Sony A7S vs Olympus E-620 Comparison

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Sony A7S

12 MP | Full frame (35.8 x 23.9 mm) CMOS Sensor

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Olympus E-620

12 MP | Four Thirds (17.3 x 13 mm) CMOS Sensor

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Sony A7S vs Olympus E-620 Comparison Overview

Here we are comparing two cameras with different body types: Sony A7S, which was introduced in April 2014 is a Pro Mirrorless camera with a 12.0MP Full frame sensor whereas Olympus E-620, which was introduced in July 2009 is a Entry-Level DSLR camera with a 12.0MP Four Thirds sensor. As you can see, E-620 is 5 years older than A7S. Let's see if this age difference between two cameras makes a big difference.

Despite some fundamental differences of these two body types, Mirrorless cameras are becoming serious alternatives to DSLR cameras thanks to their size/weight advantages and recent improvements in their focus speeds , which makes this comparison even more interesting.

Here is a brief look at the main features of Sony A7S and Olympus E-620 before getting into our more detailed comparison.

Sony A7S Key Specs

Announcement Date: 2014-04-06

12MP - Full frame CMOS Sensor

ISO 100 - 409600

Sony E Mount

3 Tilting Screen

2359k dot Electronic viewfinder

5 fps continuous shooting

4K (UHD) - 3840 x 2160 video resolution

120 fps High-Speed Video

Built-in Wireless

489g. 127 x 94 x 48 mm

Weather Sealed Body

Olympus E-620 Key Specs

Announcement Date: 2009-07-06

12MP - Four Thirds CMOS Sensor

ISO 100 - 3200

Four Thirds Mount

Sensor-shift Image Stabilization

2.7" Fully Articulated Screen

Optical (pentamirror) viewfinder

4 fps continuous shooting

No Video Mode

500g. 130 x 94 x 60 mm

Sony A7S was replaced by Sony Alpha 7S II. You may also be interested in these comparisons:
Sony Alpha 7S II vs Sony Alpha A7S
Sony Alpha 7S II vs Olympus E-620

Let's read on the following sections in order to better understand in detail how Sony A7S and Olympus E-620 compares and hopefully end up with enough arguments to decide which one is better for you.

Reasons to choose Sony Alpha A7S over Olympus E-620

Wireless Connection	Built-In vs None	Better connectivity
Viewfinder Magnification	0.71x vs 0.48x	Larger Viewfinder
Max ISO	409.600 vs 3.200	12700% higher Max ISO
Number of Focus Points	25 vs 7	18 more focus points
LCD Screen Size	3 vs 2.7"	0.3 inches larger display
LCD Screen Resolution	1.230k dots vs 230k dots	434% higher resolution screen
Viewfinder Coverage	100% vs 95%	More accurate viewfinder
Max Mech. Shutter	1/8000s vs 1/4000s	faster mechanical shutter
Continuous Shooting	5.0fps vs 4.0fps	1 fps faster
Weight	489 g vs 500 g	11 g lighter
Microphone Port	Yes vs No	High quality audio recording option
Headphone Port	Yes vs No	better video control
Environmental Sealing	Yes vs No	shoot at tough conditions
Color Depth	23.9 vs 21.3	higher color depth
Dynamic Range	13.2 vs 10.3	higher dynamic range
Low Light ISO	3702 vs 536	better High ISO performance
Sensor Pixel Area	71.24µm² vs 18.45µm²	286% larger pixel area
Max Video Resolution	3840 x 2160 vs None	Higher Resolution Video
NFC Connection	Yes vs No	Easy wireless connectivity with compatible devices
Smartphone Remote	Yes vs No	Remote control your camera with a smartphone

Reasons to choose Olympus E-620 over Sony Alpha A7S

Image Stabilization	Sensor-shift vs None	Sharper images at longer focal lengths and long exposures
Built-in Flash	Yes vs No	Useful in low-light
Battery Life	500 shots vs 360 shots	140 more frames with a single charge
Selfie & Vlogger Friendly LCD	Yes vs No	Rotate LCD for taking Selfies

Common Strengths of Sony Alpha A7S and Olympus E-620

Adjustable LCD Screen	Tilting vs Fully Articulated	Flexible shooting positions
External Flash Shoe	Yes vs Yes	Better for flash photography
Viewfinder	Yes (Electronic) vs Yes (Optical)	Better framing and control
RAW Support	Yes vs Yes	Better image quality
Face Detection Focus	Yes vs Yes	very handy for portraits
AE Bracketing	Yes vs Yes	Useful for tough lighting conditions and HDR

Common Weaknesses of Sony Alpha A7S and Olympus E-620

LCD Screen Size	3 vs 2.7"	Small display

Sony A7S vs Olympus E-620: Physical Specs and Body features Comparison

Size and weight is a big decision factor when you are trying to find the ideal camera for your needs. In this section, We are going to illustrate Sony A7S and Olympus E-620 side-by-side from the front, back and top in their relative dimensions. Sony A7S has external dimensions of 127 x 94 x 48 mm (5 x 3.7 x 1.89″) and weighs 489 g (1.08 lb / 17.25 oz) (including batteries). Olympus E-620 has external dimensions of 130 x 94 x 60 mm (5.12 x 3.7 x 2.36″) and weighs 500 g (1.10 lb / 17.64 oz) (including batteries).

Below you can see the front view size comparison of Sony A7S and Olympus E-620. Sony A7S is 3mm narrower and 12mm thinner than Sony A7S but they have the same height of 94mm.

Comparison image of Sony A7S and Olympus E-620 Size, Weight and External Dimensions - Front View

Here is the back view size comparison of Sony A7S and Olympus E-620.

Comparison image of Sony A7S and Olympus E-620 Size and Weight - Back View

Weight is another important factor especially when deciding on a camera that you want to carry with you all day. Sony A7S is 11g lighter than the Olympus E-620 but we don't think this will make a significant difference.

Also keep in mind that body weight is not the only deciding factor when comparing two interchangeable camera bodies, you have to also take into account the lenses that you will be using with these bodies. Since Sony A7S has a Full frame sensor and Olympus E-620 has a smaller Four Thirds sensor, Olympus E-620's lenses for a similar focal length and aperture will generally be lighter and smaller than the Sony A7S lenses.

Weight Comparison

DSLR Cameras

A7S

E-620

Min

Average

Max

Thickness Comparison

DSLR Cameras

A7S

E-620

Min

Average

Max

Weather Sealing

With its weather sealed body, we believe that A7S has a big advantage over E-620 which doesn't provide any kind of environmental sealing.

LCD Screen Size and Features

Sony A7S's 3 LCD screen is slightly larger than Olympus E-620's 2.7" screen.

Sony A7S vs Olympus E-620: Sensor Comparison

Both Sony A7S and Olympus E-620 have 12.0 MP resolution sensors but Sony A7S's sensor is Full frame (35.8 x 23.9 mm ) and Olympus E-620's sensor is Four Thirds (17.3 x 13 mm ).

Since Sony A7S's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Olympus E-620.

Below you can see the A7S and E-620 sensor size comparison.

Sensor Size and Resolution Comparison image of Sony A7S and Olympus E-620 Cameras

As seen above, Sony A7S has a 3.8x Larger sensor area than Olympus E-620. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in same focal length and aperture.

DxOMark Sensor Scores

Both Sony A7S and Olympus E-620 sensors have been tested by DxoMark. DxoMark scores camera sensors for color depth (DXO Portrait), dynamic range (DXO Landscape) and low-light sensitivity (DXO Sports), and also gives them an overall score. Of the two cameras that we are comparing, A7S has scored 87, 32 points higher than E-620.

Model	Overall	Color Depth	Dynamic Range	Low-light ISO
Sony A7S	87	23.9 bits	13.2 Evs	3702 ISO
Olympus E-620	55	21.3 bits	10.3 Evs	536 ISO

Sony A7S vs Olympus E-620 Comparison of Available Lenses

Which camera has more lenses?

Number of available lenses is a big decision factor while choosing your interchangeable lens camera. When we look at the available lenses for these two cameras, we see that Sony A7S has an advantage over Olympus E-620. There are 128 lenses for Sony A7S's Sony E mount, on the other hand there are only 45 lenses for Olympus E-620's Four Thirds lens mount.

Another important factor is the availability of image stabilization. Olympus E-620 has a big advantage in this regard because it has a sensor based image stabilization which means that all the lenses mounted to this body will be stabilized. On the other hand, Sony A7S doesn't have this feature so you have to buy a lens with optical stabilization feature. Currently there are 31 lenses for Sony E mount with Optical Image Stabilization features.

Lens Type	# of Sony A7S Lenses	# of Olympus E-620 Lenses
Standard Zoom	12 (9 Full Frame)	8
Standard Prime	18 (9 Full Frame)	4
Wideangle Zoom	7 (6 Full Frame)	4
Wideangle Prime	42 (26 Full Frame)	9
Telephoto Zoom	9 (7 Full Frame)	6
Telephoto Prime	18 (14 Full Frame)	4
SuperZoom	8 (1 Full Frame)	2
Wideangle Fisheye Prime	2 (0 Full Frame)	3
Macro Prime	8 (7 Full Frame)	4
Perspective Control Prime	2 (2 Full Frame)	n/a
Telephoto Mirror Prime	n/a	1
TOTAL	128 (81 Full Frame)	45

What types of Photography are Sony A7S and Olympus E-620 Good for?

In this section, we rank and compare Sony A7S and Olympus E-620 for five different photography types in order to make your decision process easier in case you are specifically interested in one or more of these areas.

Sony A7S for Portrait Photography

GOOD

Olympus E-620 for Portrait Photography

GOOD

Large Full frame (35.8 x 23.9 mm) sensor
Electronic Built-in Viewfinder
Good Ergonomics&Handling
Average Resolution Sensor: 12.0MP
No Image Stabilization
Read the details

Large Four Thirds (17.3 x 13 mm) sensor
Image Stabilization
Optical Built-in Viewfinder
Good Ergonomics&Handling
Average Resolution Sensor: 12.0MP
Read the details

Sony A7S for Street Photography

GOOD

Olympus E-620 for Street Photography

EXCELLENT

Large Full frame (35.8 x 23.9 mm) sensor
Electronic Built-in Viewfinder
Live-view
Face-Detection Focusing
Tilting LCD Screen
Medium sized Body
No Image Stabilization
Read the details

Large Four Thirds (17.3 x 13 mm) sensor
Image Stabilization
Optical Built-in Viewfinder
Live-view
Face-Detection Focusing
Fully Articulated LCD Screen
Large Body
Read the details

Sony A7S for Sports Photography

GOOD

Olympus E-620 for Sports Photography

GOOD

Electronic Built-in Viewfinder
Good Ergonomics&Handling
Environmental Sealings
Fast Max shutter speed: 1/8000s
25 Focus Points
Good Low Light ISO
Wireless Connection
Average Continuous Shooting: 5.0fps
No Image Stabilization
Read the details

Image Stabilization
Optical Built-in Viewfinder
Good Ergonomics&Handling
Fast Max shutter speed: 1/4000s
Average Continuous Shooting: 4.0fps
Environmental Sealings
7 Focus Points
Read the details

Sony A7S for Daily Photography

EXCELLENT

Olympus E-620 for Daily Photography

GOOD

Large Full frame (35.8 x 23.9 mm) sensor
Environmental Sealings
Medium size Body
489g
Body Thickness 48mm
Read the details

Large Four Thirds (17.3 x 13 mm) sensor
Large Body
500g
Body Thickness 60mm
Read the details

Sony A7S for Landscape Photography

AVERAGE

Olympus E-620 for Landscape Photography

POOR

Large Full frame (35.8 x 23.9 mm) sensor
Environmental Sealings
Live-view
Average Resolution Sensor: 12.0MP
Read the details

Large Four Thirds (17.3 x 13 mm) sensor
Live-view
Average Resolution Sensor: 12.0MP
No Environmental Sealings
Read the details

Sony A7S vs Olympus E-620: OUR DECISION

You may have already made your decision about which camera suits better for your needs and your budget so far but in case you wonder how we rated Sony A7S and Olympus E-620, below you can find their scores in five different aspects. Our Decision Algorithm dynamically scores cameras using 63 different specs, current price and DxO Mark scores (where possible) in order to make a more objective and consistent comparison.

Here is a summary of how Sony A7S and Olympus E-620 scores compare:

Sony A7S

Imaging

Features

Value

Portability

Overall

Ranked #39 out of 86 in SLR-style mirrorless cameras
Ranked #71 out of 1220 in all Cameras

Olympus E-620

Imaging

Features

Value

Portability

Overall

Ranked #53 out of 78 in Compact SLR cameras
Ranked #363 out of 1220 in all Cameras

Sony A7S is the clear winner of this comparison. It has a higher Overall Score and beats Olympus E-620 in all criteria. It has better general image quality, more features, more compact body and offers more value for the money

Olympus E-620 vs Sony A7S Specs Table

Detailed comparison of specifications

General	Sony Alpha A7S	Olympus E-620
Brand	Sony	Olympus
Announced	2014-04-06	2009-07-06
Body Type	SLR-style mirrorless	Compact SLR
Sensor
Type	CMOS	CMOS
Size	Full frame	Four Thirds
Dimensions	35.8 x 23.9 mm	17.3 x 13 mm
Area	855.62mm²	224.90mm²
Megapixels	12 megapixels	12 megapixels
Max Resolution	4240 x 2832	4032 x 3024
Max Native Light sensitivity	409,600 ISO	3,200 ISO
Min Native Light sensitivity	100 ISO	100 ISO
RAW Support
Autofocus
AF Touch
AF Continuous
AF Single
AF Tracking
AF Selective
AF Center
AF Multi Area
AF Live View
AF Face Detection
AF Contrast Detection
AF Phase Detection
Number of Focus Points	25	7
Lens
Manual Focus
Lens Mount	Sony E	Four Thirds
Number of Available Lenses	128	45
Screen
Type	Tilting	Fully Articulated
Size	3	2.7"
Resolution	1,230k dots	230k dots
Touch Screen
Viewfinder
Viewfinder	Electronic	Optical (pentamirror)
Viewfinder Resolution	2,359k dots	no electronic viewfinder
Viewfinder Coverage	100%	95%
Viewfinder Magnification	0.71x	0.48x
Photography Features
Max Mechanical Shutter	1/8000s	1/4000s
Shutter Priority
Aperture Priority
Manual Exposure Mode
Custom White Balance
Image Stabilization	No	Sensor-shift
Built-in Flash
Flash Range	no built-in flash	12.00 m
Max Flash Sync	n/a	1/180s
External Flash
Continuous Shooting	5.0 fps	4.0 fps
Multi-Segment
Average
Spot
Partial
AF-Area
Center Weighted
AE Bracketing
WB Bracketing
Video Features
Max Video Resolution	3840 x 2160	None
Video Formats	MPEG-4, AVCHD, XAVC	n/a
Microphone Port
Headphone Port
Connectivity
Wireless Connectivity	Built-In	None
HDMI
Physical
Environmental Sealing
Weight	489g	500g
Dimensions	127 x 94 x 48mm	130 x 94 x 60mm
Battery Life	360 shots	500 shots
Other Features
Timelapse Recording	With Downloadable App
GPS	None	None
DxO Sensor Scores
DxO Overall Score	87	55
DxO Color Depth	23.9	21.3
DxO Dynamic Range	13.2	10.3
DxO Low Light ISO	3702	536
	Report a correction	Report a correction