This General Brand Lens Adapter allows a Minolta MD (manual focus) type lens to be mounted on a Sony Alpha or Minolta Maxxum SLR body.
Although the lens will fit physically, automatic diaphragm (AE metering), or any other functions are not retained using this adapter. In this case you will need to meter in "stop-down mode" since the lens does not have the ability to have its aperture controlled by the camera body.
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I bought this adapter because I came into some free lenses with the sr mount and wanted to try using them on my minolta maxxum. The product did work well. A lot of people complain it can't do an infinite zoom, and I would say that's partially true. It does struggle to get a perfect focus, it softens the edges a bit, but I would count it as blurry. The adapter itself was easy to use. The lenses detached easily. Unfortunately the end that actually connects to my camera was to snug of a fit. The adapter would not come off. Not a problem if you want to permanently keep the adapter there, but I don't. I ended up taking it to a camera shop for them to emergency unlock it from the inside. So yes, pros and cons.
The adapter contains a removeable lens. The lens is NOT of astronomical quality. I am using this adapter in an astrophotography setup and star images are terrible with the lens installed. Fortunately, the lens is easy to remove. Also, the old Minolta lens does not lock into position. It gets real tight on the adapter before it locks. I can live with this because you can tighten it enough by hand so that it will not accidently unlock.