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Panasonic G3 vs Pentax 645D

Portability
83
Imaging
51
Features
62
Overall
55
Panasonic Lumix DMC-G3 front
 
Pentax 645D front
Portability
50
Imaging
76
Features
52
Overall
66

Panasonic G3 vs Pentax 645D Key Specs

Panasonic G3
(Full Review)
  • 16MP - Four Thirds Sensor
  • 3" Fully Articulated Screen
  • ISO 160 - 6400
  • 1920 x 1080 video
  • Micro Four Thirds Mount
  • 336g - 115 x 84 x 47mm
  • Announced July 2011
  • Previous Model is Panasonic G2
  • Refreshed by Panasonic G5
Pentax 645D
(Full Review)
  • 40MP - Medium format Sensor
  • 3" Fixed Display
  • ISO 200 - 1600
  • No Anti-Alias Filter
  • No Video
  • Pentax 645AF2 Mount
  • 1480g - 156 x 117 x 119mm
  • Introduced March 2010
  • Newer Model is Pentax 645Z
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Panasonic G3 vs Pentax 645D Overview

Below, we are contrasting the Panasonic G3 and Pentax 645D, one is a Entry-Level Mirrorless and the other is a Pro DSLR by manufacturers Panasonic and Pentax. There is a big difference between the sensor resolutions of the G3 (16MP) and 645D (40MP) and the G3 (Four Thirds) and 645D (Medium format) enjoy different sensor dimensions.

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The G3 was introduced 17 months after the 645D making the cameras a generation away from each other. The two cameras come with different body type with the Panasonic G3 being a SLR-style mirrorless camera and the Pentax 645D being a Large SLR camera.

Before delving in to a comprehensive comparison, below is a short introduction of how the G3 grades vs the 645D with respect to portability, imaging, features and an overall mark.

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Reasons to pick Panasonic G3 over the Pentax 645D

 G3 645D 
IntroducedJuly 2011March 2010Newer by 17 months
Display typeFully ArticulatedFixed Fully Articulating display
Selfie screen Easy selfies
Touch friendly display Easily navigate

Reasons to pick Pentax 645D over the Panasonic G3

 645D G3 
Display resolution921k460kCrisper display (+461k dot)

Common features in the Panasonic G3 and Pentax 645D

 G3 645D 
Manual focus Very exact focus
Display dimension3"3"Identical display sizing

Panasonic G3 vs Pentax 645D Physical Comparison

When you are aiming to travel with your camera regularly, you're going to have to factor in its weight and volume. The Panasonic G3 has exterior dimensions of 115mm x 84mm x 47mm (4.5" x 3.3" x 1.9") with a weight of 336 grams (0.74 lbs) whilst the Pentax 645D has sizing of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") having a weight of 1480 grams (3.26 lbs).

Analyze the Panasonic G3 and Pentax 645D in the all new Camera with Lens Size Comparison Tool. Camera Size Comparison with Lenses

Don't forget, the weight of an Interchangeable Lens Camera will vary dependant on the lens you use during that time. Below is the front view size comparison of the G3 vs the 645D.

Panasonic G3 vs Pentax 645D size comparison

Considering size and weight, the portability grade of the G3 and 645D is 83 and 50 respectively.

Panasonic G3 vs Pentax 645D top view buttons comparison

Panasonic G3 vs Pentax 645D Sensor Comparison

In many cases, it is hard to picture the contrast between sensor dimensions purely by reviewing a spec sheet. The pic below will help give you a clearer sense of the sensor sizes in the G3 and 645D.

Clearly, both of the cameras posses different megapixel count and different sensor dimensions. The G3 having a tinier sensor is going to make getting shallower depth of field tougher and the Pentax 645D will deliver more detail using its extra 24 Megapixels. Greater resolution will also help you crop pics somewhat more aggressively. The newer G3 should have an advantage with regard to sensor innovation.

Panasonic G3 vs Pentax 645D sensor size comparison

Panasonic G3 vs Pentax 645D Screen and ViewFinder

Panasonic G3 vs Pentax 645D Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Portrait photography with Panasonic G3
Portrait photography with Pentax 645D
70
manual focus
megapixel count good (16 megapixels)
decent sensor size (Four Thirds)
comes with face detect focusing
saves RAW formats
77
you can focus manually
sensor resolution is amazing (40 megapixels)
big sensor size (Medium format)
exports RAW files
no liveview
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Street Comparison

Panasonic G3 Street photography highlights
Pentax 645D Street photography highlights
75
screen can move to multiple angles
decent sensor size (Four Thirds)
saves RAW formats
provides touch to focus
lack of image stabilization
58
big sensor size (Medium format)
exports RAW files
weather proofing
fixed screen
does not have image stabilization
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Sports Comparison

Panasonic G3 Sports photography details
Pentax 645D Sports photography details
46
megapixel count good (16MP)
decent sensor size (Four Thirds)
comes with tracking focus
low fps (4.0 frames per second)
lack of image stabilization
low battery (270 shots)
has no phase detect AF
63
sensor resolution is amazing (40 megapixels)
big sensor size (Medium format)
weather proofing
has phase detect AF
no liveview
slow continuous shooting (1.0 fps)
does not have image stabilization
not so great battery power (800 shots)
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Travel Comparison

Travel photography with Panasonic G3
Travel photography with Pentax 645D
70
provides touch to focus
megapixel count good (16MP)
built-in flash
display is selfie friendly
doesn't have Time Lapse function
low battery (270 shots)
55
weather proofing
sensor resolution is amazing (40MP)
not so great battery power (800 shots)
screen isn't selfie friendly
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Landscape Comparison

Panasonic G3 Landscape photography features
Pentax 645D Landscape photography features
62
manual focus
switch lenses (Micro Four Thirds mount)
nice screen size (3 inch)
megapixel count good (16 megapixels)
decent sensor size (Four Thirds)
saves RAW formats
lack of image stabilization
low battery (270 CIPA)
doesn't have Time Lapse function
72
you can focus manually
change lenses (Pentax 645AF2 mount)
screen size is good (3 inch)
sensor resolution is amazing (40 megapixels)
big sensor size (Medium format)
no anti aliasing filter
exports RAW files
weather proofing
2 card slots
no liveview
does not have image stabilization
not so great battery power (800 per charge)
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Vlogging Comparison

Panasonic G3 Vlogging info
Pentax 645D Vlogging info
70
display is selfie friendly
touchscreen functionality
comes with face detect focusing
great video quality (1920 x 1080 resolution)
lack of image stabilization
doesn't have mic port
9
no video shooting
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Panasonic G3 vs Pentax 645D Specifications

Detailed spec comparison table for Panasonic G3 and Pentax 645D
 Panasonic Lumix DMC-G3Pentax 645D
General Information
Manufacturer Panasonic Pentax
Model Panasonic Lumix DMC-G3 Pentax 645D
Type Entry-Level Mirrorless Pro DSLR
Announced 2011-07-11 2010-03-10
Physical type SLR-style mirrorless Large SLR
Sensor Information
Processor Venus Engine FHD Prime II
Sensor type CMOS CCD
Sensor size Four Thirds Medium format
Sensor dimensions 17.3 x 13mm 44 x 33mm
Sensor surface area 224.9mm² 1,452.0mm²
Sensor resolution 16MP 40MP
Anti aliasing filter
Aspect ratio 1:1, 4:3, 3:2 and 16:9 4:3
Full resolution 4592 x 3448 7264 x 5440
Max native ISO 6400 1600
Minimum native ISO 160 200
RAW support
Minimum boosted ISO - 100
Autofocusing
Focus manually
Autofocus touch
Continuous autofocus
Single autofocus
Tracking autofocus
Selective autofocus
Autofocus center weighted
Autofocus multi area
Autofocus live view
Face detection autofocus
Contract detection autofocus
Phase detection autofocus
Number of focus points 23 11
Lens
Lens mount Micro Four Thirds Pentax 645AF2
Available lenses 107 6
Crop factor 2.1 0.8
Screen
Type of screen Fully Articulated Fixed Type
Screen sizing 3" 3"
Resolution of screen 460 thousand dots 921 thousand dots
Selfie friendly
Liveview
Touch operation
Screen technology TFT Color LCD with wide-viewing angle TFT Color LCD with wide-viewing angle and with AR coating
Viewfinder Information
Viewfinder type Electronic Optical (pentaprism)
Viewfinder resolution 1,440 thousand dots -
Viewfinder coverage 100% 98%
Viewfinder magnification 0.7x 0.85x
Features
Lowest shutter speed 60 secs 30 secs
Highest shutter speed 1/4000 secs 1/4000 secs
Continuous shooting rate 4.0 frames/s 1.0 frames/s
Shutter priority
Aperture priority
Manual mode
Exposure compensation Yes Yes
Custom white balance
Image stabilization
Built-in flash
Flash range 11.00 m no built-in flash
Flash settings Auto, On, Off, Red-Eye, Slow Sync Auto, On, Off, Red-eye, Slow Sync, Rear Curtain
Hot shoe
AEB
WB bracketing
Highest flash synchronize 1/160 secs 1/125 secs
Exposure
Multisegment
Average
Spot
Partial
AF area
Center weighted
Video features
Video resolutions 1920 x 1080 (60fps) 1280 x 720 (60, 30 fps), 640 x 480 (30fps), 320 x 240 (30fps)) -
Max video resolution 1920x1080 None
Video format AVCHD, Motion JPEG -
Mic support
Headphone support
Connectivity
Wireless None None
Bluetooth
NFC
HDMI
USB USB 2.0 (480 Mbit/sec) USB 2.0 (480 Mbit/sec)
GPS None None
Physical
Environment sealing
Water proof
Dust proof
Shock proof
Crush proof
Freeze proof
Weight 336 gr (0.74 lbs) 1480 gr (3.26 lbs)
Dimensions 115 x 84 x 47mm (4.5" x 3.3" x 1.9") 156 x 117 x 119mm (6.1" x 4.6" x 4.7")
DXO scores
DXO All around score 56 82
DXO Color Depth score 21.0 24.6
DXO Dynamic range score 10.6 12.6
DXO Low light score 667 1262
Other
Battery life 270 images 800 images
Battery style Battery Pack Battery Pack
Battery model - D-LI90
Self timer Yes (2 or 10 sec) Yes (2 or 10 sec)
Time lapse shooting
Type of storage SD/SDHC/SDXC SD/SDHC
Card slots 1 Two
Cost at launch $500 $4,000