Pentax Optio 33LF vs. Ricoh Caplio R3

Comparison

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Pentax Optio 33LF

Ricoh Caplio R3

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Megapixels

3.10

4.90

Max. image resolution

2048 x 1536

2592 x 1944

Sensor

Sensor type

CCD

Sensor size

1/2.7" (~ 5.33 x 4 mm)

1/2.5" (~ 5.75 x 4.32 mm)

Sensor resolution

2031 x 1527

2552 x 1919

Diagonal

6.66 mm

7.19 mm

Sensor size comparison

Sensor size is generally a good indicator of the quality of the camera. Sensors can vary greatly in size. As a general rule, the bigger the sensor, the better the image quality.

Bigger sensors are more effective because they have more surface area to capture light. An important factor when comparing digital cameras is also camera generation. Generally, newer sensors will outperform the older.

Learn more about sensor sizes »

Actual sensor size

Note: Actual size is set to screen → change »

	vs
1	:	1.17
(ratio)

Pentax Optio 33LF		Ricoh Caplio R3

Surface area:

21.32 mm²

24.84 mm²

Difference: 3.52 mm² (17%)

R3 sensor is approx. 1.17x bigger than 33LF sensor.

Note: You are comparing cameras of different generations. There is a 2 year gap between Pentax 33LF (2003) and Ricoh R3 (2005). All things being equal, newer sensor generations generally outperform the older.

Pixel pitch

2.62 µm

2.25 µm

Pixel pitch tells you the distance from the center of one pixel (photosite) to the center of the next. It tells you how close the pixels are to each other.

The bigger the pixel pitch, the further apart they are and the bigger each pixel is. Bigger pixels tend to have better signal to noise ratio and greater dynamic range.

Difference: 0.37 µm (16%)

Pixel pitch of 33LF is approx. 16% higher than pixel pitch of R3.

Pixel area

6.86 µm²

5.06 µm²

Pixel or photosite area affects how much light per pixel can be gathered. The larger it is the more light can be collected by a single pixel.

Larger pixels have the potential to collect more photons, resulting in greater dynamic range, while smaller pixels provide higher resolutions (more detail) for a given sensor size.

Relative pixel sizes:

Pixel area difference: 1.8 µm² (36%)

A pixel on Pentax 33LF sensor is approx. 36% bigger than a pixel on Ricoh R3.

Pixel density

14.52 MP/cm²

19.7 MP/cm²

Pixel density tells you how many million pixels fit or would fit in one square cm of the sensor.

Higher pixel density means smaller pixels and lower pixel density means larger pixels.

Difference: 5.18 µm (36%)

Ricoh R3 has approx. 36% higher pixel density than Pentax 33LF.

To learn about the accuracy of these numbers, click here.

Specs

Pentax 33LF

Ricoh R3

Crop factor

6.5

6.02

Total megapixels

3.30

5.20

Effective megapixels

3.10

4.90

Optical zoom

7.1x

Digital zoom

Yes

ISO sensitivity

Auto, (100,200,400)

Auto, 64, 100, 200, 400, 800

RAW

Manual focus

Normal focus range

40 cm

30 cm

Macro focus range

10 cm

1 cm

Focal length (35mm equiv.)

38 - 114 mm

28 - 200 mm

Aperture priority

Max. aperture

f2.8 - f5

f3.3 - f4.8

Max. aperture (35mm equiv.)

f18.2 - f32.5

f19.9 - f28.9

Metering

Centre weighted, Multi-segment, Spot

256-segment Matrix, Centre weighted, Spot

Exposure compensation

±2 EV (in 1/3 EV steps)

Shutter priority

Min. shutter speed

2 sec

8 sec

Max. shutter speed

1/2000 sec

Built-in flash

External flash

Viewfinder

Optical (tunnel)

None

White balance presets

Screen size

1.6"

2.5"

Screen resolution

72,000 dots

114,000 dots

Video capture

Max. video resolution

Storage types

MultiMedia, Secure Digital

USB

USB 1.0

HDMI

Wireless

GPS

Battery

AA (2) batteries (NiMH recommended)

Weight

176 g

135 g

Dimensions

109 x 63.5 x 40.5 mm

95 x 26 x 53 mm

Year

2003

2005

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Diagonal

Diagonal is calculated by the use of Pythagorean theorem:

Diagonal = √

w² + h²

where w = sensor width and h = sensor height

Pentax 33LF diagonal

The diagonal of 33LF sensor is not 1/2.7 or 0.37" (9.4 mm) as you might expect, but approximately two thirds of that value - 6.66 mm. If you want to know why, see sensor sizes.

w = 5.33 mm
h = 4.00 mm

Diagonal = √

5.33² + 4.00²

= 6.66 mm

Ricoh R3 diagonal

The diagonal of R3 sensor is not 1/2.5 or 0.4" (10.2 mm) as you might expect, but approximately two thirds of that value - 7.19 mm. If you want to know why, see sensor sizes.

w = 5.75 mm
h = 4.32 mm

Diagonal = √

5.75² + 4.32²

= 7.19 mm

Surface area

Surface area is calculated by multiplying the width and the height of a sensor.

33LF sensor area

Width = 5.33 mm
Height = 4.00 mm

Surface area = 5.33 × 4.00 = 21.32 mm²

R3 sensor area

Width = 5.75 mm
Height = 4.32 mm

Surface area = 5.75 × 4.32 = 24.84 mm²

Pixel pitch

Pixel pitch is the distance from the center of one pixel to the center of the next measured in micrometers (µm). It can be calculated with the following formula:

Pixel pitch =	sensor width in mm	× 1000
	sensor resolution width in pixels

33LF pixel pitch

Sensor width = 5.33 mm
Sensor resolution width = 2031 pixels

Pixel pitch =	5.33	× 1000	= 2.62 µm
	2031

R3 pixel pitch

Sensor width = 5.75 mm
Sensor resolution width = 2552 pixels

Pixel pitch =	5.75	× 1000	= 2.25 µm
	2552

Pixel area

The area of one pixel can be calculated by simply squaring the pixel pitch:

Pixel area = pixel pitch²

You could also divide sensor surface area with effective megapixels:

Pixel area =	sensor surface area in mm²
	effective megapixels

33LF pixel area

Pixel pitch = 2.62 µm

Pixel area = 2.62² = 6.86 µm²

R3 pixel area

Pixel pitch = 2.25 µm

Pixel area = 2.25² = 5.06 µm²

Pixel density

Pixel density can be calculated with the following formula:

Pixel density = (	sensor resolution width in pixels	)² / 1000000
	sensor width in cm

One could also use this formula:

Pixel density =	effective megapixels × 1000000	/ 10000
	sensor surface area in mm²

33LF pixel density

Sensor resolution width = 2031 pixels
Sensor width = 0.533 cm

Pixel density = (2031 / 0.533)² / 1000000 = 14.52 MP/cm²

R3 pixel density

Sensor resolution width = 2552 pixels
Sensor width = 0.575 cm

Pixel density = (2552 / 0.575)² / 1000000 = 19.7 MP/cm²

Sensor resolution

Sensor resolution is calculated from sensor size and effective megapixels. It's slightly higher than maximum (not interpolated) image resolution which is usually stated on camera specifications. Sensor resolution is used in pixel pitch, pixel area, and pixel density formula. For sake of simplicity, we're going to calculate it in 3 stages.

1. First we need to find the ratio between horizontal and vertical length by dividing the former with the latter (aspect ratio). It's usually 1.33 (4:3) or 1.5 (3:2), but not always.

2. With the ratio (r) known we can calculate the X from the formula below, where X is a vertical number of pixels:

(X × r) × X = effective megapixels × 1000000 →

X = √	effective megapixels × 1000000
	r

3. To get sensor resolution we then multiply X with the corresponding ratio:

Resolution horizontal: X × r
Resolution vertical: X

33LF sensor resolution

Sensor width = 5.33 mm
Sensor height = 4.00 mm
Effective megapixels = 3.10

r = 5.33/4.00 = 1.33

X = √	3.10 × 1000000	= 1527
	1.33

Resolution horizontal: X × r = 1527 × 1.33 = 2031
Resolution vertical: X = 1527

Sensor resolution = 2031 x 1527

R3 sensor resolution

Sensor width = 5.75 mm
Sensor height = 4.32 mm
Effective megapixels = 4.90

r = 5.75/4.32 = 1.33

X = √	4.90 × 1000000	= 1919
	1.33

Resolution horizontal: X × r = 1919 × 1.33 = 2552
Resolution vertical: X = 1919

Sensor resolution = 2552 x 1919

Crop factor

Crop factor or focal length multiplier is calculated by dividing the diagonal of 35 mm film (43.27 mm) with the diagonal of the sensor.

Crop factor =	43.27 mm
	sensor diagonal in mm

33LF crop factor

Sensor diagonal in mm = 6.66 mm

Crop factor =	43.27	= 6.5
	6.66

R3 crop factor

Sensor diagonal in mm = 7.19 mm

Crop factor =	43.27	= 6.02
	7.19

35 mm equivalent aperture

Equivalent aperture (in 135 film terms) is calculated by multiplying lens aperture with crop factor (a.k.a. focal length multiplier).

33LF equivalent aperture

Crop factor = 6.5
Aperture = f2.8 - f5

35-mm equivalent aperture = (f2.8 - f5) × 6.5 = f18.2 - f32.5

R3 equivalent aperture

Crop factor = 6.02
Aperture = f3.3 - f4.8

35-mm equivalent aperture = (f3.3 - f4.8) × 6.02 = f19.9 - f28.9

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