Sony a6100 vs Sony Alpha SLT-A99 Comparison

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a6100 image
vs
Alpha SLT-A99 image
Sony a6100 Sony Alpha SLT-A99
Megapixels
24.20
24.30
Image resolution
6000 x 4000
6000 x 4000

Sensor

Sensor type
CMOS
CMOS
Sensor size
23.5 x 15.6 mm
35.8 x 23.8 mm
Sensor resolution
6045 x 4003
6038 x 4025
Diagonal
28.21 mm
42.99 mm
Compare sensor size:

Sensor Size

Actual size is set to screen
vs
1:2.32
(ratio)
Sony a6100 Sony Alpha SLT-A99
Surface area:
366.60 mm² vs 852.04 mm²
Difference: 485.44 mm² (132%)
Alpha SLT-A99 sensor is ~2.32x bigger than a6100's.
Note: You are comparing sensors of very different generations. There is a gap of 7 years between Sony a6100 (2019) and Sony Alpha SLT-A99 (2012). Seven years is a lot of time in terms of technology, meaning newer sensors are overall much more efficient than the older ones.
Pixel pitch
3.89 µm
5.93 µm
Difference: 2.04 µm (52%)
Pixel pitch of Alpha SLT-A99 is ~52% higher than a6100's.
Pixel area
15.13 µm²
35.16 µm²
Relative pixel sizes:
vs
Pixel area difference: 20.03 µm² (132%)
Pixel on Sony Alpha SLT-A99 sensor is ~132% bigger than Sony a6100's.
Pixel density
6.62 MP/cm²
2.84 MP/cm²
Difference: 3.78 µm (133%)
Sony a6100 has ~133% higher pixel density than Sony Alpha SLT-A99's.

Specs

Sony a6100
Sony Alpha SLT-A99
Crop factor
1.53
1.01
Megapixels
25.00
24.70
Optical zoom
n/a
Digital zoom
ISO range
Auto, 100-32000 (expands to 51200)
Auto, 100, 200, 400, 800, 1600, 3200, 6400, 12800, 25600
RAW support
Manual focus
Focus range
n/a
Macro focus range
n/a
Focal length
n/a
Aperture priority
Max. aperture
n/a
Metering types
Multi, Center-weighted, Spot
Multi, Center-weighted, Spot
Exposure compensation
±5 EV (in 1/3 EV, 1/2 EV steps)
±5 EV (in 1/3 EV, 1/2 EV steps)
Shutter priority
Shutter speed (min)
30s
30s
Shutter speed (max)
1/4000s
1/8000s
Built-in flash
External flash
Viewfinder type
Electronic
Electronic
White balance
10
8
Screen size
3"
3"
Screen resolution
921,600 dots
1,229,000 dots
Video available
Max. video resolution
3840x2160 (30p/​25p/​24p)
Storage type
SD/SDHC/SDXC, MS Pro Duo
Memory Stick PRO Duo/Pro-HG Duo; SD, SDHC and SDXC
USB Version
2.0 (480 Mbit/sec)
2.0 (480 Mbit/sec)
HDMI
Wireless support
GPS
Battery
NP-FW50 lithium-ion battery
Lithium-Ion NP-FM500H rechargeable battery
Weight
396g
812g
Body size
120 x 66.9 x 59.4 mm
147 x 111 x 78 mm
Released
2019
2012


Compare various cameras

vs

Diagonal

Diagonal is calculated by the use of Pythagorean theorem:
Diagonal =  w² + h²
where w = sensor width and h = sensor height

Sony a6100 diagonal

w = 23.50 mm
h = 15.60 mm
Diagonal =  23.50² + 15.60²   = 28.21 mm

Sony Alpha SLT-A99 diagonal

w = 35.80 mm
h = 23.80 mm
Diagonal =  35.80² + 23.80²   = 42.99 mm


Surface area

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

a6100 sensor area

Width = 23.50 mm
Height = 15.60 mm

Surface area = 23.50 × 15.60 = 366.60 mm²

Alpha SLT-A99 sensor area

Width = 35.80 mm
Height = 23.80 mm

Surface area = 35.80 × 23.80 = 852.04 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

a6100 pixel pitch

Sensor width = 23.50 mm
Sensor resolution width = 6045 pixels
Pixel pitch =   23.50  × 1000  = 3.89 µm
6045

Alpha SLT-A99 pixel pitch

Sensor width = 35.80 mm
Sensor resolution width = 6038 pixels
Pixel pitch =   35.80  × 1000  = 5.93 µm
6038


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

a6100 pixel area

Pixel pitch = 3.89 µm

Pixel area = 3.89² = 15.13 µm²

Alpha SLT-A99 pixel area

Pixel pitch = 5.93 µm

Pixel area = 5.93² = 35.16 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

a6100 pixel density

Sensor resolution width = 6045 pixels
Sensor width = 2.35 cm

Pixel density = (6045 / 2.35)² / 1000000 = 6.62 MP/cm²

Alpha SLT-A99 pixel density

Sensor resolution width = 6038 pixels
Sensor width = 3.58 cm

Pixel density = (6038 / 3.58)² / 1000000 = 2.84 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

a6100 sensor resolution

Sensor width = 23.50 mm
Sensor height = 15.60 mm
Effective megapixels = 24.20
r = 23.50/15.60 = 1.51
X =  24.20 × 1000000  = 4003
1.51
Resolution horizontal: X × r = 4003 × 1.51 = 6045
Resolution vertical: X = 4003

Sensor resolution = 6045 x 4003

Alpha SLT-A99 sensor resolution

Sensor width = 35.80 mm
Sensor height = 23.80 mm
Effective megapixels = 24.30
r = 35.80/23.80 = 1.5
X =  24.30 × 1000000  = 4025
1.5
Resolution horizontal: X × r = 4025 × 1.5 = 6038
Resolution vertical: X = 4025

Sensor resolution = 6038 x 4025


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


a6100 crop factor

Sensor diagonal in mm = 28.21 mm
Crop factor =   43.27  = 1.53
28.21

Alpha SLT-A99 crop factor

Sensor diagonal in mm = 42.99 mm
Crop factor =   43.27  = 1.01
42.99

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).

a6100 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 Sony a6100, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Sony a6100 is 1.53

Alpha SLT-A99 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 Sony Alpha SLT-A99, take the aperture of the lens you're using and multiply it with crop factor.

Crop factor for Sony Alpha SLT-A99 is 1.01

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