I'm looking into getting a 35mm lense prime lense for my 80d. I have the EF 50mm stm lense and I love it, but sometimes the autofocus is not sharp enough. Also with the crop factor it's too zoomed for certain scenarios. What would be a good lense too look into with a $500 budget? I was looking into the Rokinon 35mm cinema lense because I'm trying to get more into videography too. I'm opened for used lenses!