Helped solve my focus issues on Canon 70D
593376
Solved the sharpness issue on my 70D. Was able to easily do microfine auto focus sharpness adjustment with this tool. My photos are now tack sharp.
4930770
We have a Canon SLR (IX, I think).  It's the precursor to the Rebel 2000.  Anyways, we had an older Sigma 28-200mm lens that somehow got out of whack.  It would no longer focus on close objects.  We went to a local retail outlet (Wolf), and bought this to replace our older Sigma 28-200mm lens.  The addition of the macro functionality is superb.
We can now take excellent pictures of our son (telephoto) and also landscapes and scenery (wide angle).  This is an excellent general purpose lens.
3394405
I just "arrived" to the world of DSLR cameras, a few months ago.
However, I found quite soon that the 'Package' lens included with my Canon DSLR (18-135 mm) was not enough for the kind of Photography I like to do.
On the contrary and as a Multi-purpose one, this Sigma lens set helped me since the very first time to make a very good job, even when my photo shooting work is certainly in the 'Rookie' level.
I mostly use it with AF on, and the camera+lens network does the rest.
Really happy with the results, this Sigma lens is certainly a Winner!!!
3675348
I bought this lens because my REAL Nikon film lenses did not perform well with my new digital SLR. To make the whole story short, I had invested $1400 in a digital SLR in hopes that I could use my Nikon lenses. But to my surprise...those lenses didn't perform well at all. So I took a chance on this Sigma lens (after reading the reviews of course). It was the least expensive lens in my bag but it gave the best result. The images were very sharp with good colors and detail. Again, thanks to those who took the time to write the earlier reviews. They had helped me tremendously.
1075241
I spent a lot of time trying to find a lens to take pics of my son playing basketball without breaking the bank. In short, this was it.

Be aware that this is a manual lens and you have to be willing to put in a little work if, like me, you used your DSLR almost as a point and shoot (all pro or semi pro photographers may now cringe).

This lens was very well reviewed by many knowledgeable, well meaning folks that used big words and scary concepts that didn't mean a thing to me. I went out on a limb and bought the thing. Angels sang and all was well with the world.

In short, I do miss the auto-focus, but it was a fair trade for good optics and low price!
3801029
I have a canon 18-55mm IS STM lens that need power from the camera to focus, so when I attached it to this I couldn't control the focus. Luckily I have 2 other lenses that don't need power to focus and they worked great with this.
4368525
I recently got back into film photography.  I picked up a bunch of 30 year old Minolta AF A-mount lenses for my old Minolta SLR.  I got some beautiful, high quality Minolta lenses used.

The natural progression then was to use them on my Sony A6500.  This adapter is exactly what I needed to do that.

It has a screw-drive so that it can auto focus the Minolta lenses.  As I understand it, the LA-EA3 does not.

I tested this out with my Minolta AF 85mm lens and compared it to my Sony 85mm lens.  There is certainly more hunting (attempting to acquire focus) using the Minolta lens and there are less autofocus points when using this adapter and adapted lenses.  Other than those minor issues, which are to be expected I suppose, this adapter is a great addition to my camera.  It allows me to use a lot of old, inexpensive lenses to take great photos.

I am happy I picked this up.
4504567
Took a few RTFM cycles before I figured out to retract the focus screw, place the base notch on the lock button, and set the feet, but once I got it to settle in place, it was stable enough.
Once I stopped using the wrong glasses it just required a slow hand on the focuser and some slight head movements to find the dust on the surface.
1352788
It's been a while since I've owned this, but it worked really well for me! No Auto focus, of course, but my sony A7s had focus assist and so I never needed it anyways! I never noticed any vignetting on either of my canon lenses, it always worked great!
1671871
Very happy with the Tamron 24-70 Di VC lens so far. Much better perfomance than my Nikon 24-70 had. Let me give a little background on my experience with the Nikon lens:

Used it on a D90 and D700 initially, with pretty decent results on the D700, but not so good on the D90. After upgrading the D90 to D7000, the lens still did not produce very good images on DX, but still worked fairly good on the D700. I figured it was just optimized for FX and was simply not going to work well on DX. I upgraded my D7000 to D7100 early this year, and had the same experience with this combo. I really wanted to use the new camera with it, so I sent the lens in to Nikon for adjustment, and to replace the filter thread at the end of the lens and ended up with a $612 repair bill from Nikon. That would be totally worth it if the lens was working better afterward. Unfortunately, performance was still not very good on the D7100. Kept it anyway, since it was working OK on the D700. Sold the D700 in August and bought a D810...lens problems were more evident on the new 36MP camera that I had not noticed before. Many images were slightly out of focus, and far left and right sides were not terribly sharp. To be fair, printed images looked fine if not enlarged much, but screen viewing showed the problems. Did a ton of testing and found that the lens required different AF fine-tune settings at different focal lengths. -8 at 35mm, -20 at 50mm, and -11 at 70mm. No wonder some shots were OK and others were soft. Both cameras showed similar variances in fine-tune values. And Nikon said that the lens was within specs? Wasn't too impressed by that...

Finally sold the lens and bought this Tamron. First shot with the D810 at f2.8 was sharp, sharp, sharp, with no fine-tune. Tried it at all focal lengths with the same awesome result. Put it on the D7100 and was amazed at how good the shots looked. I could never get anything that good out of the Nikon without stopping down. The optics are super sharp and the stabilization makes a huge difference. Both cameras nail focus every time, and color and contrast is nearly equal to the old Nikon.

The lens is not perfect, though. Distortion is higher at 24-30 mm, and also at 60-70mm. The lens vignettes more on full frame than the Nikon did, too. And the auto focus is not as fast. You get spoiled with the blazing fast focus that Nikon's higher end lenses deliver, and the Tamron is noticeably slower. The corners are also a tad bit softer than the Nikon at equivalent apertures.

However, the lens deserves 5 stars, due to the following: I will take slightly slower focus with a consistent hit rate, over faster but inconsistent focus, any day of the week. The distortion and vignetting is easily corrected in post processing. The corners, while not quite on par with the Nikon, are still really, really good. In fact, the overall quality of the optics is so impressive, it is difficult to tell the difference between images shot with the Tamron, and ones taken with the more expensive Nikon. And, lastly, the image stabilization really puts the other lenses by Sigma, Nikon and Canon to shame. Especially for the Nikon and Canon versions to be close to, or above, the $2,000 range and not have it.

I believe this is easily the best value in this category of lens. Happy that I can use this lens without any hesitation, knowing that it will deliver the results that I always wanted out of the Nikon. Turns out to be a very nice "upgrade" for me.
4856792
Does everything it's supposed to without losing one bit of my field of view. This was super easy to install and really improved my manual focus shots. I definitely recommend it!
4725713
I purchased this after finding that on closer examination of my enlarged images there were a surprising number of images that were out of focus or had the depth of field off of what I had planned. These images were taken through the optical viewfinder. I then began to use this on my Canon 5D Mk II while focusing through live view on the LCD, using this to magnify the LCD so I can focus exactly where I wish.
The percentage of sharp images increased substantially and now I use this all the time when I'm serious about my images. I found that focusing through the live view with this is substantially better than focusing through the optical viewfinder and the images are substantially sharper (plus you avoid any mirror vibration using this method).
A must-have accessory for serious photography!
3020990
I have a large collection of Canon EOS glass and bought this to use them with my X-T1.  At first, I couldn't get the shutter to fire but then found a tutorial for using lens adapters with the Sony NEX-7 which I also own.  There, I learned to enable a "shoot without lens" setting. It's buried on p. 81 of the X-T1 owner's manual and doesn't say why one would need to use this.  So, once that was turned on, the Fotasy works fine.  Fotasy could have saved me quite a bit of lost time had it included this information in its packaging.  That and some extra effort required to remove it from the lens costs this a star, but overall I'm happy with the product.  The fact you need to focus manually is no problem with this camera, which makes it easy.  The aperture ring is a nice touch.
1102413
Initially I had a problem with this product. The packing slip suggested that the owner of the firm be contacted via email if there was any problem, so I did.  I received a replacement promptly.  I was impressed with the service.  I will order from this vendor again.  I've had no problems with the product since I purchased it months ago.

This is a must-have for this camera.  Otherwise, your lens will scratch. Too bad that Canon didn't  design it so that a standard filter wouldn't work.  But for the money, this is the best (only solution that I found). By the way, I stopped into  a camera shop and was told there was no solution.  Glad I found this one.
3201758
I got this lens yesterday and was thrown "into the fire." Newspaper wanted me to shoot a portrait of someone that evening and I barely had a chance to get acclimated to it, especially reading comments about focusing at f/1.2. As it turned out, shooting at f/1.2 was somewhat tricky, but I knew better to take lots of shots. Those that were right on the money produced very nice bokeh. The fast aperture sure came in handy in a poorly lit room. Already it's paying off. By the way, the weight of the lens by itself is quite heavy, but mounted on the Canon EOS 1D Mark III, it's well balanced in my hands. The auto focus was slower than all my other lenses, but not unbearable like some had noted. Fast enough for portraits, but maybe slow for sports photography. Looking past the sticker price, I'm thrilled to work with this lens and hoping to get eye-catching images.
3440232
I am using this on a Canon EOS Rebel T4i (650D) with the Canon EF 24-105mm f/4L IS USM lens, and will allow you to get within inches of the object to be photographed.  You will need to zoom it to at least 50MM before you get enough distance to focus on an object.  Focus is impossible at less than 50MM zoom.  The reason I gave it 4 stars instead of 5 is because autofocus is extremely difficult to achieve at this distance.  The camera will hunt for focus from Macro to Infinity and back non-stop.  You must set the lens to Manual focus and rely on the viewfinder to focus on the object yourself.
2284669
<div id="video-block-R1M7DVUGEUOU70" class="a-section a-spacing-small a-spacing-top-mini video-block"></div><input type="hidden" name="" value="https://images-na.ssl-images-amazon.com/images/I/A13icVSnlgS.mp4" class="video-url"><input type="hidden" name="" value="https://images-na.ssl-images-amazon.com/images/I/21Wdkjy2nOS.png" class="video-slate-img-url">&nbsp;Just started to use for my canon 50mm STM lens I am happy so far as it helps to cut down light, not yet seen if this has any impact on the video quality, will provide an update after some more use.
Update on use, i have tried out and it is good to see the tone down of the exposure to match the needs. Sample video attached