
Sony’s lens adapter adds a mirror to mirrorless cameras
Yet another leaked new product from Sony, and yet another new lens adapter, only this time one with a twist. Or rather, one with a mirror.
The LA-EA2 lets you put Sony’s big Alpha SLR lenses onto smaller NEX cameras. This usually entails little more than making a tube with the correct fittings for lans and body. Sony’s smart take is to put a translucent mirror in there to skim a little bit of light from the image traveling to the camera. This is then sent to a phase-detection autofocus sensor in the base.
Thus, you get fast, SLR-speed focussing with a tiny, mirrorless camera. Usually the contrast-detection AF used in mirrorless cameras is pretty slow in comparison, especially when using lenses not designed with it in mind. And sure, technically the camera isn’t “mirrorless” anymore, but that’s just being picky.
This kind of mirror, called a “pellicle” mirror and used in cameras from the 1960s, is the same kind as Sony already uses in its A33 and A55 bodies, so it has been tried and tested. It’s certainly a very smart idea to put this into a lens adapter. It seems so obvious now we’ve seen it.
Sony will release also a NEX adapter LA-EA2 for A-mount lenses [Photo Rumors via Photography Bay]


