Reddit reviews Meike Automatic Extension Tube for Sony E-Mount NEX-7 NEX-6 NEX-5R NEX-3N NEX-F3 NEX-5N NEX-5C NEX-C3

I'd recommend these:

https://www.amazon.com/Meike-Automatic-Extension-Mount-NEX-5R/dp/B00BXZ9ALQ

Meike Automatic Extension Tubes work great and the AF remains good. I use them on my A6500 as well as my A7R and the results are fantastic.

Now, that said, I do have and use actual medical/military lenses dedicated and made for macro work as well. There is a noticeable difference in quality BUT for the average person and even most photographers, the difference is negligible, especially considering the price differences.

If you want to test out macro buy some cheap extension tubes. They will let you focus closer but with some light loss

https://www.amazon.com/dp/B00BXZ9ALQ/

Yep, super cheap too; https://www.amazon.com/dp/B00BXZ9ALQ/

Interesting choice of lens, don't see too many adapted FD lenses on Sony bodies. Have you considered a cheap set of macro tubes? These look good.

It depends on the ones you buy, maybe. Look for the metal connectors like these and you should still have autofocus... https://www.amazon.com/Meike-Automatic-Extension-E-Mount-NEX-5R/dp/B00BXZ9ALQ

If you want the ultimate budget option, consider Meike macro extender tubes for e mount. The plastic tubes reduce the minimum focal distance of any lens by attaching between the lens and the body. This effectively turns any lens you already own into a macro lens. When I first started buying gear, I used a vintage Canon FD 50mm with FD-to-E adapter, and these extender tubes. The whole setup cost < $40, and it took beautiful macro shots for wedding rings, insects, etc.