Nikon D1 vs. Nikon D7100

vs. 


Nikon D1  Nikon D7100  
Megapixels

2.60  24.10  
Max. resolution

2000 x 1312  6000 x 4000  
Price

Amazon, B&H Photo, Adorama  Amazon, B&H Photo, Adorama  
Sensor 

Sensor type

CCD  CMOS  
Sensor size

23.7 x 15.5 mm  23.5 x 15.6 mm  
Sensor resolution

1995 x 1304  6032 x 3995  
Diagonal

28.32 mm  28.21 mm  
Surface area

367.35 mm²  366.60 mm²  
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 sizes:
Surface area:
Nikon D1 has approx. 0.2% more surface area than Nikon D7100.
Note: You are comparing sensors of vastly different generations.
There is a gap of 14 years between Nikon D1 (1999) and
Nikon D7100 (2013).
Fourteen years is a huge amount of time,
technology wise, resulting in newer sensor being much more
efficient than the older one.


Pixel pitch

11.88 µm  3.9 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. 
Pixel pitch
Pixel pitch of Nikon D1 is approx. 205% higher than pixel pitch of Nikon D7100.


Pixel area

141.13 µm²  15.21 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:
A pixel on Nikon D1 sensor is approx. 828% bigger than a pixel on Nikon D7100.


Pixel density

0.71 MP/cm²  6.59 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. 
Pixel density
Nikon D7100 has approx. 828% higher pixel density than Nikon D1.

To learn about the accuracy of these numbers,
click here.
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Diagonal
Diagonal is calculated by the use of Pythagorean theorem:
where w = sensor width and h = sensor height
Diagonal = √  w² + h² 
Nikon D1 diagonal
w = 23.70 mm
h = 15.50 mm
h = 15.50 mm
Diagonal = √  23.70² + 15.50²  = 28.32 mm 
Nikon D7100 diagonal
w = 23.50 mm
h = 15.60 mm
h = 15.60 mm
Diagonal = √  23.50² + 15.60²  = 28.21 mm 
Surface area
Surface area is calculated by multiplying the width and the height of a sensor.
Nikon D1 surface area
Width = 23.70 mm
Height = 15.50 mm
Surface area = 23.70 × 15.50 = 367.35 mm²
Height = 15.50 mm
Surface area = 23.70 × 15.50 = 367.35 mm²
Nikon D7100 surface area
Width = 23.50 mm
Height = 15.60 mm
Surface area = 23.50 × 15.60 = 366.60 mm²
Height = 15.60 mm
Surface area = 23.50 × 15.60 = 366.60 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 
Nikon D1 pixel pitch
Sensor width = 23.70 mm
Sensor resolution width = 1995 pixels
Sensor resolution width = 1995 pixels
Pixel pitch =  23.70  × 1000  = 11.88 µm 
1995 
Nikon D7100 pixel pitch
Sensor width = 23.50 mm
Sensor resolution width = 6032 pixels
Sensor resolution width = 6032 pixels
Pixel pitch =  23.50  × 1000  = 3.9 µm 
6032 
Pixel area
The area of one pixel can be calculated by simply squaring the pixel pitch:
You could also divide sensor surface area with effective megapixels:
Pixel area = pixel pitch²
You could also divide sensor surface area with effective megapixels:
Pixel area =  sensor surface area in mm² 
effective megapixels 
Nikon D1 pixel area
Pixel pitch = 11.88 µm
Pixel area = 11.88² = 141.13 µm²
Pixel area = 11.88² = 141.13 µm²
Nikon D7100 pixel area
Pixel pitch = 3.9 µm
Pixel area = 3.9² = 15.21 µm²
Pixel area = 3.9² = 15.21 µm²
Pixel density
Pixel density can be calculated with the following formula:
You could also use this formula:
Pixel density = (  sensor resolution width in pixels  )² / 1000000 
sensor width in cm 
You could also use this formula:
Pixel density =  effective megapixels × 1000000  / 10000 
sensor surface area in mm² 
Nikon D1 pixel density
Sensor resolution width = 1995 pixels
Sensor width = 2.37 cm
Pixel density = (1995 / 2.37)² / 1000000 = 0.71 MP/cm²
Sensor width = 2.37 cm
Pixel density = (1995 / 2.37)² / 1000000 = 0.71 MP/cm²
Nikon D7100 pixel density
Sensor resolution width = 6032 pixels
Sensor width = 2.35 cm
Pixel density = (6032 / 2.35)² / 1000000 = 6.59 MP/cm²
Sensor width = 2.35 cm
Pixel density = (6032 / 2.35)² / 1000000 = 6.59 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. 22.8 × 15.5 sensor for example has a ratio of 1.47.
2. With the ratio (r) known we can calculate the X from the formula below, where X is a vertical number of pixels:
3. To get sensor resolution we then multiply X with the corresponding ratio:
Resolution horizontal: X × r
Resolution vertical: X
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. 22.8 × 15.5 sensor for example has a ratio of 1.47.
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 → 

Resolution horizontal: X × r
Resolution vertical: X
Nikon D1 sensor resolution
Sensor width = 23.70 mm
Sensor height = 15.50 mm
Effective megapixels = 2.60
Resolution horizontal: X × r = 1304 × 1.53 = 1995
Resolution vertical: X = 1304
Sensor resolution = 1995 x 1304
Sensor height = 15.50 mm
Effective megapixels = 2.60
r = 23.70/15.50 = 1.53 

Resolution vertical: X = 1304
Sensor resolution = 1995 x 1304
Nikon D7100 sensor resolution
Sensor width = 23.50 mm
Sensor height = 15.60 mm
Effective megapixels = 24.10
Resolution horizontal: X × r = 3995 × 1.51 = 6032
Resolution vertical: X = 3995
Sensor resolution = 6032 x 3995
Sensor height = 15.60 mm
Effective megapixels = 24.10
r = 23.50/15.60 = 1.51 

Resolution vertical: X = 3995
Sensor resolution = 6032 x 3995
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 
Nikon D1 crop factor
Sensor diagonal in mm = 28.32 mm
Crop factor =  43.27  = 1.53 
28.32 
Nikon D7100 crop factor
Sensor diagonal in mm = 28.21 mm
Crop factor =  43.27  = 1.53 
28.21 
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).
Nikon D1 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 D1, take the aperture of the lens
you're using and multiply it with crop factor.
Crop factor for Nikon D1 is 1.53
Crop factor for Nikon D1 is 1.53
Nikon D7100 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 D7100, take the aperture of the lens
you're using and multiply it with crop factor.
Crop factor for Nikon D7100 is 1.53
Crop factor for Nikon D7100 is 1.53
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