Does Canon choose 24-70 or 16-35 as the first head? How to choose fixed focus? Choose 85 or 50?

16-35 (a little wasteful) is used for frame knives, and 24-70 is used for whole frame knives. At the beginning of learning photography, it is very important to cover the focal length, because the main thing is to practice composition and concentrate after learning composition well. To further study the application of light and shadow, it is of course best to focus on 50 mm to 135 mm for portrait shooting, which is enough for frame knife, and the whole frame knife is 85.

There is also a non-mainstream play, which is how I practice. I used a medieval lens, which is a manual lens, for three reasons.

On the one hand, medieval lenses are much cheaper and cheaper than modern lenses.

Both medieval lenses are basically fixed-focus lenses with sufficient materials. They are all iron bumps, and the imaging is not as good as modern low-end electronic lenses.

The lenses of all three are manual pan/tilt, and the aperture and focal length are manually adjusted, including how to connect to the digital body.

You need to learn and practice a lot of photography knowledge before you can use it, which is a good training for practicing photography skills and mastering photography related knowledge.

Medieval lens brands, such as East Zeiss, West Zeiss, Fu Lunda, Meyer, Kangtaishi, Pantaikang, Schneider, etc., and other small Japanese old lenses, such as Takamura, don't buy them. Some FD/FL ports of Canon are a bit tricky, but the transfer is too difficult. If you are interested, study it yourself slowly.