MonsterAdapter’s new LA-KE1 adapter brings autofocus, aperture control to Pentax K-mount lenses on Sony E-mount cameras

MonsterAdapter, a relatively new player in the lens adapter game, has revealed the details of the LA-KE1, a new adapter that will make it possible to mount Pentax K-mount glass to Sony E-mount mirrorless camera systems.

There isn’t much information available about MonsterAdapter. The company’s Facebook page, which appears to be its only online presence, was created on May 20, 2020, when the company announced the development of the LA-EA4r, a modified version of Sony’s LA-EA4 adapter that expanded functionality and support. MonsterAdapters has since released another adapter, the LA-VE1, which makes it possible to adapt Minolta Vectis V-mount lenses to Sony E-mount mirrorless cameras.

Now, the company is promoting its forthcoming LA-KE1, which it claims is the ‘first of its kind in the world.’ The adapter offers full autofocus, aperture control and EXIF data transfer for Pentax K-mount lenses (KAF, KAF2, KAF3 and KAF4) to Sony E-mount cameras. The adapter uses a pair of motors for turning the screw-drive autofocus in older K-mount lenses.

This not only brings the ability to shoot with Pentax lenses to Sony E-mount cameras, but also enables many of Sony’s AI-assisted focusing modes to be used with the Pentax lenses, new and old. MonsterAdapter says the exact functionality will vary depending on what camera you’re using — noting a more powerful camera likely means more features — but both Human and Animal Eye-AF focus modes should be able to work on adapted glass.

MonsterAdapter also notes that due to the limits of screw-drive lenses, this adapter is best suited for still photographs—not video. In addition to the images of the prototype adapter in this article, SonyAlphaRumors has also shared a hands-on video demonstration of it in action:

No price is given for the LA-KE1 adapter, but it is set to ‘hit the market within this year,’ according to the company’s announcement post. You can keep up with the latest news on MonsterAdapter’s Facebook page.