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

Cheers.