The Sigma 30mm F1.4 EX DC HSM ($690 list) is the APS-C version of the classic fast 50mm lens that, before the popularity of zoom lenses, was the standard lens paired with 35mm SLRs.

Fast aperture; Available for many camera systems

Expensive; Soft images; Noticeable distortion

If you change lenses frequently (as I do) and happen to put this one back in your bag without first attaching the rear lens cap, the rear glass is very easy to scratch as the glass protrudes beyond the lens mount when lens is set to infinity.

Captures nice images

Fatal design flaw

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This is a very nice lens for the price. Heaps cheaper than a nikon comparable product, nice and sturdy and produces nice bokeh at open aperture.

I bought this lens with the intention of photography active toddlers and doing some night shots. It delivers that and more. Images are very pleasing and same with the bokeh. It's my favourite prime so far (tried Canon's 50mm f/1.4) and highly recommend it.

This is one of my favorite lenses!! I love how fast the lens is and how close you can get to things. The images are amazing!!

If you don't know what you're talking about, don't review products, especially if you claim to have a high level of tech knowledge. Earwigy's criticism that the "depth of field is pretty bad" is a ludicrous statement. Without picking hairs, all f/1.4 lenses will have the same depth of field.

Relatively inexpensive, extremely fast prime; Autofocus is internal, pretty fast, and quiet; A little soft wide open, but sharpens up quickly as you stop down; Nice bokeh

A little soft wide open; If you upgrade to full frame, the lens is usless

Perfect lens if it focused properly out of the box. Lens has a little front focus on my Rebel t3i. Sent to Sigma for calibration with camera body still waiting for it to return. Otherwise good quality lens.

Yes, I would recommend this to a friend

Great solid heavy build; Nice Bokeh; Smooth and weighted focus

Corner Sharpness

The Sigma 30/1.4 DC HSM is capable of yielding impressive results, as long as focusing is accurate. Center sharpness was good even wide open and vignetting was well controlled. Distortion was low and chromatic aberration, though present, was again well controlled.