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MkrGeo

An original point of view

Photography

The cell phone camera lens kit in real use

Xiaomi Mi 9

Black ant seen through the 15x macro lens attached to the Xiaomi Mi 9 smartphone.

Nowadays smartphones are able to take good pictures. I know it, after testing both Xiaomi devices Mi 8 and Mi 9. You have your own opinions, once you owe another model. My examples will come from these 2 devices, that I had occasion for the rough description. Among quite a few image options in these models, there are zoom and macro types. As everyone knows, these modes aren’t really useful due to the lack of a decent optical lens built up in the model. The majority of smartphones are equipped with 2x optical zoom only. In this case, each option of bigger magnification (eagerly offered by providers) is purely digital, which leads to huge quality deterioration caused by excessive sharpening.
Apart from zoom and macro, a good attention can be stuck to the wide-angle options, which also aren’t perfect in some devices, like Xiaomi Mi 9.

In this article, I would like to discuss something like an alternative to these problems, for users who desire more, than standard image features provided by the devices and answer is it worth to bother or not.
The first thing, that came to my mind was: If I can equip my DSLR camera with random lenses, can I do the same with my smartphone then?
I found, that obviously YES 🙂

There are a lot of cell phone camera lens kits available for sell. You just neet to visit some web shop i.e. Amazon and search for them. The prices differ, although there are a lot of cheaper options. The cheapest one you can get for even around 10-15GBP.

I bought my cell phone lens kit for 25GBP. This kit is fully equipped with different kinds of lenses, possible to attach into your smartphone (Pic. 1).

Amazon phone lens kit

Pic. 1 Cell Phone Camera Lens Kit provided by Bostionye company on Amazon.

I picked up the Bostionye company, quite randomly. Because the price wasn’t deterrent I thought, that why not try. They have also a kit with 20x telephoto lens as shown above.

I would like to describe this Cell Phone Camera Lens Kit below, all elements one by one. I have done my tests on 3 smartphones: Samsung Galaxy S5, Xiaomi Mi 8 and Xiaomi Mi 9. The best test has been done with the recent one – Xiaomi Mi 9.

CELL PHONE LENS KIT WITH SAMSUNG GALAXY S5

Samsung Galaxy S5 was my first good smartphone, which I bought around 3 years ago. First lens, which I used straight after unpacking this kit was the 12x zoom.  Unfortunately, the first impression wasn’t nice. I found, that  the image given is really distorted. Only the very middle of the screen was looking nice (Pic. 2).

Cell phone lens kit in Samsung Galaxy S5

Pic. 2 Zoom lens in use with Samsung Galaxy S5. Red outlines show the best image performance. Waterbeach, United Kingdom. Waterbeach, United Kingdom.

So, the first conclusion states, that you must keep your lens possibly as close as possible to your cellphone camera. The lens should be as much centered as possible, otherwise, your image won’t be good at all.
Unlike the zoom lens, the macro is far better. The rule with centering the lens against the cellphone camera is still valid, but distortion isn’t as much expressed as in the zoom case (Pic. 3). A default macro enlargement is 15x.

Samsung Galaxy S5 kit lens macro

Pic. 3 The macro lens attached to the Samsung Galaxy S5 .

Apart from zoom and macro lenses, that I used a lot to be honest, there are another few lenses: 198° fisheye, 2x telephoto lens, kaleidoscope lens, CPL mobile phone lens, 0.63x wide and star filter lens. With Samsung Galaxy S5 I tested only the fisheye (Pic. 4) and kaleidoscope (Pic. 5).

Fisheye lens Samsung Galaxy S5

Pic. 4 Fisheye 198° lens attached to the Samsung Galaxy S5. Harding Close, Waterbeach, United Kingdom.

Samsung Galaxy S5 kaleidoscope lens

Pic. 5 Kaleidoscope lens tested with the Samsung Galaxy S5.

In all cases you must center this lens to your phone camera. Otherwise, besides the poor sharpness you will get a dark edge on your screen. More tests have been carried out with Xiaomi devices.

CELL PHONE LENS KIT WITH XIAOMI MI 8

Using the Xiaomi Mi 8 I checked the quality of the following Cell Phone Kit Lens regarding the camera options featured by this device. In this device, I tested only a 2x and 12x telephoto lens. I cannot hide, that the telephoto lens is one of my favourite, because of far realing views, that I really like. Regarding Xiaomi Mi 8 I used only 3 basic photo modes: normal photo, 2x zoom, and panorama.

Xiaomi Mi 8 12x telephoto lens

Pic. 6 12x telephoto lens applied to the Xiaomi Mi 8 6GB 128GB (Global version) with red marked areas pointing areas with the best quality. Cambridge & Waterbeach, United Kingdom.

The situation looks the same as in the Samsung Galaxy S5. In both cases, I attached the telephoto lens quickly, without further adjustments. As a result the focus response was really poor. There are pictures, which are blurry even in the middle, where the image should be the best. The principle is, that when closer to the view edge, then the image is getting poor. The very center of the enlargement tool is always the best and can bring a decent view once your autofocus response is fine (what you can set manually also). The image looks slightly better when using only a 2x telephoto lens (Pic. 9), but it’s not the same, unfortunately.

Xiaomi Mi 8 telephoto lens test

Pic. 9 2x and 12x telephoto lenses attached to the Xiaomi Mi 8 smartphone, where also a 2x optical zoom has been used. Parker’s Piece, Cambridge, United Kingdom.

On the other way, in Mi8 we can use 2x optical zoom and multiple twice our view. Utmost zoom result will be 24x, but we must set our autofocus deliberately because it’s quite sensitive at this enlargement. When you try it enough, your pictures can be quite good in places (Pic.9,  10).

Xiaomi Mi 8 telephoto lens cropped

Pic. 10 2x and 12x telephoto lenses attached to the Xiaomi Mi 8 smartphone, where also a 2x optical zoom has been used. Cropped images in the very middle, featuring best sharpness and quality. Parker’s Piece, Cambridge, United Kingdom.

Xiaomi Mi 8 2x telephoto and 12x telephoto lens cropped

Pic. 11 Xiaomi Mi 8 6GB 128GB (Global version) with 2x optical zoom, 2x telephoto lens and 12x telephoto lens attached in action. Image cropped. View on sign standing 230m ahead. Cambridge Road, Waterbeach, United Kingdom.

It’s good to mention also about the panorama mode, which also can be adopted into the aforementioned lenses. A pivotal thing is an angular extent of the panoramic picture, that is going to be dramatically reduced as bigger zoom we will apply.

The graph below (Pic. 12) shows the relation between the zoom factor and the angular extent of your panoramic picture. It applies to the Xiaomi Mi 9 too, about which you can see later in this post. Unfortunately, the Mi 9 doesn’t feature 2x optical zoom in panorama mode, so some of the patterns aren’t applicable.

Xiaomi Mi 8 and 9 telephoto zoom panorama range

Pic. 12 Xiaomi Mi 8 & Mi 9 6GB 128GB (Global version) panorama range after telephoto lens appliance.

Let’s have a look at the panoramic picture in Xiaomi Mi 8 when the telephoto lens is applied. Because Mi 8 has an option to use 2x optical zoom in the panoramic mode I show you also a double one, multiplied by another 2x provided by the small telephoto lens (Pic. 13, 14).

Xiaomi Mi 8 2x telephoto lens panorama

Pic. 13 The panoramic picture was taken by Xiaomi Mi 8 with a 2x telephoto lens applied. Parker’s Piece, Cambridge, United Kingdom. Click to enlarge.

Xiaomi Mi 8 2x zoom opanorama with 2x telephoto lens

Pic. 14 Panoramic picture with 2x zoom taken by Xiaomi Mi 8 with 2x telephoto lens applied. Parker’s Piece, Cambridge, United Kingdom. Click to enlarge.

Watching these 2 images a first conclusion comes to mind – do it as slow as possible. Another thing is proper to attach the lens to your phone camera. Otherwise, you will get an unpleasant dark area (Pic. 13) or your image won’t be sharp in places. Because I have done these panoramas very quickly, none of them is really useful. Again, bigger zoom requires bigger attention in the autofocus settings.
Continuing below, let’s see the panoramas made with a 12x telephoto lens as well as 2x optical zoom multiplication (Pic. 15-17).

Mi 8 panorama 12x telephoto lens

Mi 8 panorama 12x telephoto lens2

Pic. 15, 16 An example of Xiaomi Mi 8 6GB 128GB (Global version) panoramic picture with 12x telephoto zoom attached. 15 – Waterbeach, Cambridge Road; 16 Parker’s Piece, Cambridge, United Kingdom. Click to enlarge.

Xiaomi Mi 8 2x zoom and 12x telephoto lens

Pic. 17 Xiaomi Mi 8 6GB 128GB (Global version) panoramic picture with 2x zoom mode and 12x telephoto lens attached. Parker’s Piece, Cambridge, United Kingdom. Click to enlarge.

CELL PHONE LENS KIT WITH XIAOMI MI 9

The widest test has been carried out with Xiaomi Mi 9 6GB 128GB (Global version), which is my own new smartphone. I tested all lenses in the following categories driven by imaging modes featured by this device. I am going to point all of them underneath in terms of the specified lens attached to the Mi 9 smartphone.

1 – 12x telephoto lens – traditionally it goes as a first lens. It was tested alongside with 2x telephoto lenses, which can be a bit more useful in Mi 9 instead of Mi 8 for two reasons implicitly. Because the Mi 9 doesn’t support 2x optical zoom for panorama mode, we can use 2x telephoto and have a bit sharper image. It applies also to 48MP mode, which has wide-angle features. Unfortunately in the 2nd case, we can’t escape from the awful dark edges seen in our image.
To getting around more widely with both lenses I would like to show both crop pictures as well as a digital zoom in action.

Mi 9 telephoto lens test

Pic. 18 Xiaomi Mi 9 6GB 128GB (Global version) images with a 12x telephoto lens attached. On the left normal image with 12x telephoto, on the right 2x zoom with 12x telephoto. The Vivo retail gallery, Krosno, Poland.

Mi 9 with 12x telephoto lenses horizontal

Pic. 19 Xiaomi Mi 9 6GB 128GB (Global version) with a 12x telephoto lens attached. Upper image only 12x zoom, lower image 12x telephoto x 2x optical device zoom. View from the Vivo retail gallery in Krosno towards the Rymanów Hills, Poland.

Unfortunately, there are not many details revealed, as we can see in the example below (Pic. 20, 21). The sharpness affliction impact on the quality, making an image fuzzy, what is the best visible when we want to grab some small detail or text.

Mi 9 12x telephoto lens reading test

Mi 9 12x telephoto reading test cropped

Pic. 20, 21 The best 12x telephoto lens test on Xiaomi Mi 9 smartphone – reading abilities from about 50m distance: Left – 12x telephoto magnification; right – 2x optical zoom and 12x telephoto magnification. 20 – normal image; 21 – cropped. The Vivo retail gallery in Krosno, Poland.

The images above expose the major disadvantage of this lens – utter lack of sharpness. It can be helpful, but not for small things.

Xiaomi Mi 9 12x telephoto lens

Pic. 22 Xiaomi Mi 9 smartphone with a 12x telephoto lens attached. Left – default image with 12x telephoto zoom; right – 2x optical zoom with 12x telephoto zoom. See the cropped sections underneath. View from the Vivo Gallery on the “Hotel Nafta Krosno” at 750m distance, Poland.

Let’s see how it looks when the digital Mi 9 zoom is in action. Basically, pictures are much worse, which is understandable (Pic. 23-24).

Mi 9 digital zoom with 12x telephoto

Mi 9 digital zoom with 12x telephoto 2

Pic. 23,24 Using the Xiaomi Mi 9 digital zoom along with the 12x telephoto lens attached for object capturing at about 400m distance (23) and 800m distance (24). Saint John from Dukla church, Krosno.

It can work only for objects, that don’t feature many details likewise metal cross, table, long roof, etc. Capturing objects on longer distances, our vista can be merged into one blurry spot, when object is too thin (Pic. 25).

Mi 9 with 12x telephoto lens, distant objects

Pic. 25 Xiaomi Mi 9 6GB 128GB (Global version) picture with 12x telephoto lens attached and digital zoom applied for distant objects. View on the Sucha Góa TV Tower from Odrzykoń-Zawodzie, at about 8km distance, Poland. See also cropped images below. Click to enlarge.

The best quality of the 12x telephoto lens comes along with the 48MP mode (Pic. 26). A wide-angle feature of this image format covering up slightly the main demerits of this telephoto. However a considerable distortion is to be seen near the image edges likewise in the Mi 9 wide-angle mode.

Mi 9 48MP image with 12x telephoto lens

Pic. 26 Typical Mi 9 48MP image with a 12x telephoto lens attached. Merkury Market retail store, Krosno, Poland.

Watch the 2x telephoto lens features on the footage below:

2 – 15x macro lens – this is the lens, which I truly recommend to use. The 15x zoom into the nearest objects works quite good. The image is not perfect, but decent.

First of all, let’s compare the macro view between standard 2x offered by Mi 8 (2x optical zoom) and 15x attached with lens (Pic. 27).

Xiaomi Mi 9 2x zoom withn 15x macro attached.

Pic. 27 Xiaomi Mi 9 6GB 128GB (Global version) image comparison between 2x optical zoom and 15x macro lens attached. Left – common daisy; right – common dandelion.

As you can see, the 15x macro lens works quite good. The major thing here is autofocus, which is hard to set, as your phone or the object is in motion. The principle here is exactly the same as in the zoom; the same amount of magnification multiplies the sensitivity. It makes a challenge to get our picture sharp enough, especially when some of the objects move i.e. insects.
Because we can also combine our 2x zoom feature with the 15x macro lens attached, the images can be quite interesting, despite the area of sharpness is confined (Pic. 28).

Xiaomi Mi 9 macro image test 15x and 15x with 2x optical zoom

Pic. 28 Xiaomi Mi 9 smartphone with 15x macro zoom attached as well as 2x optical zoom feature used. Left row – 15x macro images; right row – 15x macro with 2x optical zoom feature. Top – elderberry flower buds; 2nd – cow parsley flower; 3rd – apple tree flower; 4th – plum tree flower buds.

Even cropped images don’t look bad (Pic. 29).

Xiaomi Mi 9 macro image test 15x and 15x with 2x optical zoom,cropped

Pic. 29 The same images collected from the previous picture in the same order and cropped.

See also another example, where the elements are often in motion (Pic. 30), hence the image cropping is not necessary as the quality is deteriorated by movement.

Xiaomi Mi 9 macro image test 15x and 15x with 2x optical zoom2

Pic. 30 Xiaomi Mi 9 smartphone with 15x macro zoom attached as well as 2x optical zoom feature used. Left row – 15x macro images; right row – 15x macro with 2x optical zoom feature. 1st and 2nd row – black garden ant; 3rd row – Shepherd’s purse.

The image above reveals an important focus feature. It looks like the 15x macro lens isn’t precise enough as moves closer to the edges. The best result is to be seen when the surface is captured from the top and less seen in case of a tilt-shift position. The last row shows a Shepherd’s Purse, a weed characteristic for pavements, cobbled surfaces or road edges, which is often exposed on the wind. The image shows a kind of tilt-shift position, where only flower buds are sharp enough.

Xiaomi Mi 9 smartphone with 15x macro attached

Pic. 31 This image shows roughly how the sharpness is distributed across the 15x macro lens view.

More examples below… (Pic. 32,33).

Xiaomi Mi 9 15x macro lens attached

Xiaomi Mi 9 15x macro lens attached2

Pic. 32, 33 Another example of Mi 9 pictures with a 15x macro lens attached and 2x optical zoom used (on the right). 29- Cherry tree flower; 30 – Kalanchoe pinnata.

The macro photo with 48MP mode looks also good (Pic. 34). The crop is not needed here, because the 48MP mode is built by pixel interpolation.

Xiaomi Mi 9 48MP picture with 15x macro lens attached

Pic. 34 Xiaomi Mi 9 48MP image with a 15x macro lens attached.

3 – fish eye 198° – this lens could be beneficial, although its mount is too high against the glass position. In turn, you cannot escape from the awful dark edge surrounding your image (Pic. 35-36), unless you run the 2x zoom facility. Then it can work.

Xiaomi Mi 9 fisheye lens comparison

Pic. 35 Fisheye lens 198° working with the Xiaomi Mi 9 6GB 128GB (Global version) main cameras.

Mi 9 fish eye lens flare

Pic. 36 A flare effect visible in the fisheye lens attached to the Xiaomi Mi 9 smartphone.

4 – Good lens to use can be the 0.63x wide, which goes strictly alongside a 15x macro lens. Writing “strictly alongside” I mean, that you must have them both attached if you want to gain the effect. The 0.63x wide lens alone won’t be stuck into your smartphone because of the wrong thread, which matches the 15x macro lens only. This is a quite awkward feature, especially, that both of them are small and unscrewing them can be a challenge. Anyway, if you got into the grip, and mount them together into your device, the result will be a slightly wider view on your screen.
I believe, that for Xiaomi Mi 9 6GB 128GB (Global version) the 0.63x wide lens can be a good alternative for the wide-angle mode, being botched by producers, unfortunately. However, it must be used at least with normal photo mode (Pic. 34).

Xiaomi Mi 9 with 0.63x wide lens

Pic. 37 Xiaomi Mi 9 smartphone with a 0.63x wide lens attached. Waterbeach Recreation Ground, United Kingdom.

Seeing the picture above we can conclude, that combination this lens with normal photo mode gives a better image, than the wide-angle mode provided. On the other hand, using this lens with the wide-angle mode can deteriorate the effect cinsiderably. Look at the upper image, where we have both distortions caused by poor wide-angle effect as well as dark edge of the lens mount, covered by this glass.

5 – Last kind of lens, which I tested was the kaleidoscope lens. There is no opinion about the quality as it brings a completely different of the image character (Pic. 38, 39). Major demerit, which is the dark edge caused by the lens mount won’t dissapear unless you turn into 2x zoom (Pic. 40).

Xiaomi Mi 9 and Kaleidoscope lens

Xiaomi Mi 9 and Kaleidoscope lens

Pic. 38-39 The Kaleidoscope lens example attached to the Xiaomi Mi 9 6Gb 128GB (Global version). Waterbeach Recreation Ground, United Kingdom.

Xiaomi Mi 9 and Kaleidoscope lens2

Pic. 40 Kaleidoscope lens attached to Xiaomi Mi 9 smartphone with 2x zoom mode. Waterbeach Recreation Ground, Cambridge.

MAGNIFIER APPS VERSUS THE CELL PHONE LENS

In the last section of this work I would like to point out, that there is multitude of “Magnifier” apps available for Android. I had an ocassion to install two of them – the best-rated, in order to compare their quality to the cell phone lenses quality. I took into account only zoom and macro, that are the most often used by myself.

Magnifying glass apps available on Android

Pic. 41 Some of the “Magnifier” apps available for Android.

I can admit, that the best of them is the Magnifying Glass app at the bottom of the picture. This brand new app triggers your digital zoom properly, giving you quicker way to achieve the enlargment.

Magnifying glass app, Mi 9

Pic. 42 The Magnifying glass app on Mi 9 smartphone.

But the images are still noisy, according to the Mi 9 zoom properties (Pic. 43, 44). The image quality can vary depends on your smartphone I believe.

Mi 9 magnifying glass app

Mi 9 magnifying glass app2

Pic. 43,44 Comparison of photo quality between the Magnifying Glass Android app (2019) and the 15x macro lens attached to the Xiaomi Mi 9 smartphone. Click to enlarge.

Another two apps are doing much worse. They invoke the device zoom mistakingly, making the images basically out of question (Pic. 47, 48). The image capturing is not needed as the quality is shown yet in the preview mode (Pic. 45, 46).

Mi 9 magnifier app test

Pic. 45 Comparison between the 10x zoom offered by Xiaomi Mi 9 device and its strong deterioration in the Magnifier app.

Mi 9 magnifier app test2

Pic. 46 The Microscope function in the Magnifier app doesn’t change anything. The image received is really bad.

In another magnifying glass app (Cozy magnifier) the situation is not better, to be honest (Pic. 47). Both macro and zoom are not acceptable, as the digital zoom from your device is activated falsely.

Cozy magnifier (magnifying glass) app in the Mi 9 device.

Pic. 47 Zoom and macro demonstration with the Cozy magnifier app used with Xiaomi Mi 9 smartphone.

Let’s have a look at the relationship with the 12x telephoto lens (Pic. 48).

Xiaomi Mi 9 12x telephoto lens and magnifier apps

Pic. 48 The quality correlation between the 12x telephoto lens and the “Magnifier” apps in the Xiaomi Mi 9 device.

In fact, the zoom difference is slight in the apps (10x), but their quality is unacceptable. The image given by the 12x telephoto lens attached is far better, although even here there is a lot for an upgrade in the future.

CONCLUSIONS

There is no cheap option for getting your cell phone view better, as offered by the producer, unfortunately. Despite a wide choice of the kit lenses, available literally for a song, the view as they offer is poor. In the case of my example, I believe, that you can buy the set including macro only, without additional lenses, which are basically rubbish. I bought this kit as a trial, however, I wish I could spend more money and purchase something for 100GBP instead of 25GBP only. To be honest, there is at least 50% of the cell phone kit lens available for this small price. It means, that none of them are good enough. I hope, that this test will help you with better consideration of the purchase like this. Besides the poor kit phone lens, an option with Android apps is also not good enough. It’s even worse I would say, although at least you don’t pay anything. Some of these apps feature the “Pro” version, but I believe, that they’re not worthy and moreover cost more, than this single kit lens.
I will probably use this kit lens, but not often and on an emergency basis, for instance when my camera will be run out of battery. Probably, the macro lens will be used often, due to relatively the best quality.
Sad to say at the very end, that this budget purchasing wasn’t a good idea, but…every day is a school day 🙂

Mariusz Krukar

Links:

1. Bostionye cell phone kit lens at Amazon
2. Cell phone kit lens at Amazon
3. Best lenses for Iphone and Android

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