
Summary: I bougth this lens along with the SD9 camera and thougt this might be an ok performer. Either my unit was not so good or this lens is not so good. Compared it with the Sigma 28-80mm HF F3,5-5,6 and the 28-80 which is less expensive was alot better with better contrast and more sharpness.
Pros: Cheap, build ok
Cons: Sharpness and contrast should be better compared to the cheaper 28-80 F3,5-5,6 HF.
Summary: An exceptional lens, recommended to anyone who's contemplated buying the equivalent Nikon. This Sigma is wider (24mm) and produces better results throughout the zoom range. At 24 and 50 it beat the Nikons easily, the latter catching up only at 70mm. Corners are sharp and clear across zoom range.
Pros: * cheap, * HF (hellical focus, front does not move during focusing), * smooth zoom, * rugged, * metallic mount
Cons: The only possible weakness is of course the speed, f 3.5. However, I haven't seen a faster lens for the same price.
Excerpt: Ein Weitwinkel- oder Superweitwinkel-Objektiv für die SLR. Ich besitze dieses 24-70 UC Aspherical für eine Minolta Dynax 505si. Obwohl das Objektiv nur eine im 4mm kürzere Brennweite als ein 28-x hat, bekommen Sie rund 10% mehr auf das Bild (sagt Sigma).