The K&F Concept adapter enables the use of Leica M lenses on Sony E-mount cameras. This opens up new creative possibilities for photographers by allowing them to combine the legendary optics of Leica with the modern features of Sony cameras. This review examines the performance of the adapter in detail, taking into account aspects such as workmanship, functionality and value for money.
Workmanship
The K&F Concept adapter is made of brass and chrome steel, which gives it a solid and robust feel. The workmanship is precise and high quality. The bayonets for the lens and camera engage cleanly and securely without wobbling or jamming. The surfaces are well processed and the finish appears durable. The markings for the correct alignment of the lens are clearly visible.
Compared to cheaper adapters, the more precise manufacturing and the more robust material are noticeable. The higher weight of the adapter compared to plastic adapters contributes to stability and minimizes vibrations.
Functionality and handling
The adapter is purely mechanical and does not require an electronic connection. Therefore, functions such as autofocus, aperture control via the camera and data transfer (EXIF) are not supported.
The aperture must be set manually on the lens. Focusing is also done manually. This requires practice and patience, especially with fast lenses and wide open aperture. Using the focus peaking and screen magnifier on the Sony camera is recommended.
The adapter has a lens release button that is easy to reach and smooth. Mounting and dismounting the lens on the adapter and the adapter on the camera is easy.
Compatibility
The K&F Concept adapter is compatible with a wide range of Leica M lenses and all Sony E-mount cameras, both APS-C and full format. However, it should be noted that when using wide-angle lenses on full format cameras, vignetting may occur, depending on the specific lens.
It is advisable to check the compatibility of the respective lens before purchasing. Various Leica and third-party lenses were used in the test and there were no compatibility issues.
Value for money
The K&F Concept adapter offers good value for money at a price of around 30 euros. Although it is not the cheapest adapter on the market, the solid build quality, precise workmanship and reliable function justify the price.
Cheaper adapters can deteriorate in workmanship and fit, which can lead to problems with image quality and handling. The K&F Concept adapter is a good investment for photographers who want to use Leica M lenses on their Sony E-mount cameras.
Alternatives
There are various adapters from other manufacturers that offer a similar function. Some are cheaper, others more expensive. Choosing the right adapter depends on individual requirements and budget. Comparisons with adapters from Novoflex, Voigtländer and Metabones show that the K&F Concept adapter is a good mid-range option. It offers solid performance at an acceptable price.
Conclusion
The K&F Concept adapter for Leica M lens on Sony E mount camera is a high-quality and reliable adapter that enables the use of Leica M lenses on Sony cameras. The solid build quality, precise workmanship and good image quality are impressive.
The adapter is ideal for photographers who want to use the creative possibilities of manual focusing and aperture control and are looking for good value for money.

