Summary: Mount seems a little tight. The 18-55 fits much better. Not sure if the lens is re-furb, used, or new. Unsure what "white box" means. Came with no Canon literature or packaging. Lens works well and takes a clear bright pic. I guess the low price is why it came the way it did. All that's left is to go on a picture taking trip and test it against my Olympus E-PL1.
Excerpt: Dropped the thing down a flight of stair (whoops, butterfingers) and it still works perfectly fine. Takes clear, extremely sharp images, autofocus is adequately fast, and the out of focus elements are nice and smooth.
Pros: Consistent Output, Durable, Easily Interchangeable, Lightweight, Strong Construction
Summary: Did not come in the typical Canon packaging. It came in a plain white box and bubble wrap. No instructions nor warranty within the box. It looked pristine and I have not used it yet. I am wondering if this was a return? "Gray market" as they say. Update: I used the lens before and it seems to work well. I viewed the photos on my laptop, which does not have the best screen resolution. I forwarded the photos to my Workstation that has a very nice Samsung 22 inch monitor.
Excerpt: this has become my go to lens for this camera. it makes the system small enough to easily fit in a pocket, and with a relatively low f stop of 2 you get an overall nice boca compared to the 18-50 lens.
Summary: Bought this to add to the 15-55 zoom because at f2, it's fast glass. It's come in handy in very low light situations in which I often find myself. Also, it's diminutive size makes the EOS M a pocket camera... if you have fairly large pockets. Build quality is up to typical Canon standards and will continuously auto-focus, which comes in handy as I shoot almost exclusively in video mode.
Excerpt: For >%50 off of the release price of this lens, it is a very nice sharp and fast lens. Makes the EOS-M a little more portable. The autofocus step motor is a little noisy, so it may not be so great for videos. Wished the boken were a little sharper, overall a nice addition to my other 18-55 zoom lens.
Pros: Durable, Fast / accurate auto-focus, Lightweight
Excerpt: When folks complain of focus speed or hunting with this lens or the EOS-M system as a whole, realize that Canon's default focus mode is Continuous AF. Change this setting and focus will lock quickly.