You can trace Sony’s roots directly back to Minolta Maxxum. But going back further leads to some excellent Minolta MD Rokkor manual focus glass. Here are three adapters that allow you to mount Minolta MD lenses to Sony E-mount mirrorless cameras including fullframe Sony a7 Series cameras. All adapters listed here will focus to infinity.
FotodioX Adapter for Minolta MD/MC to Sony E-Mount ($60 at B&H | Amazon) This adapter allows you to mount a Minolta MD/MC/SR Rokkor Mount lens to Sony E-mount cameras. Automatic diaphragm will not operate correctly while using this adapter, so Manual or aperture priority mode must be used when this adapter is attached.
Its all-metal design of brass with stainless steel finishing and polished surface provide smooth mounting and long lasting performance. The leaf spring design in the adapter holds the lens tight to the camera body ensuring there is no play between the camera and the lens. The adapter also has a removable tripod mount to help bear the weight of heavier lenses.
Novoflex Adapter for Minolta MD or MC Lens to Sony E-Mount ($212 at B&H | Amazon) is a pricier option that does the same thing – think Seiko -vs- Rolex. It allows you to mount a Minolta MD or Minolta MC lens to Sony E-Mount camera with a precision mechanical adapter. The adapter does not transfer functions from the camera to the lens, such as auto focus, but automatic exposure metering (stop-down metering/aperture priority) is possible.
FotodioX Vizelex ND Throttle Adapter for Minolta MD Lenses ($100 at B&H | Amazon) This Fotodiox adapter features a built-in 10-stop variable neutral density filter to control the amount of light entering the camera which enables shooting in bright daylight while still using wide apertures for shallow depth of field. It also helps with fast exposure adjustments when going from bright to low light. A bright blue metal ring manually adjusts the filter from ND2-ND1000.