Both Sigma lenses are optical stabilized (OS) and has Sigma's hyper sonic motor (HSM) for fast AF. According to Sigma, the OS gives advantage of 4 stops over non stabilized lenses. The 18-55mm has a large aperture in its wide angle and overall it was proved to deliver excellent results and it's a very popular lens for beginners and advanced photographers alike.
So overall, you get a somewhat fast optical stabilized normal-zoom lens and an optical stabilized telephoto-zoom lens. It looks like a good starter KIT for anyone who want to get started with a Sigma camera. It's worth mentioning that you must use the exclusive SA mount lenses with SDxx cameras. Some people might decide to buy an adapter an use other third party lenses that they already own. But the thing is that when you go with Sigma, you probably want to use it all the way, without massing up with adapters.
If you just want to get the SD15 body only, without the lenses, you can purchase it via Amazon here
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