N00b, Rebel T7 + old 50mm prime

N6GQ wrote:

I've tried a few things...

If I slide the MF/AF switch to MF, it may shoot a shot. Moving it back to AF and it might shoot one more or not. Then it errors with ERR01. So I clean the contacts, still doesn't work.

I tried turning the lens ever so slightly off the locked position on the body, still same.

Going back to other lenses, they work fine.

If you clean the contacts well, it should not have the ERR01. I would try to sand the contacts of the lens just a little, to make sure that it's not any dirt or crust.

If it still doesn't work, probably it's the contacts on the lens themselves that doesn't work. You then have three options: get it fixed, buy a new canon STM or buy the Yongnuo version of it.

For the price and quality, I would try to fix myself the lens (since it's already gone, anyway), and, if it wasn't something simple, just toss it away. Then, if I had the cash I would buy the STM, if not, Youngnuo has two versions of it, and the cheapest (from reviews) compares to the one you have now, the second version should be a little better, but both are marginally worse than the STM.

Check your budget and make your choice...

PS: The first prime lens I bought was the 50mm, and makes awesome bokehs, but I found the 24mm STM a far more usable lens, from landscapes to portraits, it can make it all, with sharp definition and awesome colors. If I was to chose only one of them, I would keep the 24mm...