LA-KE1 - Pentax K-mount lenses to Sony E-mount cameras adapter (FW v05)

  • $439.00
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MonsterAdapter LA-KE1 electronic adapter is designed to adapt Pentax K Mount KAF lenses to Sony E Mount mirrorless bodies with the features including auto-focus, aperture control and EXIF recording etc.


Please beware the customs tax, if any, is not included.

Firmware updates

The latest firmware for MonsterAdapter LA-KE1 is v05.

If you are using an older version of firmware and want to download the latest firmware upgrade package, please download the updater here: (Windows PC Only)

Tip: How to track your package



  1. The world’s first and only AF adapter for K Mount! It’s equipped with dual motors for screw-drive AF and iris control from the camera body.*1
  2. Designed for full frame, offering options of more than 10 E-mount camera bodies for KAF lens users.
  3. Unleashs full potentials of KAF lenses with the most advanced PDAF capability from mirrorless bodies. With the reliable AF accuracy, you may be surprised by the sharpness of your old lenses like never before.
  4. Allows the bodies’ powerful PDAF capabilities*2 to work with KAF lenses, opening a whole new world for users with
    1. much larger AF points coverage across the frame;
    2. human & animal eye-focusing;
    3. AI-assisted continuous auto focus (AF-C) with high frame rates like 10-30 fps, whatever is offered by the mirrorless body;
  5. Compatible with KAF、KAF2、KAF3、KAF4 lenses.*3
  6. With built-in contacts, it can automatically recognize the lens mounted and transfer EXIF to the camera body.

Note: Because of the limits of the old screw-drive lenses like AF noise and power consumption, LA-KE1 is designed for still shooting only and its most features are not available when shooting videos.


LA-KE1 brings multiple AF advantages from Sony E bodies to Pentax KAF lenses, including hundreds of AF points across the frame, human/animal eye focus, real time AF tracking and AE in continuous shooting mode, etc.

Increased sharpness with your Vintage lenses

Your K-mount lenses now gets more sharper! By using cutting edge On-Sensor-Phase-Detection-AF technology of mirrorless cameras, screw driven lenses can get more precise AF results than before.

A7C + LA-KE1 + smc PENTAX-FA 43mm F1.9 Limited wide open


 Focus Points coverage

Extended Focus Point Coverage

The coverage of the focus point has been extended to almost full screen, allowing you to create more with freedom.


Human/pet's eye tracking

Now K-mount lenses can also achieve tracking on the eyes of people and pets, allowing the subject to look more brilliant in the photos.


AF and AE

Continuous AF and AE

LA-KE1 can make K-mount lenses achieve AF and AE continuously when shooting at a maximum of about 30 frames per second (camera support required) and the focusing accuracy will be highly improved at high-speed AFC mode



Shooting with Stabilization

The camera body will automatically enable 5-axis anti-shake stabilization while shooting, just like SR function on K-mount bodies.

SR Logo


G Driver II empowered

G Driver is MonsterAdapter's AF driver algorithm that provides faster, more accurate AF on available cameras. Based on MonsterAdapter's own tests, the firmware containing the G Driver can shorten the focusing time by an average of 25% and a maximum of 60% compared to the previous firmware.

Click here to check camera models that support G Driver I and II



LA-KE1 front view

Full featured K-mount

With K-mount communication contacts, power contacts and AF switch. the LA-KE1 adapter is compatible with K-mount lenses from KAF to KAF4, maximizing the lens compatibility.


Dual built-in motors

LA-KE1 has both built-in aperture motor and screw-drive AF motor, allowing K-mount lenses to achieve auto focus and auto exposure on mirrorless cameras. It can automatically recognize and control traditional mechanical aperture and KAF4 electromagnetic aperture as well as traditional screwdriver focus lens and SDM/DC/PLM motor lens.


 One Piece

Metal integral molding

The main body of LA-KE1 adopts a metal integral molding process to ensure the durability of the adapter.


No bokeh cut

The internal space of the adapter is optimally maximized so that the bokeh won’t be cut when large-aperture lenses are in use.

Note: Uncut(left), with bokeh cut(right). Photo taken with D-FA* Pentax 50mm f1.4 SDM with MonsterAdapter LA-KE1 final version(left) and prototype(right)



Unique Focus Mode Selection switch

For lenses like smc DA* Pentax 200mm f2.8 SDM, they both have an SDM motor and a screwdriver focusing mechanism. The AF drive mode can be selected via this switch in case the SDM motor fails. The position 1 is screwdriver, and the position 2 is SDM.

Note: This switch is only valid for lenses with dual drives.


Lightweight design

Can you imagine this is an adapter with only 96 grams (0.2lb)? Even less than 1/3 of a can of soda. The lightweight design of LA-KE1 will save you the weight of one extra K-mount lens in your backpack.


Upgrade firmware via camera

The adapter firmware will be upgraded through camera body like the same you do with native lenses so there is no USB port on the adapter through which the water and dust may get in.

Supported Camera Models

Click here for detailed supported camera list

    Supported Lenses(Firmware v05):

    Please note: LA-KE1 will continue to expand autofocus support for K-mount lenses through free firmware upgrades. Lenses that are not in the list below cannot be guaranteed for the time being. Stay tuned for follow-up firmware updates.

    支持镜头 / 対応レンズ / Suppoted Lenses
    定焦 / 単焦点レンズ / Prime Lenses
    smc PENTAX-DA 14mm F2.8 ED[IF]
    smc PENTAX-DA 15mm F4 AL Limited
    HD PENTAX-DA 15mm F4 AL Limited
    HD PENTAX-D FA 21mm F2.4 ED Limited DC WR
    smc PENTAX-DA 21mm F3.2 AL Limited
    HD PENTAX-DA 21mm F3.2 ED AL Limited
    smc PENTAX-FA* 24mm F2 AL[IF]
    smc PENTAX-F 28mm F2.8
    smc PENTAX-FA 28mm F2.8 AL
    smc PENTAX-FA SOFT 28mm F2.8 *1, *2
    smc PENTAX-FA 31mm F1.8 AL Limited
    HD PENTAX-FA 31mm F1.8 Limited
    smc PENTAX-FA 35mm F2 AL
    Samsung/Schneider D-XENOGON 35mm F2
    HD PENTAX-FA 35mm F2
    smc PENTAX-DA 35mm F2.4 AL
    smc PENTAX-DA 35mm F2.8 Macro Limited
    HD PENTAX-DA 35mm F2.8 Macro Limited
    smc PENTAX-DA 40mm F2.8 Limited
    HD PENTAX-DA 40mm F2.8 Limited
    smc PENTAX-DA 40mm F2.8 XS
    smc PENTAX-FA 43mm F1.9 Limited
    HD PENTAX-FA 43mm F1.9 Limited
    HD PENTAX-D FA* 50mm F1.4 SDM AW
    smc PENTAX-F 50mm F1.4
    smc PENTAX-FA 50mm F1.4
    HD PENTAX-FA 50mm F1.4
    smc PENTAX-FA 50mm F1.4 Classic
    smc PENTAX-F 50mm F1.7
    smc PENTAX-DA 50mm F1.8
    smc PENTAX-F Macro 50mm F2.8
    smc PENTAX-FA Macro 50mm F2.8
    smc PENTAX-D FA Macro 50mm F2.8
    smc PENTAX-DA* 55mm F1.4 SDM
    smc PENTAX-DA 70mm F2.4 Limited
    HD PENTAX-DA 70mm F2.4 Limited
    smc PENTAX-FA 77mm F1.8 Limited
    HD PENTAX-FA 77mm F1.8 Limited
    smc PENTAX-FA* 85mm F1.4 [IF]
    HD PENTAX-D FA 85mm F1.4 ED SDM AW
    smc PENTAX-FA SOFT 85mm F2.8 *1
    smc PENTAX-F Macro 100mm F2.8
    smc PENTAX-FA Macro 100mm F2.8
    smc PENTAX-D FA Macro 100mm F2.8 WR
    Samsung/Schneider D-XENON 100mm F2.8 Macro
    smc PENTAX-FA Macro 100mm F3.5
    smc PENTAX-FA 135mm F2.8 [IF]
    smc PENTAX-FA* 200mm F2.8 ED[IF]
    smc PENTAX-DA* 200mm F2.8 ED [IF] SDM
    smc PENTAX-FA* 300mm F2.8 ED[IF]
    smc PENTAX-DA* 300mm F4 ED [IF] SDM
    smc PENTAX-F* 300mm F4.5 ED[IF]
    smc PENTAX-FA* 300mm F4.5 ED[IF]
    smc PENTAX-FA* 400mm F5.6 ED[IF]
    HD PENTAX-DA 560mm F5.6 ED AW
    smc PENTAX-FA* 600mm F4 ED[IF]
    变焦镜头 / ズームレンズ / Zoom Lenses
    smc PENTAX-DA FISH-EYE 10-17mm F3.5-4.5 ED[IF]
    Samsung/Schneider D-XENOGON 10-17mm F3.5-4.5 ED FISH-EYE
    HD PENTAX-DA* 11-18mm F2.8 ED DC AW
    HD PENTAX-DA* 16-50mm F2.8 ED PLM AW
    smc PENTAX-DA* 16-50mm F2.8 ED AL [IF] SDM
    smc PENTAX-F FISH-EYE 17-28mm F3.5-4.5
    smc PENTAX-DA 17-70mm F4 AL [IF] SDM
    HD PENTAX-DA 20-40mm F2.8-4 ED Limited DC WR
    smc PENTAX-FA* 28-70mm F2.8 AL
    HD PENTAX-D FA 28-105mm F3.5-5.6 ED DC WR
    smc PENTAX-DA* 50-135mm F2.8 ED [IF] SDM
    HD PENTAX-DA 55-300mm F4.5-6.3 ED PLM WR RE
    smc PENTAX-DA* 60-250mm F4 [IF] SDM
    HD PENTAX-D FA* 70-200mm F2.8 ED DC AW
    HD PENTAX-D FA 70-210mm F4 ED SDM WR
    smc PENTAX-FA* 80-200mm F2.8 ED[IF]
    HD PENTAX-D FA 150-450mm F4.5-5.6 ED DC AW
    附件 / アクセサリー / Accessories
    HD PENTAX-DA 1.4x AW AF Rear Converter *3
    smc PENTAX-F AF Adapter 1.7x *4
    第三方镜头 / サードパーティーレンズ / Third Party Lenses
    Tamron SP AF Aspherical Di LD [IF] 17-35mm F2.8-4
    注意:由于镜头限制,G Driver仅对上述列表中的螺丝刀镜头有效,采用SDM/PLM/DC马达的镜头将继续采用现有算法。如镜头同时含有螺丝刀和SDM马达,则螺丝刀模式可以支持G Driver,而SDM将继续使用现有算法。 / 注:レンズの制限により、G Driverは上記のリストのドライバーレンズにのみ有効であり、SDM / PLM / DCモーターを備えたレンズは引き続き既存のアルゴリズムを使用します。 レンズにドライバーとSDMモーターの両方が含まれている場合、ドライバーモードはGドライバーをサポートでき、SDMは引き続き既存のアルゴリズムを使用します。/ Note: Due to lens limitations, G Driver is only valid for screwdriver lenses in the above list, and lenses with SDM/PLM/DC motors will continue to use the existing algorithm. If the lens contains both a screwdriver and an SDM motor, the screwdriver mode can support G Driver, and SDM will continue to use existing algorithms.
    *1: 自动对焦和机身光圈控制仅在光圈环设定于F4.5-F32之间有效,如果机身设定的光圈值小于光圈环的数值,会造成过曝 / . AFおよびボディ側での絞り調節は、レンズの絞りリングがF4.5〜F32にあるときのみ機能します。 また、ボディ側の絞り値がレンズ側の設定値より⼩さいと露出オーバーになります。 / Auto focus and Aperture adjustments only available when apterture ring sets between f4.5-f32, and you will got over-exposed if camera aperture setting is smaller than aperture ring setting.
    *2: 由于镜头的光学特殊性,自动对焦的精确性不能保证 /  レンズの光学的特性上、AFの精度を保証するものではありません。 / Due to the optical specificity of the lens, the accuracy of autofocus cannot be guaranteed.
    *3: 不自动开启APS-C剪裁模式 / APS-Cモードのクロップは自動的に行われません / No APS-C crop automacitly;使用此增距镜时,更换镜头后可能会导致合焦困难,请取下相机电池再装回去即可解决 / APS-Cクロップモードは⾃動的にオンになりません。また、本リアコンバーターを使⽤する際には、レンズ交換後にカメラのバッテリーを脱着してください。そのまま使⽤するとAFでピントが合いにくい場合があります。 / When using this teleconverter, if you experience focus hunting after changing the lens, please remove the camera battery and put it back in to solve the problem.
    *4: 限A、F、FA、DA及DFA系列镜头,K、M系列镜头不支持 / A, F, FA, DA, DFAシリーズレンズに対応、K, Mシリーズレンズには⾮対応 / For A/F/FA/DA and DFA series lenese only, K and M series lenses are not supported.
    技术原因,暂未支持 / Not Supported Yet Due to Technical Issues
    HD PENTAX-D FA 15-30mm F2.8 ED SDM WR
    HD PENTAX-D FA 24-70mm F2.8 ED SDM WR

    Note: For lenses not in the supported list, their performance cannot be used as the basis for return or exchange.


    1. If the lens is with the aperture ring, it needs to be put on “A” mode to allow the adapter to work properly with AF, otherwise the adapter will only allow MF.
    2. What exactly the PDAF related capabilities are available will depend on the body being used with the adapter. Please refer to the camera manual for detailed information.


    Approximate 80 x 60 x 33mm

    Approximate 96g (0.2lb)

    Included items:
    • Mount adapter LA-KE1 x 1
    • Body cap x 1
    • Rear cap x 1
    • Set of printed documentation

    1 Year

    Shenzhen Muohuan Optics-electrical technology Co., Ltd.

    Shenzhen, China