Canon eos5d User Manual download pdf (Page 23)

EOS 40D

Photodiode

EOS 50D

EOS 50D Gapless Microlenses

Several optical and electronic technology advancements

debut in the EOS 50D’s CMOS sensor. For starters, a

new micro manufacturing process was used in the

CMOS semiconductor production phase to increase the

light-sensitive photodiode area. Above the photodiode,

gapless microlenses improve the light-gathering efficiency

of the smaller 4.7µm pixels and help achieve high ISO

speeds (standard range from ISO 100 to 3200, with

expanded 6400 or 12,800 ISO settings possible) plus

lower noise images than on the EOS 40D.

Next, improved 4-channel data reading from each line on

the sensor paired with a new high-speed, low-voltage amp

increases the signal speed by about 1.5x over the EOS 40D’s

sensor, helping to maintain a fast 6.3 fps burst rate despite

the higher amounts of data coming from the sensor’s 15.1

megapixels. Power consumption is also reduced.

In front of the CMOS imaging surface and micro-mirror array is a protective infrared and

low-pass filter array that is similar in design to the one found on the EOS 40D. However,

as on the EOS 5D Mark II, Canon has added a dust-repelling fluorine coating to the front

surface of the first low pass filter and moved the infrared blocking, dichroic coating to the

back side of that filter.

Both new EOS DSLRs rely on the incredible speed, advanced image-processing capabilities,

and lower power consumption provided by Canon’s DIGIC 4 Image Processor. The major

advances and features it provides over the DIGIC III Image Processor in the EOS 40D or

older DIGIC II Image Processor found in the EOS 5D include:

1) Low noise image development, allowing for better noise reduction at all ISOs and 2

stops higher normal ISO speed in the EOS 5D Mark II.

IV. PERFORMANCE AND RELIABILITY

DIGIC 4 and 14-Bit A/D

Conversion

4. Low-pass filter -2

(Separates image

in vertical direction)

1. Low-pass filter -1

(Separates image

in horizontal direction)

2. Phaser layer

(Converts linear polarized

light into circular polarized light)

CMOS

sensor

Dichroic mirror

(Reflects infrared rays)

3. Infrared-absorbing glass

Infrared, Low-Pass Filter

Construction

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