What are the eight electronic contacts in the bayonet of Canon EOS SLR camera?

I use 600D, which is basically the same as 550D d.

The function of each contact ... try to say it.

In which two drive motors focus.

There is also the transmission of focal length and lens information.

Protection circuit. The rest is unclear.

If the landlord is interested, you can record them one by one to see the reaction.

The difference between full graph and half graph: students are not called half graph, but "residual graph"

The format refers to the photosensitive chip. Take off the lens and look inside the fuselage to see it.

The full-width chip is the same size as the traditional film135 mm.

Half width is smaller, 1.6 times smaller.

Therefore, the equivalent size of a lens with a focal length of 18 is 18* 1.6=24.

The difference is basically in this transformation.

To wake me up by Xiong Haizi's military training downstairs in the morning ... adopt one.