EOS 20D Instruction Manual
Page 68
... sensitive or vertical-line sensitive. 68 AF-Assist beam with lenses whose maximum aperture is possible. Lens' Maximum Aperture and AF Sensitivity The EOS 20D will go in flash fires a brief burst of flashes when you turn the dial, the selection will execute high-precision AF with the Built-in Flash Under...
... sensitive or vertical-line sensitive. 68 AF-Assist beam with lenses whose maximum aperture is possible. Lens' Maximum Aperture and AF Sensitivity The EOS 20D will go in flash fires a brief burst of flashes when you turn the dial, the selection will execute high-precision AF with the Built-in Flash Under...