1, biscuit head: The maximum aperture of biscuit head is usually only F2.4-2.8.

2. Small spittoon: The maximum diameter of small spittoon is F 1.8, and the minimum diameter is F22.

Second, the advantages are different:

1, cookie head: small, so that the whole lens can be easily put into the pocket; Fast, focusing speed is incomparable with zoom head; The "fast" large aperture makes the shutter speed much faster, and the ability to capture moments is also good.

2, small spittoon: cheap, good image quality, large aperture, attractive blurred background, sharp imaging, cheap, lightweight, high resolution, natural color.

Third, the disadvantages are different.

1, biscuit head: In order to pursue the ultimate compact size, we will sacrifice the size ratio of the maximum aperture and even the image quality of the lens.

2, small spittoon: the material is general, the plastic bayonet focusing motor is too violent, and the caliber and appearance are not good enough.

Baidu encyclopedia-biscuit head

Baidu encyclopedia-small spittoon