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Sigma SD9 vs Sony a1

Portability
54
Imaging
39
Features
27
Overall
34
Sigma SD9 front
 
Sony Alpha a1 front
Portability
61
Imaging
81
Features
93
Overall
85

Sigma SD9 vs Sony a1 Key Specs

Sigma SD9
(Full Review)
  • 3MP - APS-C Sensor
  • 1.8" Fixed Screen
  • ISO 100 - 400
  • 1/6000s Max Shutter
  • No Video
  • Sigma SA Mount
  • 950g - 152 x 120 x 79mm
  • Announced November 2002
  • Later Model is Sigma SD10
Sony a1
(Full Review)
  • 50MP - Full frame Sensor
  • 3" Tilting Display
  • ISO 100 - 32000 (Increase to 102400)
  • Sensor based 5-axis Image Stabilization
  • 1/8000s Max Shutter
  • 7680 x 4320 video
  • Sony E Mount
  • 737g - 129 x 97 x 70mm
  • Launched January 2021
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Sigma SD9 vs Sony a1 Overview

Let's take a deeper look at the Sigma SD9 versus Sony a1, one being a Advanced DSLR and the other is a Pro Mirrorless by rivals Sigma and Sony. There is a sizeable difference among the image resolutions of the SD9 (3MP) and a1 (50MP) and the SD9 (APS-C) and a1 (Full frame) possess different sensor sizes.

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The SD9 was revealed 19 years earlier than the a1 and that is a fairly large gap as far as camera tech is concerned. The two cameras offer different body type with the Sigma SD9 being a Mid-size SLR camera and the Sony a1 being a SLR-style mirrorless camera.

Before going in to a more detailed comparison, below is a quick summary of how the SD9 matches up against the a1 in regards to portability, imaging, features and an overall rating.

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Reasons to pick Sigma SD9 over the Sony a1

 SD9 a1 

Reasons to pick Sony a1 over the Sigma SD9

 a1 SD9 
LaunchedJanuary 2021November 2002Fresher by 221 months
Display typeTiltingFixed Tilting display
Display sizing3"1.8"Larger display (+1.2")
Display resolution1440k130kSharper display (+1310k dot)
Touch display Easily navigate

Common features in the Sigma SD9 and Sony a1

 SD9 a1 
Focus manually Dial precise focus
Selfie screen Neither offers selfie screen

Sigma SD9 vs Sony a1 Physical Comparison

For anybody who is looking to carry your camera often, you'll have to factor in its weight and measurements. The Sigma SD9 offers outside measurements of 152mm x 120mm x 79mm (6.0" x 4.7" x 3.1") with a weight of 950 grams (2.09 lbs) whilst the Sony a1 has proportions of 129mm x 97mm x 70mm (5.1" x 3.8" x 2.8") accompanied by a weight of 737 grams (1.62 lbs).

Check the Sigma SD9 versus Sony a1 in the new Camera with Lens Size Comparison Tool. Camera Size Comparison with Lenses

Do not forget, the weight of an Interchangeable Lens Camera will differ based on the lens you have chosen at that time. Below is the front view scale comparison of the SD9 compared to the a1.

Sigma SD9 vs Sony a1 size comparison

Taking into account size and weight, the portability rating of the SD9 and a1 is 54 and 61 respectively.

Sigma SD9 vs Sony a1 top view buttons comparison

Sigma SD9 vs Sony a1 Sensor Comparison

Generally, it is very difficult to visualize the gap in sensor sizing just by going through specifications. The visual below should give you a far better sense of the sensor sizing in the SD9 and a1.

To sum up, each of the cameras offer different megapixel count and different sensor sizing. The SD9 having a smaller sensor is going to make shooting shallower DOF tougher and the Sony a1 will provide extra detail because of its extra 47 Megapixels. Greater resolution will also help you crop images a little more aggressively. The older SD9 will be disadvantaged in sensor tech.

Sigma SD9 vs Sony a1 sensor size comparison

Sigma SD9 vs Sony a1 Screen and ViewFinder

Sigma SD9 vs Sony a1 Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Sigma SD9 Portrait photography information
Sony a1 Portrait photography information
47
you can focus manually
nice sensor size (APS-C)
delivers RAW files
no liveview
megapixel count low (3 megapixels)
88
has manual focus
high flash sync speed (1/400 seconds)
excellent sensor resolution (50MP)
sensor size is large (Full frame)
has face detection focus
saves RAW files
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Street Comparison

Sigma SD9 as a Street photography camera
Sony a1 as a Street photography camera
43
nice sensor size (APS-C)
delivers RAW files
screen is fixed
does not have image stabilization
more heavy than competitors (950g)
maximum ISO low (400)
79
screen tilts up and down
built in image stabilization (Sensor based 5-axis)
sensor size is large (Full frame)
saves RAW files
supports touch to focus
weather sealing
very good high ISO (32,000)
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Sports Comparison

Sigma SD9 Sports photography information
Sony a1 Sports photography information
36
high shutter speed (1/6,000 seconds)
nice sensor size (APS-C)
no liveview
does not have image stabilization
megapixel count low (3 megapixels)
doesn't have phase detect AF
90
great max shutter speed (1/8,000s)
silent shutter (1/32,000s)
fast shooting (30.0 fps)
built in image stabilization (Sensor based 5-axis)
excellent sensor resolution (50 megapixels)
sensor size is large (Full frame)
has tracking autofocus
weather sealing
great battery (530 per charge)
supports phase detect auto focus
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Travel Comparison

Sigma SD9 Travel photography info
Sony a1 Travel photography info
29
doesn't have Timelapse mode
more heavy than competitors (950 grams)
megapixel count low (3 megapixels)
does not have selfie friendly screen
73
great battery (530 shots)
weather sealing
has bluetooth
supports touch to focus
excellent sensor resolution (50MP)
screen isn't selfie friendly
Photography Glossary

Landscape Comparison

Landscape photography with Sigma SD9
Landscape photography with Sony a1
41
you can focus manually
swap lenses (Sigma SA mount)
nice sensor size (APS-C)
delivers RAW files
screen is small (1.8")
no liveview
does not have image stabilization
megapixel count low (3 megapixels)
maximum ISO low (400)
doesn't have Timelapse mode
88
has manual focus
change lenses (Sony E mount)
decent sized screen (3 inches)
built in image stabilization (Sensor based 5-axis)
excellent sensor resolution (50 megapixels)
sensor size is large (Full frame)
very good high ISO (32,000)
saves RAW files
weather sealing
great battery (530 CIPA)
has double storage slots
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Vlogging Comparison

Sigma SD9 Vlogging factors
Sony a1 Vlogging factors
9
can't record video
36
screen is touchscreen
built in image stabilization (Sensor based 5-axis)
has face detection focus
high res video (7680 x 4320 pxls)
comes with external microphone port
screen isn't selfie friendly
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Sigma SD9 vs Sony a1 Specifications

Detailed spec comparison table for Sigma SD9 and Sony a1
 Sigma SD9Sony Alpha a1
General Information
Brand Sigma Sony
Model Sigma SD9 Sony Alpha a1
Category Advanced DSLR Pro Mirrorless
Announced 2002-11-26 2021-01-26
Body design Mid-size SLR SLR-style mirrorless
Sensor Information
Sensor type CMOS (Foveon X3) BSI-CMOS
Sensor size APS-C Full frame
Sensor measurements 20.7 x 13.8mm 35.9 x 24mm
Sensor area 285.7mm² 861.6mm²
Sensor resolution 3MP 50MP
Anti aliasing filter
Aspect ratio 3:2 1:1, 4:3, 3:2 and 16:9
Full resolution 2268 x 1512 8640 x 5760
Max native ISO 400 32000
Max boosted ISO - 102400
Lowest native ISO 100 100
RAW photos
Lowest boosted ISO - 50
Autofocusing
Manual focus
Touch focus
Autofocus continuous
Autofocus single
Tracking autofocus
Selective autofocus
Autofocus center weighted
Multi area autofocus
Autofocus live view
Face detection focus
Contract detection focus
Phase detection focus
Number of focus points - 759
Lens
Lens mounting type Sigma SA Sony E
Number of lenses 76 133
Crop factor 1.7 1
Screen
Range of screen Fixed Type Tilting
Screen size 1.8 inches 3 inches
Resolution of screen 130k dot 1,440k dot
Selfie friendly
Liveview
Touch display
Viewfinder Information
Viewfinder Optical (pentaprism) Electronic
Viewfinder resolution - 9,437k dot
Viewfinder coverage 98 percent 100 percent
Viewfinder magnification 0.77x 0.9x
Features
Slowest shutter speed 30s 30s
Maximum shutter speed 1/6000s 1/8000s
Maximum silent shutter speed - 1/32000s
Continuous shooting speed - 30.0fps
Shutter priority
Aperture priority
Manually set exposure
Exposure compensation Yes Yes
Custom white balance
Image stabilization
Built-in flash
Flash range no built-in flash no built-in flash
Flash settings - Flash off, Autoflash, Fill-flash, Slow Sync., Rear Sync., Red-eye reduction, Wireless, Hi-speed sync
External flash
AEB
WB bracketing
Maximum flash sync 1/180s 1/400s
Exposure
Multisegment metering
Average metering
Spot metering
Partial metering
AF area metering
Center weighted metering
Video features
Supported video resolutions - 7680x4320 (30p, 25p, 23.98)
Max video resolution None 7680x4320
Video data format - XAVC S, XAVC HS, H.264, H.265
Microphone jack
Headphone jack
Connectivity
Wireless None Built-In
Bluetooth
NFC
HDMI
USB USB 1.0 (1.5 Mbit/sec) Yes
GPS None None
Physical
Environment seal
Water proof
Dust proof
Shock proof
Crush proof
Freeze proof
Weight 950 gr (2.09 pounds) 737 gr (1.62 pounds)
Dimensions 152 x 120 x 79mm (6.0" x 4.7" x 3.1") 129 x 97 x 70mm (5.1" x 3.8" x 2.8")
DXO scores
DXO All around score not tested not tested
DXO Color Depth score not tested not tested
DXO Dynamic range score not tested not tested
DXO Low light score not tested not tested
Other
Battery life - 530 photos
Style of battery - Battery Pack
Battery model - NP-FZ100
Self timer Yes (10 sec) Yes
Time lapse recording
Storage media Compact Flash Type I or II Dual SD/CFexpress Type A slots (UHS-II supported)
Storage slots 1 2
Launch pricing $3,001 $6,498