Zoom too awkward to use but the Fisheye is very cool.
589762
The zoom is just too hard to keep stable. (they do give you a nifty little tripod so they must be aware that this is going to be a problem.)  The other problem I ran into is that twisting the lens to "un-zoom" it, also unscrews it, so you have to be careful.  For me the zoom is just too awkward to use which is to bad because  I love the ability to  pull out my phone and take a quick picture or video. (I'm a grandfather of six.)

However,  the fisheye lens is VERY cool. Very small  but still takes a good quality picture or video.  I can see carrying it and the attachment device around in my pocket.
2694497
I was very impressed with the lens. I was a little disappointed when I couldn't zoom in as far I I thought it would.
3482546
nice camra but the 40 x zoom isn't as good as advertised.
1021232
First of all, to the previous reviewer who called this a "rubbish lens," because it has "the most serious distortion I have ever come across,":  did you really just pay hundreds of dollars for a fisheye lens without knowing what a fisheye lens is? Seriously? In case anyone else is confused, this lens is nothing like a normal lens. It provides a warped image which, when skillfully composed, can be quite unique and interesting (see the example images on the description page).

The Sigma 15mm Fisheye lens is well-made and provides sharp images. It has an aperture ring which locks in the f/22 position for use on modern cameras which set the aperture electronically. The lens cover is a sleeve which slides over the build-in lens hood. Oddly, there is a removable lens cap on the front of this piece. I don't know why you would ever remove the cap and leave the sleeve on, as this results in serious vignetting.

I enjoy this lens because of the new creative opportunities it provides. I love how you can get so much context around your subject, but beware, objects in the viewfinder are closer than they appear. It's easy for your pet or child to put his wet nose on your lens (which you can't protect with a filter). I recommend this lens for the photographer who has everything. You won't use it on every shot, but it offers a whole new perspective on the world.
707284
I do like the fact that you can screw the filters into each other to customize the amount of macro that you get, but there's a very small window of clarity in the pictures that you take due to a blurred fish eyed effect around the outside that takes up most of the image.
4119291
I used it for the first time this past weekend.  I liked everything about it except the zoom.  If you zoom in to close the images become blurry.  If you want close ups..get closer.  It is very easy to use, the picture is great. The instructions for setting things like EIS and the like could be a little clearer.
3716591
The adjustability is nice, and the nose bridge is quite comfortable.  However, the reading portion of the lens is too high for me.
709150
Fisheye and wide angle are ok, but the macro is hardly usable. I have to get the lens almost touching the item to photograph before it will even focus...and even then the edges are totally blurry.
3155164
I am happy with the video unless you need to zoom.  When you zoom, you can hear the zoom motor clicking along.  So that is a con to it.  It sounds like a sprinkler that goes around slow and then flips back "chick chick chick chick chick...."  But other than that, I like it.
1100165
The camera's zoom function is awkward, and its hard to stick it onto anything, but for 6 dollars I guess its not too bad
123998
Both my son and I had blurred vision and a headache after using for a short amount of time I realized it is because of the lack of adjustable lenses, meaning we were not looking directly through the center and they are not adjustable. I see many future applications and uses, but adjustments will need to be made to ensure that the lenses are adjustable. Closing one eye I was able to see the images projected and it was mind boggling how awesome it looked, but obviously not worth keeping to watch with one eye
1728827
The magnifying eyepiece works nicely and the viewfinder enlargement you get is great, but if you are wearing glasses, you will only be able to see the middle of it. Personally, I couldn't see anything past the autofocus sensor array. So I can only recommend this item to people who are able to press their eye to the viewfinder. This also explains why Nikon did not make this a default in their cameras.
3194911
To be fair, I bought this mainly for the macro lens, so my 4 stars are for that. The wide angle doesn't make a bit of difference from the camera lens and the fisheye is just ridiculous so I'd give those both a 1 star rating. But the macro....so much fun! I must look so goofy to people, walking around putting my phone an inch from various leaves, flowers, sand, whatever strikes me!  The depth of field is very shallow so you have to be rock steady but it's very doable. I often combine the macro with my camera zoom to get insanely close up! The clip itself is nice, too, with a rubber ring that protects your phone. It comes with a case which is nice to keep everything secure but I hate the fact that you have to screw the macro lens onto the wide angle lens to store it securely. It just falls out if you don't do that. Personally, I keep the macro lens on the clip at all times and keep that combo in a soft string bag that came with headphones or something else.
228279
This looks like a really neat toy, but you have to hold the camera or magnifier too close and it is just not that interesting when you do!
2422123
The lenses themselves are actually not that bad.  I actually had a lot of fun working with the Macro lens and got some really tight shots that were surprisingly detailed.

With that said, the product itself is kind of cumbersome.  I had a really difficult time getting the lens in and out of the plastic casing and even got a bobby pin to help pry them out.  I see why they want them tight so that the lens doesn't come out, but a new method of retrieving them would be better.

Honestly, I'm not sure how often I'd use this though.  It feels a bit novel and not something I'd use with frequency.

Hats off to the lens quality though.  If you are in the market for an iphone lens kit, this would work quite well.
2819954
wide AND reach....is better!  I also keep the fisheye in my pocket, pop it on and leave the big zoom hanging on one of the sides.
3674870
The good:
1. this lens really creates a delightful super-wide fish-eye effect, resulting in fun pictures, for a very decent price.
2. It comes in a nice, padded bag.
The bad:
1.  even on a tripod, with the highest care, the images from this lens are soft due to excessive purple fringing. It is not sharp, at least not on my perfectly good Lumix 14-45 lens and Panasonic Lumix G5.
2. when attaching the 58-to-52 attachment ring, the lens cover no longer fits. That is a small, unexpected nuisance.

Summary: it does what it says it does, but don't expect to blow up these pictures much above postcard size