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Pentax 645D vs Ricoh G900

Portability
50
Imaging
76
Features
52
Overall
66
Pentax 645D front
 
Ricoh G900 front
Portability
89
Imaging
47
Features
46
Overall
46

Pentax 645D vs Ricoh G900 Key Specs

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
  • Launched March 2010
  • Newer Model is Pentax 645Z
Ricoh G900
(Full Review)
  • 20MP - 1/2.3" Sensor
  • 3" Fixed Display
  • ISO 125 - 6400
  • Digital Image Stabilization
  • 3840 x 2160 video
  • 28-140mm (F3.5-5.5) lens
  • 247g - 118 x 66 x 33mm
  • Revealed February 2018
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Pentax 645D vs Ricoh G900 Overview

Let's look a little more in depth at the Pentax 645D vs Ricoh G900, former is a Pro DSLR while the other is a Waterproof by manufacturers Pentax and Ricoh. There is a substantial difference among the image resolutions of the 645D (40MP) and G900 (20MP) and the 645D (Medium format) and G900 (1/2.3") come with different sensor sizing.

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The 645D was brought out 9 years prior to the G900 which is a fairly big difference as far as camera tech is concerned. Both cameras offer different body type with the Pentax 645D being a Large SLR camera and the Ricoh G900 being a Compact camera.

Before we go straight into a in-depth comparison, below is a concise synopsis of how the 645D grades against the G900 in the way of portability, imaging, features and an overall mark.

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Reasons to pick Pentax 645D over the Ricoh G900

 645D G900 

Reasons to pick Ricoh G900 over the Pentax 645D

 G900 645D 
RevealedFebruary 2018March 2010Newer by 96 months
Display resolution1040k921kSharper display (+119k dot)

Common features in the Pentax 645D and Ricoh G900

 645D G900 
Manually focus More exact focusing
Display typeFixed Fixed Fixed display
Display sizing3"3"Equivalent display measurement
Selfie screen Lacking selfie screen
Touch friendly display Neither has Touch friendly display

Pentax 645D vs Ricoh G900 Physical Comparison

In case you're going to travel with your camera regularly, you will have to think about its weight and dimensions. The Pentax 645D has outside measurements of 156mm x 117mm x 119mm (6.1" x 4.6" x 4.7") accompanied by a weight of 1480 grams (3.26 lbs) while the Ricoh G900 has dimensions of 118mm x 66mm x 33mm (4.6" x 2.6" x 1.3") accompanied by a weight of 247 grams (0.54 lbs).

See the Pentax 645D vs Ricoh G900 in our brand new Camera & Lens Size Comparison Tool. Camera Size Comparison with Lenses

Always remember, the weight of an ILC will differ depending on the lens you are working with at that moment. Underneath is the front view dimensions comparison of the 645D against the G900.

Pentax 645D vs Ricoh G900 size comparison

Taking into account size and weight, the portability grade of the 645D and G900 is 50 and 89 respectively.

Pentax 645D vs Ricoh G900 top view buttons comparison

Pentax 645D vs Ricoh G900 Sensor Comparison

In many cases, it is difficult to visualize the contrast in sensor dimensions merely by going through specs. The pic here will help provide you a better sense of the sensor measurements in the 645D and G900.

All in all, both of the cameras offer different megapixel count and different sensor dimensions. The 645D due to its larger sensor is going to make achieving shallow DOF easier and the Pentax 645D will show greater detail having its extra 20MP. Greater resolution will also allow you to crop photos a little more aggressively. The more aged 645D will be behind in sensor tech.

Pentax 645D vs Ricoh G900 sensor size comparison

Pentax 645D vs Ricoh G900 Screen and ViewFinder

Pentax 645D vs Ricoh G900 Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Portrait photography with Pentax 645D
Portrait photography with Ricoh G900
77
focusing manually
great MP (40 megapixels)
sensor size is great (Medium format)
delivers RAW formats
no liveview
45
focusing manually
good resolution (20MP)
features face detection focusing
no manual mode
cannot use external flash
tiny sensor size (1/2.3")
lack of RAW format
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Street Comparison

Pentax 645D Street photography information
Ricoh G900 Street photography information
58
sensor size is great (Medium format)
delivers RAW formats
weather sealing
no articulating screen
no image stabilization
60
has image stabilization (Digital)
weather proofing
fixed screen
tiny sensor size (1/2.3")
lack of RAW format
heavier than competitors (247 grams)
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Sports Comparison

Pentax 645D Sports photography factors
Ricoh G900 Sports photography factors
63
great MP (40 megapixels)
sensor size is great (Medium format)
weather sealing
supports phase detect auto focus
no liveview
slow continuous shooting (1.0 frames per second)
no image stabilization
terrible battery life (800 CIPA)
54
has image stabilization (Digital)
good resolution (20MP)
features tracking autofocus
weather proofing
great battery (340 shots)
no shutter priority mode
tiny sensor size (1/2.3")
lack of phase detect AF
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Travel Comparison

Travel photography with Pentax 645D
Travel photography with Ricoh G900
55
weather sealing
great MP (40MP)
terrible battery life (800 per charge)
does not contain selfie friendly display
70
great battery (340 CIPA)
weather proofing
good resolution (20 megapixels)
flash built-in
quite wide (28mm)
heavier than competitors (247g)
doesn't have selfie friendly display
slow maximum aperture (f3.5)
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Landscape Comparison

Pentax 645D Landscape photography info
Ricoh G900 Landscape photography info
72
focusing manually
interchangeable lenses (Pentax 645AF2 mount)
screen size is good (3")
great MP (40 megapixels)
sensor size is great (Medium format)
doesnt have anti-alias filter
delivers RAW formats
weather sealing
has double storage slots
no liveview
no image stabilization
terrible battery life (800 CIPA)
56
focusing manually
quite wide (28mm)
screen size is good (3")
has image stabilization (Digital)
good resolution (20MP)
weather proofing
great battery (340 CIPA)
fixed lens (fixed lens mount)
slow maximum aperture (f3.5)
no manual mode
tiny sensor size (1/2.3")
lack of RAW format
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Vlogging Comparison

Pentax 645D as a Vlogging camera
Ricoh G900 as a Vlogging camera
9
can't shoot video
32
quite wide (28mm)
has image stabilization (Digital)
features face detection focusing
great video quality (3840 x 2160 resolution)
slow maximum aperture (f3.5)
doesn't have selfie friendly display
does not have external mic port
heavier than competitors (247g)
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Pentax 645D vs Ricoh G900 Specifications

Detailed spec comparison table for Pentax 645D and Ricoh G900
 Pentax 645DRicoh G900
General Information
Brand Pentax Ricoh
Model type Pentax 645D Ricoh G900
Type Pro DSLR Waterproof
Launched 2010-03-10 2018-02-21
Body design Large SLR Compact
Sensor Information
Chip Prime II -
Sensor type CCD BSI-CMOS
Sensor size Medium format 1/2.3"
Sensor dimensions 44 x 33mm 6.17 x 4.55mm
Sensor surface area 1,452.0mm² 28.1mm²
Sensor resolution 40MP 20MP
Anti alias filter
Aspect ratio 4:3 1:1, 4:3 and 3:2
Full resolution 7264 x 5440 5184 x 3888
Max native ISO 1600 6400
Lowest native ISO 200 125
RAW pictures
Lowest boosted ISO 100 -
Autofocusing
Focus manually
Touch focus
AF continuous
AF single
Tracking AF
AF selectice
AF center weighted
Multi area AF
Live view AF
Face detect AF
Contract detect AF
Phase detect AF
Total focus points 11 9
Lens
Lens mount type Pentax 645AF2 fixed lens
Lens zoom range - 28-140mm (5.0x)
Highest aperture - f/3.5-5.5
Macro focusing range - 1cm
Amount of lenses 6 -
Crop factor 0.8 5.8
Screen
Range of display Fixed Type Fixed Type
Display sizing 3 inches 3 inches
Resolution of display 921k dot 1,040k dot
Selfie friendly
Liveview
Touch friendly
Display technology TFT Color LCD with wide-viewing angle and with AR coating -
Viewfinder Information
Viewfinder Optical (pentaprism) None
Viewfinder coverage 98 percent -
Viewfinder magnification 0.85x -
Features
Slowest shutter speed 30 seconds 4 seconds
Maximum shutter speed 1/4000 seconds 1/4000 seconds
Continuous shooting speed 1.0fps -
Shutter priority
Aperture priority
Manually set exposure
Exposure compensation Yes -
Custom WB
Image stabilization
Built-in flash
Flash distance no built-in flash 5.50 m (with Auto ISO)
Flash settings Auto, On, Off, Red-eye, Slow Sync, Rear Curtain Flash on, flash off
Hot shoe
Auto exposure bracketing
WB bracketing
Maximum flash sync 1/125 seconds -
Exposure
Multisegment metering
Average metering
Spot metering
Partial metering
AF area metering
Center weighted metering
Video features
Video resolutions - 3840x2160
Max video resolution None 3840x2160
Video format - MPEG-4, H.264
Mic jack
Headphone jack
Connectivity
Wireless None Supports FlashAir SD cards
Bluetooth
NFC
HDMI
USB USB 2.0 (480 Mbit/sec) DB-110 lithium-ion battery & USB charger
GPS None Built-in
Physical
Environment seal
Water proofing
Dust proofing
Shock proofing
Crush proofing
Freeze proofing
Weight 1480 gr (3.26 lb) 247 gr (0.54 lb)
Dimensions 156 x 117 x 119mm (6.1" x 4.6" x 4.7") 118 x 66 x 33mm (4.6" x 2.6" x 1.3")
DXO scores
DXO All around rating 82 not tested
DXO Color Depth rating 24.6 not tested
DXO Dynamic range rating 12.6 not tested
DXO Low light rating 1262 not tested
Other
Battery life 800 images 340 images
Battery form Battery Pack Battery Pack
Battery ID D-LI90 -
Self timer Yes (2 or 10 sec) Yes
Time lapse shooting
Type of storage SD/SDHC Internal + SD/SDHC/SDXC card
Storage slots Dual One
Price at launch $4,000 $752