Minolta MD 24mm can be easily used on Sony a7, thanks for the adapters. Adapter represents simple piece of metal — metal tube which is attached to the lens.
Size comparison of Minolta MD 24mm equipped with MD-NEX adapter with Sony SEL2870.
You can check price for Minolta MD 24mm: eBay.com or eBay.de
Buy on BHPhoto: Sony a7, Sony a7r II
Buy on Amazon: Sony a7, Sony a7r II