Minolta Maxxum 9000 - Lens Care and Handling

4. Principle of auto focusing
(1) Light path
‘The light from taking lens passes through main mirror
half micror. reflects on sub mirror, and strikes on AF
sensor.
AF sensor is composed with optics! elements IR cut
filter. condenser lens. separating lens ete, and CCD
image sensor.
'2) AF sensor
A searatirg ens
Tang ens Eanenent cont 10
fim
sare
—
consenser
lens
Separating lens 15 composed with 2 extremely small lenses lined side by side, The image. formed
by taking lens. is separated into wo images sin right and left and formed on CCD image sensor
by separating lens.
*CCD image sensor sequentially outputs electric charge of each picture element, as phase difference
signal of 2 images, to IC. through IC.
9 —Camanson tek feterence voor 4 Phase differance detection system detects focusing
state comparing positions of 2 images.
ZA V2 Comparison block is cumposed with more picture
pa Sen a
elements than reference block so that comparison
Seoarated rages on reference
Seow block can detect focus amount and defocus direction,