I tend to view these mobile phone lens adapters as gimmicky plasticy junk that just sits in a drawer somewhere after being used exactly once... 9 times out of 10 that is the case. Not this time! This cool device essentially turns your phone camera into a digital microscope. The addition of a ring light around the lens is crucial here and the execution is well thought out. The ring light enables your subject to be in full light even when the lens is literally sitting on top of the object you are viewing. I used a piece of cloth as an example. The first image is at the standard 1x from my Pixel 8 Pro. The second image is using the same 1x camera on my phone but with this 150x lens adapter in front of it. The results are insane and totally unexpected! I can't wait to try this lens out on more objects around my home. Highly impressed! 5/5

This lens takes a little bit to figure out but I am loving it! I bought it to use the macro lens and it is perfect

It includes 3 lens, worth every penny.

These are easy to use and work great, you can combine multiple rings to get from 1 size lens to just about any other lens size. I didn't have any problems with them being stuck together or anything (maybe some others forgot lefty loosey-righty tighty, idk lol)...anyway, i use these rings so i can swap my filters from lens to lens and also to make a macro/wide angle lens fit on teh end of my lenses, so I can use the macro on a 50mm or a 55-250mm zoom...pretty cool stuff :)

bought the adapter because I also want to use my existing Nikon lenses on the new BMPCC4K. Since the vast majority of lenses have an aperture lever, they can also be used although they do not have a separate aperture ring (lenses without an E-mark!). The adapter makes a very valuable impression. It is made of metal and feels good in the hand. It easily connects to the camera and lens. I haven't found any game so far. If this occurs during use and possibly leads to scattered light, I will provide an update. The adapter is delivered in a small plastic box. This makes it easy to store or transport when not in use. The silver ring is used to set the aperture. However, there are no numbers, only a symbol for an open and one for a closed aperture. But you can see directly on the display how turning the ring affects the brightness. So I don't miss numbers. In addition, I have read on other adapters with numbers on the ring that these values are not as finely graded as the numbers make it seem. I am very happy with this adapter. Of course, you lose light intensity because every assembly between the lens and the sensor "swallows" light. But this adapter only costs a fraction of what a Speed Booster costs. Also, you can't get a speed booster with contacts for Nikon lenses. No information is passed on to the camera, so you have to set everything manually even when using a speed booster. I can highly recommend this adapter to anyone who can get along with a somewhat lower light intensity.

Got the L/RL/M adapter to use a Leica R Macro lens on the Leica M for the few macro photos I take. I didn't feel like paying 160 EUR for an original Leica adapter, so I bought this one from K&F. R lens fits perfectly with no play, and the connection to the M camera is also perfect. It goes up and down nicely, without exerting any force, without anything wobbling. Perfect for my area of application. I've bought 3 K&F adapters so far and I'm super happy with them. They make a valuable, stable impression. It may be that after years they no longer have the quality of a Leica original due to larger manufacturing tolerances, but currently. it's great

Works fantastic! Turn any lens into a macro:O:D

And I want to respond to the comment that suggests losing the diaphragm. I disagree. I'm a professional photographer and just ran tests, I don't notice any loss of light. In this type of test it is necessary to be very rigorous, there are several possible approaches and I will give you one of them. 1/ Eliminate any outdoor light source that is constantly changing. I used LED lighting so I let the temperature rise nicely. 2/ To check the aperture of the lens you want to use, take a lens with an external aperture ring (I used a Nikon 50mm f/1.4D) on the adapter ring side. In this case it is important to set it to the closed position. It is the lens that takes control of the aperture. I set it to an aperture of 5.6. 3/Don't leave the sensitivity on auto (I set it to 400 ISO) 4/Take a photo of a very specific scene (you must have the same frame for the second photo) 5/Remove the ring and set a Fuji XF lens on the camera (I used the 16x50mm kit lens on the aperture first, or manual, of course the same aperture here 5.6). 6/ Take a picture of the scene (identical framing) and compare the speeds between the two photos. With a Fuji X-T10, the photo with the ring was darker, but the speed was faster. At the same speed, the photos are the same, so no loss of light. Now you should also know that each lens can have real differences in aperture compared to advertised values. Also, be careful when comparing speeds with another device. It is very likely that you have differences. Fuji, for example, cheats with the announced sensitivities. If it tells you ISO 200 you are actually at +- 120 ISO. Worse still, with an Olympus OMD EM10 I notice speed differences that can easily be doubled with a Nikon D800 (so 6400 iso Olympus = 3200 ISO on a Nikon D800 for example). Anyway, when a manufacturer announces that his device starts at 200 ISO and at 100 ISO there is a loss of dynamics, I understand that he is cheating on his 200 ISO, it is 100. Coming back to this ring: Personally, I don't find any flaws in it , except maybe its weight (130 g).