The screw-driven lenses worked mostly as expected. I tested the MonsterAdapter LA-KE1 with the Sony a7R IV and several Pentax lenses from the FA and DA Limited series. For full-frame that's a7 II or newer, and for APS-C the a6100 through a6600 are all supported, but not the a6000 or NEX generation. The LA-KE1 really needs one that supports phase detection focus for adapted lenses to work well. It's not something I see as a real negative, though-a manual Fotodiox adapter works perfectly with older SMC K and M series lenses and costs just $25. You can mount them and use them at an open aperture, but they don't stop down, so the LA-KE1 is for open aperture use only. It's also not a good fit for older lenses without electronic aperture control. For now, you're limited to using it with lenses from the list below. If you're using more recent made-for-digital glass with a DC, PLM, or SDM focus motor, you won't be able to use autofocus, at least not yet-MonsterAdapter promises to update the firmware to expand support to these types of lenses. Pentax's film-era autofocus lenses use this type of focus. With its current firmware, the adapter focuses on lenses that rely on a screw-drive, not those with an internal focus motor. You may find it worthwhile, however, especially if you still use some of your old favorite Pentax glass and want to enjoy the convenience of autofocus. It comes with a premium price, $439 versus $30 or less for a manual alternative.
MonsterAdapter goes a bit further, adding autofocus for screw-driven lenses and electronic aperture control. There's a cottage industry of purely mechanical "dumb" adapters for mirrorless cameras-you can read about them in our guide to adapting lenses. You'll want to make sure to cradle a big lens to support its weight when working handheld, and to use a tripod collar when mounting it. MonsterAdapter recommends you take care when using the adapter with heavier lenses, especially those that weigh more than about 2.2 pounds (1kg). Since that distance is pretty short on a mirrorless camera, an adapter is essentially a light-proof spacer. Lenses are designed to be mounted at a set distance from an image sensor. The adapter itself is a pretty basic concept. It's especially appealing for photographers who've held on to some of Pentax's characterful classic lenses, whether it be a version of the FA 31mm Limited or something rarer, like the FA* 24mm F2. The attention is on Pentax lenses with the LA-KE1, one of the few brands out there without its own mirrorless system or adapter solution.
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