Photography can't afford it.

I am also a student, hehe. I also used telephoto lens to get started, but to be honest, it didn't work very well. I suggest you go directly to the entry SLR. Now Sony's A290 is only 2999, which is very suitable for getting started. Or you can buy second-hand Nikon D3 100 and Canon 500D. Telefocus is just a familiar process. In fact, reading a book or soaking in a physical store is no problem. After all, the picture quality of SLR is not as good as telephoto. If you have to go to telephoto, I recommend going to Fuji S205. You can focus manually, but it's out of business. Second, the price of mobile phone 1500-2000, the photosensitive element is larger than the ordinary card machine, and the lens diameter is larger. Imaging is natural. The book recommended by every photographer is the New York Institute of Photography, which has benefited a lot. However, it is not recommended to use telephoto to get started, or to use the entry SLR directly, which only represents my personal opinion and I hope to adopt it.