Nikon Coolpix P7800 vs. Nikon 1 J1

Comparison

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Coolpix P7800 image
vs
1 J1 image
Nikon Coolpix P7800 Nikon 1 J1
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Megapixels
12.20
10.10
Max. image resolution
4000 x 3000
3872 x 2592

Sensor

Sensor type
CMOS
CMOS
Sensor size
1/1.7" (~ 7.53 x 5.64 mm)
13.2 x 8.8 mm
Sensor resolution
4043 x 3017
3893 x 2595
Diagonal
9.41 mm
15.86 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 : 2.74
(ratio)
Nikon Coolpix P7800 Nikon 1 J1
Surface area:
42.47 mm² vs 116.16 mm²
Difference: 73.69 mm² (174%)
1 J1 sensor is approx. 2.74x bigger than P7800 sensor.
Note: You are comparing cameras of different generations. There is a 2 year gap between Nikon P7800 (2013) and Nikon 1 J1 (2011). All things being equal, newer sensor generations generally outperform the older.
Pixel pitch
1.86 µm
3.39 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: 1.53 µm (82%)
Pixel pitch of 1 J1 is approx. 82% higher than pixel pitch of P7800.
Pixel area
3.46 µm²
11.49 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: 8.03 µm² (232%)
A pixel on Nikon 1 J1 sensor is approx. 232% bigger than a pixel on Nikon P7800.
Pixel density
28.83 MP/cm²
8.7 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: 20.13 µm (231%)
Nikon P7800 has approx. 231% higher pixel density than Nikon 1 J1.
To learn about the accuracy of these numbers, click here.

Specs

Nikon P7800
Nikon 1 J1
Crop factor
4.6
2.73
Total megapixels
12.80
12.00
Effective megapixels
12.20
10.10
Optical zoom
7.1x
Digital zoom
Yes
No
ISO sensitivity
80, 100, 200, 400, 800, 1600, (3200 and Hi 1=6400)
100 - 3200, 6400
RAW
Manual focus
Normal focus range
50 cm
Macro focus range
2 cm
Focal length (35mm equiv.)
28 - 200 mm
Aperture priority
Yes
Yes
Max. aperture
f2.0 - f4.0
Max. aperture (35mm equiv.)
f9.2 - f18.4
n/a
Metering
Multi, Center-weighted, Spot
Centre weighted, Matrix, Spot
Exposure compensation
±3 EV (in 1/3 EV steps)
±3 EV (in 1/3 EV steps)
Shutter priority
Yes
Yes
Min. shutter speed
60 sec
30 sec
Max. shutter speed
1/4000 sec
1/16000 sec
Built-in flash
External flash
Viewfinder
Electronic
None
White balance presets
7
6
Screen size
3"
3"
Screen resolution
921,000 dots
460,000 dots
Video capture
Max. video resolution
Storage types
SD/SDHC/SDXC
SDHC, SDXC, Secure Digital
USB
USB 2.0 (480 Mbit/sec)
USB 2.0 (480 Mbit/sec)
HDMI
Wireless
GPS
Battery
Nikon EN-EL14 Lithium-Ion
Lithium-Ion EN-EL20 rechargeable battery
Weight
399 g
234 g
Dimensions
118.5 x 77.5 x 50.4 mm
106 x 61 x 29.8 mm
Year
2013
2011



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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

Nikon P7800 diagonal

The diagonal of P7800 sensor is not 1/1.7 or 0.59" (14.9 mm) as you might expect, but approximately two thirds of that value - 9.41 mm. If you want to know why, see sensor sizes.

w = 7.53 mm
h = 5.64 mm
Diagonal =  7.53² + 5.64²   = 9.41 mm

Nikon 1 J1 diagonal

w = 13.20 mm
h = 8.80 mm
Diagonal =  13.20² + 8.80²   = 15.86 mm


Surface area

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

P7800 sensor area

Width = 7.53 mm
Height = 5.64 mm

Surface area = 7.53 × 5.64 = 42.47 mm²

1 J1 sensor area

Width = 13.20 mm
Height = 8.80 mm

Surface area = 13.20 × 8.80 = 116.16 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

P7800 pixel pitch

Sensor width = 7.53 mm
Sensor resolution width = 4043 pixels
Pixel pitch =   7.53  × 1000  = 1.86 µm
4043

1 J1 pixel pitch

Sensor width = 13.20 mm
Sensor resolution width = 3893 pixels
Pixel pitch =   13.20  × 1000  = 3.39 µm
3893


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

P7800 pixel area

Pixel pitch = 1.86 µm

Pixel area = 1.86² = 3.46 µm²

1 J1 pixel area

Pixel pitch = 3.39 µm

Pixel area = 3.39² = 11.49 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

P7800 pixel density

Sensor resolution width = 4043 pixels
Sensor width = 0.753 cm

Pixel density = (4043 / 0.753)² / 1000000 = 28.83 MP/cm²

1 J1 pixel density

Sensor resolution width = 3893 pixels
Sensor width = 1.32 cm

Pixel density = (3893 / 1.32)² / 1000000 = 8.7 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

P7800 sensor resolution

Sensor width = 7.53 mm
Sensor height = 5.64 mm
Effective megapixels = 12.20
r = 7.53/5.64 = 1.34
X =  12.20 × 1000000  = 3017
1.34
Resolution horizontal: X × r = 3017 × 1.34 = 4043
Resolution vertical: X = 3017

Sensor resolution = 4043 x 3017

1 J1 sensor resolution

Sensor width = 13.20 mm
Sensor height = 8.80 mm
Effective megapixels = 10.10
r = 13.20/8.80 = 1.5
X =  10.10 × 1000000  = 2595
1.5
Resolution horizontal: X × r = 2595 × 1.5 = 3893
Resolution vertical: X = 2595

Sensor resolution = 3893 x 2595


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


P7800 crop factor

Sensor diagonal in mm = 9.41 mm
Crop factor =   43.27  = 4.6
9.41

1 J1 crop factor

Sensor diagonal in mm = 15.86 mm
Crop factor =   43.27  = 2.73
15.86

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).

P7800 equivalent aperture

Crop factor = 4.6
Aperture = f2.0 - f4.0

35-mm equivalent aperture = (f2.0 - f4.0) × 4.6 = f9.2 - f18.4

1 J1 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 Nikon 1 J1, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Nikon 1 J1 is 2.73

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