Nikon Coolpix A1000 vs. Nikon Coolpix P7100

Comparison

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Coolpix A1000 image
vs
Coolpix P7100 image
Nikon Coolpix A1000 Nikon Coolpix P7100
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Megapixels
16.00
10.10
Max. image resolution
4608 x 3456
3648 x 2736

Sensor

Sensor type
CMOS
CCD
Sensor size
1/2.3" (~ 6.16 x 4.62 mm)
1/1.7" (~ 7.53 x 5.64 mm)
Sensor resolution
4612 x 3468
3678 x 2745
Diagonal
7.70 mm
9.41 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 : 1.49
(ratio)
Nikon Coolpix A1000 Nikon Coolpix P7100
Surface area:
28.46 mm² vs 42.47 mm²
Difference: 14.01 mm² (49%)
P7100 sensor is approx. 1.49x bigger than A1000 sensor.
Note: You are comparing sensors of very different generations. There is a gap of 8 years between Nikon A1000 (2019) and Nikon P7100 (2011). 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
1.34 µm
2.05 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: 0.71 µm (53%)
Pixel pitch of P7100 is approx. 53% higher than pixel pitch of A1000.
Pixel area
1.8 µm²
4.2 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: 2.4 µm² (133%)
A pixel on Nikon P7100 sensor is approx. 133% bigger than a pixel on Nikon A1000.
Pixel density
56.06 MP/cm²
23.86 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: 32.2 µm (135%)
Nikon A1000 has approx. 135% higher pixel density than Nikon P7100.
To learn about the accuracy of these numbers, click here.



Specs

Nikon A1000
Nikon P7100
Crop factor
5.62
4.6
Total megapixels
16.79
10.40
Effective megapixels
16.00
10.10
Optical zoom
35x
7.1x
Digital zoom
Yes
Yes
ISO sensitivity
Auto, 100-6400
Auto, 100 - 1600
RAW
Manual focus
Normal focus range
50 cm
50 cm
Macro focus range
1 cm
2 cm
Focal length (35mm equiv.)
24 - 840 mm
28 - 200 mm
Aperture priority
Yes
Yes
Max. aperture
f3.4 - f6.9
f2.8 - f5.6
Max. aperture (35mm equiv.)
f19.1 - f38.8
f12.9 - f25.8
Metering
Multi, Center-weighted, Spot
Centre weighted, Matrix, Spot
Exposure compensation
±3 EV (in 1/3 EV steps)
±2 EV (in 1/3 EV steps)
Shutter priority
Yes
Yes
Min. shutter speed
8 sec
60 sec
Max. shutter speed
1/4000 sec
1/4000 sec
Built-in flash
External flash
Viewfinder
Electronic
Optical (tunnel)
White balance presets
5
6
Screen size
3"
3"
Screen resolution
1,036,000 dots
921,000 dots
Video capture
Max. video resolution
3840x2160 (30p/25p)
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
EN-EL12 lithium-ion battery
DC 7.4 V, 1030 mAh
Weight
330 g
395 g
Dimensions
114.2 x 71.7 x 40.5 mm
114 x 77 x 45 mm
Year
2019
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 A1000 diagonal

The diagonal of A1000 sensor is not 1/2.3 or 0.43" (11 mm) as you might expect, but approximately two thirds of that value - 7.7 mm. If you want to know why, see sensor sizes.

w = 6.16 mm
h = 4.62 mm
Diagonal =  6.16² + 4.62²   = 7.70 mm

Nikon P7100 diagonal

The diagonal of P7100 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


Surface area

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

A1000 sensor area

Width = 6.16 mm
Height = 4.62 mm

Surface area = 6.16 × 4.62 = 28.46 mm²

P7100 sensor area

Width = 7.53 mm
Height = 5.64 mm

Surface area = 7.53 × 5.64 = 42.47 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

A1000 pixel pitch

Sensor width = 6.16 mm
Sensor resolution width = 4612 pixels
Pixel pitch =   6.16  × 1000  = 1.34 µm
4612

P7100 pixel pitch

Sensor width = 7.53 mm
Sensor resolution width = 3678 pixels
Pixel pitch =   7.53  × 1000  = 2.05 µm
3678


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

A1000 pixel area

Pixel pitch = 1.34 µm

Pixel area = 1.34² = 1.8 µm²

P7100 pixel area

Pixel pitch = 2.05 µm

Pixel area = 2.05² = 4.2 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

A1000 pixel density

Sensor resolution width = 4612 pixels
Sensor width = 0.616 cm

Pixel density = (4612 / 0.616)² / 1000000 = 56.06 MP/cm²

P7100 pixel density

Sensor resolution width = 3678 pixels
Sensor width = 0.753 cm

Pixel density = (3678 / 0.753)² / 1000000 = 23.86 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

A1000 sensor resolution

Sensor width = 6.16 mm
Sensor height = 4.62 mm
Effective megapixels = 16.00
r = 6.16/4.62 = 1.33
X =  16.00 × 1000000  = 3468
1.33
Resolution horizontal: X × r = 3468 × 1.33 = 4612
Resolution vertical: X = 3468

Sensor resolution = 4612 x 3468

P7100 sensor resolution

Sensor width = 7.53 mm
Sensor height = 5.64 mm
Effective megapixels = 10.10
r = 7.53/5.64 = 1.34
X =  10.10 × 1000000  = 2745
1.34
Resolution horizontal: X × r = 2745 × 1.34 = 3678
Resolution vertical: X = 2745

Sensor resolution = 3678 x 2745


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


A1000 crop factor

Sensor diagonal in mm = 7.70 mm
Crop factor =   43.27  = 5.62
7.70

P7100 crop factor

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

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).

A1000 equivalent aperture

Crop factor = 5.62
Aperture = f3.4 - f6.9

35-mm equivalent aperture = (f3.4 - f6.9) × 5.62 = f19.1 - f38.8

P7100 equivalent aperture

Crop factor = 4.6
Aperture = f2.8 - f5.6

35-mm equivalent aperture = (f2.8 - f5.6) × 4.6 = f12.9 - f25.8

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