It's noisy when focusing, and the minimum focus distance isn't great

Its good lens i use it with my canon t6i rebel and i love the fast focus and crisp picture

But the zones that are partially out of focus look bizarre, as if there are two images superimposed on top of each other... or a picture with two flashes that went off while zooming out

But, it's a great lens - sharp as a tack, beautiful tones, quick focusing.

Sharp photos, fast focus.....awesome

I wouldn't hesitate to shoot indoor sports with this using the 6D's excellent center focus point

Even when using the center AF point, it is easy to miss the focus due to shallow depth of field.

Pros===SharpnessBokehFocus accuracy (single-point)Focus speed (single-point)Zero distortionExcellent contrastExcellent color transmissionProfessional build qualityWonderful manual focus ringAmazing picture quality overallVery nice carrying caseExcellent lens cap, doesn't pop off, etc

In other words they are trying to replace a good focusing mechanism and a good quality control by charging the customer money to do their job

The sunflower photos was using the zip lock bag trick as a soft focus on a 36mp D810

The focus is fast and quiet

Nothing rattles or makes noise, and the focus is as fast as you could reasonably expect

Amazing sharpness, and much higher likelihood to obtain perfect focus

Now my copy does miss focus sometimes but, I get 85-90% keepers at f1.4 - f2.0 which is where this lens lives

feels cheap.-The focus isn't consistent out of the box

I was very sad upon initially putting this lens on my camera and it having awful focusing issues

The sunflower photos was using the zip lock bag trick as a soft focus on a 36mp D810

Manual focus (which I use sometimes) is smooth and precise

First Impressions:When I received the product, I was very impressed with the weight, the build quality, the smooth manual focus with just the right amount of resistance to make it easy to be precise.

Sigma sells a USB dock (about $59), but I usually used the on-camera auto-focus fine tuning settings to fix issues

However, it misses focus over half the time.

Focus feels buttery smooth

Before I get into a wishlist for Sigma, here's what I love about the lens:-Solid feel, and well balanced on magnesium alloyed camera bodies.-Very sharp wide open.-Insanely sharp stopped down, even competes with the Zeiss Otus at F4.-Very little to no distortion.-Well controlled chromatic aberration and little sagittal flaring.-Smooth focus ring.-Decent styling.-Great microcontrast

Both pictures were taken focusing on the doll's face; notice how in one of them the face is out of focus while the hand seems to be very well focused (that's the complete opposite of what we want!

This lens has an absolutely HORRIBLE focus issue

The only issue with this lens is the inconsistent focus I have at around 1 meter.

Whether it was front focusing, back focusing, or inconsistent focus, it simply isn't a reliable lens

In fact, the 14mm lens made me realize how much better an image that prime lenses can create - increased contrast, sharper focus and (to my eye) more saturated color

Fast focus.

Incredibly sharp focus and beautiful blur at f/1.4

It took me almost a week to get focus corrected

Excellent and incredible lens, very clear and very sharp, the focus is very fast, I would recommend to any photographer who likes quality.

Of the 200 sigma images, it missed focus (just by a bit but nonetheless missed) 38 times out of 200

However the focus is so erratic its not even funny.

Beautiful lens, accurate focus, sharp as the 35mm 1.4

Initial on hand testing showed that the focus is very fast and accurate.

I rented Canon's 50mm 1.2 L lens, but found its focusing to be too slow for my work

The focus itself is fast and silent.

As compared to most other 50mm options, the depth of field isolation at a wide-open aperture is somehow smoother and ever so slightly wider than with others - which means I can isolate a model's face, but keep both eyes and nose in focus - impossible to do with most 50s - I'm always forced to choose which will be slightly out of focus, and this lens lets me get just enough breathing room to produce some stunning portraits, even though most of us don't think of a 50 as a portrait lens much of the time

After developing my raw files optimally using both Lightroom and Canon Digital photo - I find the Canon 50mm f/1.2L bokeh visibly superior to the Sigma one.

That's because I've never encountered an f/1.4 lens that begs to be shot wide open, all the time