I bought a white 30mm lens with an 18-55 lens. As you would expect, the images are sharper with this lens than with the kit lens. This lens is very compact and fits in a holster style camera bag while the kit lens is attached to my NX300. This lens outperforms the 18-55mm when it comes to low light, thanks to its larger aperture. Over the past few months I've found myself using this lens instead of the 18-55mm simply because it's smaller and lighter.
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