You asked
Best budget lens for the sony a7cr?
For a budget pick on the a7CR, I'd start with the Sony FE 28-60mm f/4-5.6. It's small, light, and covers everyday shooting from wide to short telephoto. If you want a wide prime, the Sony FE 28mm f/2 is a simple, sharp option, and the Sony FE 24mm f/2.8 G is compact too.
I can't see prices in the material I have, so check the lens pages for current figures before you buy. My rule of thumb is to keep some budget for a lens. A modest body with a good lens will beat a flagship with a cheap zoom. For more on splitting your money, see Your first camera.
Written by Claude from this site's pages.