Olympus D-40 Zoom vs. Panasonic Lumix DMC-GH1

Comparison

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D-40 Zoom image
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Lumix DMC-GH1 image
Olympus D-40 Zoom Panasonic Lumix DMC-GH1
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Megapixels
3.90
12.10
Max. image resolution
2272 x 1704
4000 x 3000

Sensor

Sensor type
CCD
CMOS
Sensor size
1/1.8" (~ 7.11 x 5.33 mm)
Four Thirds (17.3 x 13 mm)
Sensor resolution
2277 x 1712
4011 x 3016
Diagonal
8.89 mm
21.64 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 : 5.93
(ratio)
Olympus D-40 Zoom Panasonic Lumix DMC-GH1
Surface area:
37.90 mm² vs 224.90 mm²
Difference: 187 mm² (493%)
GH1 sensor is approx. 5.93x bigger than D-40 Zoom sensor.
Note: You are comparing sensors of very different generations. There is a gap of 8 years between Olympus D-40 Zoom (2001) and Panasonic GH1 (2009). Eight years is a lot of time in terms of technology, meaning newer sensors are overall much more efficient than the older ones.
Pixel pitch
3.12 µm
4.31 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: 1.19 µm (38%)
Pixel pitch of GH1 is approx. 38% higher than pixel pitch of D-40 Zoom.
Pixel area
9.73 µm²
18.58 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:
vs
Pixel area difference: 8.85 µm² (91%)
A pixel on Panasonic GH1 sensor is approx. 91% bigger than a pixel on Olympus D-40 Zoom.
Pixel density
10.26 MP/cm²
5.38 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: 4.88 µm (91%)
Olympus D-40 Zoom has approx. 91% higher pixel density than Panasonic GH1.
To learn about the accuracy of these numbers, click here.



Specs

Olympus D-40 Zoom
Panasonic GH1
Crop factor
4.87
2
Total megapixels
4.10
14.00
Effective megapixels
3.90
12.10
Optical zoom
2.8x
Digital zoom
Yes
Yes
ISO sensitivity
100, 200, 400
Auto, 100, 200, 400, 800, 1600, 3200
RAW
Manual focus
Normal focus range
80 cm
Macro focus range
10 cm
Focal length (35mm equiv.)
35 - 98 mm
Aperture priority
Yes
Yes
Max. aperture
f2.8 - f4.8
Max. aperture (35mm equiv.)
f13.6 - f23.4
n/a
Metering
Multi, Center-weighted, Spot
Centre weighted, Intelligent Multiple, Spot
Exposure compensation
±2 EV (in 1/3 EV steps)
±3 EV (in 1/3 EV steps)
Shutter priority
Yes
Yes
Min. shutter speed
16 sec
Bulb+60 sec
Max. shutter speed
1/1000 sec
1/4000 sec
Built-in flash
External flash
Viewfinder
Optical (tunnel)
Electronic
White balance presets
5
6
Screen size
1.5"
3"
Screen resolution
114,000 dots
460,000 dots
Video capture
Max. video resolution
Storage types
SmartMedia
SDHC, Secure Digital
USB
USB 1.0
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
AA (2) batteries (NiMH recommended)
Lithium-Ion rechargeable battery
Weight
270 g
385 g
Dimensions
87 x 69 x 44 mm
124 x 89.6 x 45.2 mm
Year
2001
2009




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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

Olympus D-40 Zoom diagonal

The diagonal of D-40 Zoom sensor is not 1/1.8 or 0.56" (14.1 mm) as you might expect, but approximately two thirds of that value - 8.89 mm. If you want to know why, see sensor sizes.

w = 7.11 mm
h = 5.33 mm
Diagonal =  7.11² + 5.33²   = 8.89 mm

Panasonic GH1 diagonal

w = 17.30 mm
h = 13.00 mm
Diagonal =  17.30² + 13.00²   = 21.64 mm


Surface area

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

D-40 Zoom sensor area

Width = 7.11 mm
Height = 5.33 mm

Surface area = 7.11 × 5.33 = 37.90 mm²

GH1 sensor area

Width = 17.30 mm
Height = 13.00 mm

Surface area = 17.30 × 13.00 = 224.90 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

D-40 Zoom pixel pitch

Sensor width = 7.11 mm
Sensor resolution width = 2277 pixels
Pixel pitch =   7.11  × 1000  = 3.12 µm
2277

GH1 pixel pitch

Sensor width = 17.30 mm
Sensor resolution width = 4011 pixels
Pixel pitch =   17.30  × 1000  = 4.31 µm
4011


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

D-40 Zoom pixel area

Pixel pitch = 3.12 µm

Pixel area = 3.12² = 9.73 µm²

GH1 pixel area

Pixel pitch = 4.31 µm

Pixel area = 4.31² = 18.58 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

D-40 Zoom pixel density

Sensor resolution width = 2277 pixels
Sensor width = 0.711 cm

Pixel density = (2277 / 0.711)² / 1000000 = 10.26 MP/cm²

GH1 pixel density

Sensor resolution width = 4011 pixels
Sensor width = 1.73 cm

Pixel density = (4011 / 1.73)² / 1000000 = 5.38 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

D-40 Zoom sensor resolution

Sensor width = 7.11 mm
Sensor height = 5.33 mm
Effective megapixels = 3.90
r = 7.11/5.33 = 1.33
X =  3.90 × 1000000  = 1712
1.33
Resolution horizontal: X × r = 1712 × 1.33 = 2277
Resolution vertical: X = 1712

Sensor resolution = 2277 x 1712

GH1 sensor resolution

Sensor width = 17.30 mm
Sensor height = 13.00 mm
Effective megapixels = 12.10
r = 17.30/13.00 = 1.33
X =  12.10 × 1000000  = 3016
1.33
Resolution horizontal: X × r = 3016 × 1.33 = 4011
Resolution vertical: X = 3016

Sensor resolution = 4011 x 3016


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


D-40 Zoom crop factor

Sensor diagonal in mm = 8.89 mm
Crop factor =   43.27  = 4.87
8.89

GH1 crop factor

Sensor diagonal in mm = 21.64 mm
Crop factor =   43.27  = 2
21.64

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).

D-40 Zoom equivalent aperture

Crop factor = 4.87
Aperture = f2.8 - f4.8

35-mm equivalent aperture = (f2.8 - f4.8) × 4.87 = f13.6 - f23.4

GH1 equivalent aperture

Aperture is a lens characteristic, so it's calculated only for fixed lens cameras. If you want to know the equivalent aperture for Panasonic GH1, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Panasonic GH1 is 2

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