Everything in sight, except lenses and membrane blades is plastic, including the mount. There's no five-axis stabilization in the Sony FE Series II, as the lens doesn't report focus distance. As such, you'll need to be prepared for three-axis stabilization when entering focus into the camera's SteadyShot options. As is usual with this type of lens, we won't find a diaphragm ring or manual mechanical focus, which is what else we wish for. That is, its weight of less than 90 grams and its length of just over 3 cm put it in the record category. Entire bag. Minimalist design that doesn't offend anyone. It doesn't sound on my A7R II when focusing and does it right and fast. Support AF with manual focus by increasing focus range x5 when we enable DMF function in camera focus modes. There is no slag, it fits well, everything is going smoothly. In terms of image quality, it rubs or goes into the “A”. Sharpness and detail at virtually every aperture, great color and contrast, I've turned on Distortion, Vignetting and AC options on the camera and the truth is I can't tell you. Great buy for this price. A vintage manual can be four or five times cheaper if you don't need AF, but forget about the same color and performance. Those aspheric lenses aren't there for nothing, nor does the optical design have anything to do with the ones from a few years ago, that the rear lens is larger than the front for some reason... It's one thing when you're fed up with it, to see high-resolution samples, and another to get them directly. It's hard to go wrong with that goal.