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 Ricoh G900 and Pentax 645D side-by-side from the front, back and top in their relative dimensions. Ricoh G900 has external dimensions of 118 x 66 x 33 mm (4.65 x 2.6 x 1.3″) and weighs 247 g (0.54 lb / 8.71 oz) (including batteries). Pentax 645D has external dimensions of 156 x 117 x 119 mm (6.14 x 4.61 x 4.69″) and weighs 1480 g (3.26 lb / 52.21 oz) (including batteries).
Below you can see the front view size comparison of Ricoh G900 and Pentax 645D. Ricoh G900 is clearly the smaller of the two cameras. Its body is 38mm narrower, 51mm shorter and 86mm thinner than Pentax 645D. As you can tell, actually this is not a fair size comparison since Ricoh G900 has a built-in lens but Pentax 645D doesn't. Once you put a lens on 645D, its thickness will increase significantly.
![Ricoh G900 vs Pentax 645D Camera Size Comparison - Front View]()
Comparison image of Ricoh G900 and Pentax 645D Size, Weight and External Dimensions - Front View
Here is the back view size comparison of Ricoh G900 and Pentax 645D.
![Ricoh G900 vs Pentax 645D Camera Size Comparison - Back View]()
Comparison image of Ricoh G900 and Pentax 645D Size and Weight - Back View
Now lets look at the top view comparison of Ricoh G900 and Pentax 645D.
![Ricoh G900 vs Pentax 645D Camera Size Comparison - Top View]()
Top View Comparison image of Ricoh G900 and Pentax 645D Size
Weight is another important factor especially when deciding on a camera that you want to carry with you all day.
Ricoh G900 is significantly lighter (1233g ) than the Pentax 645D which may become a big advantage especially on long walking trips.
Again, this comparison may not be very useful in real life as we are comparing the weight of a camera with a built-in lens to the body-only weight of an interchangeable lens camera. Once you put a lens on 645D, the total kit will weigh much higher.
Weather Sealing
LCD Screen Size and Features
Ricoh G900 and Pentax 645D's LCD screens has the same diagonal size of 3".
Unfortunately, both cameras has fixed screens so they don't tilt or flip in directions.
Ricoh G900 has a 20.0MP 1/2.3" (6.17 x 4.55 mm ) sized BSI-CMOS sensor . On the other hand, Pentax 645D has a 40.0MP Medium format (44 x 33 mm ) sized CCD sensor and features Prime II processor.
Pentax 645D's sensor provides 20MP more than Ricoh G900's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
One other difference between these two cameras that is worth mentioning is that Pentax 645D's sensor doesn't have an anti-alias (Low-Pass) filter. Removing anti-alias filter increases the sharpness and level of detail but at the same time, it increases the chance of moire occurring in certain scenes.
Below you can see the G900 and 645D sensor size comparison.
![Ricoh G900 vs Pentax 645D Sensor Size Comparison]()
Sensor Size and Resolution Comparison image of Ricoh G900 and Pentax 645D Cameras
As seen above, Pentax 645D has a 51.7x Larger sensor area than Ricoh G900. 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.
In this section, we rank and compare Ricoh G900 and Pentax 645D 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.
Ricoh G900 for Portrait Photography
Pentax 645D for Portrait Photography
Very High Resolution Sensor: 20.0MP
Image Stabilization
Small 1/2.3" (6.17 x 4.55 mm) sensor
No RAW shooting capability
No External Flash Shoe
No Built-in Viewfinder
No Manual Exposure Mode
Not so good Ergonomics&Handling
Read the details
Large Medium format (44 x 33 mm) sensor
Very High Resolution Sensor: 40.0MP
Optical Built-in Viewfinder
Good Ergonomics&Handling
No Image Stabilization
Read the details
Ricoh G900 for Street Photography
Pentax 645D for Street Photography
Image Stabilization
Small Body
Live-view
Face-Detection Focusing
28 mm - Good Wide Angle Coverage
Small 1/2.3" (6.17 x 4.55 mm) sensor
No RAW shooting capability
No Built-in Viewfinder
Read the details
Large Medium format (44 x 33 mm) sensor
Optical Built-in Viewfinder
No Image Stabilization
No Live-view
Large Body
Read the details
Ricoh G900 for Sports Photography
Pentax 645D for Sports Photography
Image Stabilization
Environmental Sealings
Fast Max shutter speed: 1/4000s
140 mm Tele Lens
No RAW shooting capability
No External Flash Shoe
No Built-in Viewfinder
No Manual Exposure Mode
Not so good Ergonomics&Handling
9 Focus Points
Read the details
Optical Built-in Viewfinder
Good Ergonomics&Handling
Environmental Sealings
Fast Max shutter speed: 1/4000s
11 Focus Points
Good Battery Life: 800 shots
Good Low Light ISO
No Image Stabilization
Slow Continuous Shooting: 1.0fps
Read the details
Ricoh G900 for Daily Photography
Pentax 645D for Daily Photography
Compact Body
Environmental Sealings
247g
5.0X Optical Zoom
Small 1/2.3" (6.17 x 4.55 mm) sensor
No RAW shooting capability
Read the details
Large Medium format (44 x 33 mm) sensor
Environmental Sealings
Large Body
1480g
Body Thickness 119mm
Read the details
Ricoh G900 for Landscape Photography
Pentax 645D for Landscape Photography
Very High Resolution Sensor: 20.0MP
28 mm - Good Wide Angle Coverage
Environmental Sealings
Small 1/2.3" (6.17 x 4.55 mm) sensor
No RAW shooting capability
No Manual Exposure Mode
Read the details
Large Medium format (44 x 33 mm) sensor
Very High Resolution Sensor: 40.0MP
Environmental Sealings
No Live-view
Read the details
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 Ricoh G900 and Pentax 645D, 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 Ricoh G900 and Pentax 645D scores compare:
Ricoh G900
Ranked
#71 out of 475 in Compact cameras
Ranked
#508 out of 1218 in all Cameras
Pentax 645D
Ranked
#14 out of 36 in Large SLR cameras
Ranked
#286 out of 1218 in all Cameras
Pentax 645D scores higher than the Ricoh G900 in Overall. It has better image quality and better value than Ricoh G900. On the other hand, Ricoh G900 is more portable and has more features than Pentax 645D.
If image quality is very important for you and you want to get the most bang for your bucks, choose the Pentax 645D.
If you are looking for a small camera where you can take everywhere with you, and having more features are also important, Ricoh G900 is the right choice for you.
| General |
Ricoh G900 |
Pentax 645D |
| Brand |
Ricoh |
Pentax |
| Announced |
2018-02-21 |
2010-03-10 |
| Body Type |
Compact |
Large SLR |
Sensor |
|
|
| Type |
BSI-CMOS |
CCD |
| Size |
1/2.3" |
Medium format |
| Dimensions |
6.17 x 4.55 mm |
44 x 33 mm |
| Area |
28.07mm2 |
1452.00mm2 |
| Megapixels |
20 megapixels |
40 megapixels |
| Max Resolution |
5184 x 3888 |
7264 x 5440 |
| Max Native Light sensitivity |
6,400 ISO |
1,600 ISO |
| Min Native Light sensitivity |
125 ISO |
200 ISO |
| Min Boosted Light Sensitivity |
- |
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 |
9 |
11 |
Lens |
|
|
| Manual Focus |
|
|
| Lens Mount |
fixed lens |
Pentax 645AF2 |
| Lens Focal Range |
28-140 mm (5x) |
no lens |
| Max Aperture |
F3.5-5.5 |
no lens |
| Macro Focus Range |
1cm |
no lens |
Screen |
|
|
| Type |
Fixed type |
Fixed type |
| Size |
3" |
3" |
| Resolution |
1,040k dots |
921k dots |
| Touch Screen |
|
|
Viewfinder |
|
|
| Viewfinder |
None |
Optical (pentaprism) |
| Viewfinder Coverage |
n/a |
98% |
| Viewfinder Magnification |
n/a |
0.85x |
Photography Features |
|
|
| Max Mechanical Shutter |
1/4000s |
1/4000s |
| Shutter Priority |
|
|
| Aperture Priority |
|
|
| Manual Exposure Mode |
|
|
| Custom White Balance |
|
|
| Image Stabilization |
Digital only |
No |
| Built-in Flash |
|
|
| Flash Range |
5.50 m (with Auto ISO) |
no built-in flash |
| Max Flash Sync |
n/a |
1/125s |
| External Flash |
|
|
| Continuous Shooting |
n/a |
1.0 fps |
| Multi-Segment |
|
|
| Average |
|
|
| Spot |
|
|
| Partial |
|
|
| AF-Area |
|
|
| Center Weighted |
|
|
| AE Bracketing |
|
|
| WB Bracketing |
|
|
Video Features |
|
|
| Max Video Resolution |
3840x2160 |
None |
| Video Formats |
MPEG-4, H.264 |
n/a |
| Microphone Port |
|
|
| Headphone Port |
|
|
Connectivity |
|
|
| Wireless Connectivity |
Supports FlashAir SD cards |
None |
| HDMI |
|
|
Physical |
|
|
| Environmental Sealing |
|
|
| Weight |
247g |
1480g |
| Dimensions |
118 x 66 x 33mm |
156 x 117 x 119mm |
| Battery Life |
340 shots |
800 shots |
Other Features |
|
|
| Timelapse Recording |
|
|
| GPS |
Built-in |
None |
DxO Sensor Scores |
|
|
| DxO Overall Score |
not tested |
82 |
| DxO Color Depth |
not tested |
24.6 |
| DxO Dynamic Range |
not tested |
12.6 |
| DxO Low Light ISO |
not tested |
1262 |
|
Report a correction |
Report a correction |