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Nikon S640 vs Pentax K-x

Portability
96
Imaging
35
Features
24
Overall
30
Nikon Coolpix S640 front
 
Pentax K-x front
Portability
69
Imaging
52
Features
47
Overall
50

Nikon S640 vs Pentax K-x Key Specs

Nikon S640
(Full Review)
  • 12MP - 1/2.3" Sensor
  • 2.7" Fixed Screen
  • ISO 100 - 6400
  • Optical Image Stabilization
  • 1/8000s Max Shutter
  • 1280 x 720 video
  • 28-140mm (F2.7-6.6) lens
  • 130g - 91 x 55 x 21mm
  • Announced August 2009
Pentax K-x
(Full Review)
  • 12MP - APS-C Sensor
  • 2.7" Fixed Display
  • ISO 100 - 6400 (Boost to 12800)
  • Sensor based Image Stabilization
  • 1/6000s Max Shutter
  • 1280 x 720 video
  • Pentax KAF2 Mount
  • 580g - 123 x 92 x 68mm
  • Released December 2009
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Nikon S640 vs Pentax K-x Overview

In this write-up, we are matching up the Nikon S640 versus Pentax K-x, one being a Small Sensor Compact and the other is a Entry-Level DSLR by brands Nikon and Pentax. The image resolution of the S640 (12MP) and the K-x (12MP) is fairly well matched but the S640 (1/2.3") and K-x (APS-C) use different sensor sizing.

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The S640 was manufactured 4 months prior to the K-x which means that they are both of a similar generation. Both cameras offer different body type with the Nikon S640 being a Compact camera and the Pentax K-x being a Compact SLR camera.

Before diving through a more detailed comparison, below is a brief introduction of how the S640 scores against the K-x with regard to portability, imaging, features and an overall rating.

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Reasons to pick Nikon S640 over the Pentax K-x

 S640 K-x 

Reasons to pick Pentax K-x over the Nikon S640

 K-x S640 
Manual focus Dial exact focusing

Common features in the Nikon S640 and Pentax K-x

 S640 K-x 
ReleasedAugust 2009December 2009Similar generation
Display typeFixed Fixed Fixed display
Display sizing2.7"2.7"Equivalent display measurement
Display resolution230k230kSame display resolution
Selfie screen Neither features selfie screen
Touch friendly display Neither features Touch friendly display

Nikon S640 vs Pentax K-x Physical Comparison

In case you're going to carry your camera regularly, you should factor in its weight and dimensions. The Nikon S640 enjoys outside measurements of 91mm x 55mm x 21mm (3.6" x 2.2" x 0.8") accompanied by a weight of 130 grams (0.29 lbs) while the Pentax K-x has dimensions of 123mm x 92mm x 68mm (4.8" x 3.6" x 2.7") with a weight of 580 grams (1.28 lbs).

Analyze the Nikon S640 versus Pentax K-x in the latest Camera with Lens Size Comparison Tool. Camera Size Comparison with Lenses

Do not forget, the weight of an Interchangeable Lens Camera will differ depending on the lens you use at the time. Here is the front view scale comparison of the S640 against the K-x.

Nikon S640 vs Pentax K-x size comparison

Using size and weight, the portability rating of the S640 and K-x is 96 and 69 respectively.

Nikon S640 vs Pentax K-x top view buttons comparison

Nikon S640 vs Pentax K-x Sensor Comparison

Generally, it can be tough to imagine the contrast between sensor sizing merely by looking at a spec sheet. The graphic below will help give you a clearer sense of the sensor measurements in the S640 and K-x.

As you can see, both the cameras offer the same exact resolution but different sensor sizing. The S640 provides the tinier sensor which is going to make getting bokeh tougher.

Nikon S640 vs Pentax K-x sensor size comparison

Nikon S640 vs Pentax K-x Screen and ViewFinder

Nikon S640 vs Pentax K-x Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Nikon S640 Portrait photography features
Pentax K-x Portrait photography features
21
manual focus not available
no manual control
can't use external flash
megapixel count low (12MP)
very small sensor size (1/2.3")
lacks RAW files
63
manual focus
decent sensor size (APS-C)
offers face detection focus
supports RAW formats
MP count low (12 megapixels)
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Street Comparison

Street photography with Nikon S640
Street photography with Pentax K-x
63
has image stabilization (Optical)
lighter than competition (130 grams)
fixed screen
very small sensor size (1/2.3")
lacks RAW files
67
image stabilization (Sensor based)
decent sensor size (APS-C)
supports RAW formats
fixed screen
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Sports Comparison

Sports photography with Nikon S640
Sports photography with Pentax K-x
34
great max shutter speed (1/8,000s)
has image stabilization (Optical)
lack of shutter priority mode
megapixel count low (12 megapixels)
very small sensor size (1/2.3")
lacks phase detect AF
61
great max shutter speed (1/6,000 seconds)
image stabilization (Sensor based)
decent sensor size (APS-C)
good battery pack (1,900 per charge)
supports phase detect auto focus
very slow continuous shooting (5.0 frames per second)
MP count low (12 megapixels)
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Travel Comparison

Nikon S640 Travel photography advice
Pentax K-x Travel photography advice
62
lighter than competition (130g)
has built in flash
fairly wide (28mm)
doesn't have Timelapse function
megapixel count low (12MP)
doesn't feature selfie friendly display
sluggish maximum aperture (f2.7)
54
good battery pack (1,900 shots)
built-in flash
does not have Time Lapse mode
MP count low (12 megapixels)
does not contain selfie friendly screen
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Landscape Comparison

Nikon S640 Landscape photography advice
Pentax K-x Landscape photography advice
32
fairly wide (28mm)
has image stabilization (Optical)
manual focus not available
fixed lens (fixed lens mount)
sluggish maximum aperture (f2.7)
small screen (2.7 inches)
no manual control
megapixel count low (12 megapixels)
very small sensor size (1/2.3")
lacks RAW files
doesn't have Timelapse function
61
manual focus
swap lenses (Pentax KAF2 mount)
image stabilization (Sensor based)
decent sensor size (APS-C)
supports RAW formats
good battery pack (1,900 per charge)
screen is somewhat small (2.7 inches)
MP count low (12 megapixels)
does not have Time Lapse mode
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Vlogging Comparison

Nikon S640 Vlogging highlights
Pentax K-x Vlogging highlights
31
fairly wide (28mm)
has image stabilization (Optical)
lighter than competition (130 grams)
sluggish maximum aperture (f2.7)
doesn't feature selfie friendly display
low video resolution (1280 x 720 pixels)
doesn't have microphone port
27
image stabilization (Sensor based)
offers face detection focus
does not contain selfie friendly screen
video quality not great (1280 x 720 resolution)
does not have external mic port
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Nikon S640 vs Pentax K-x Specifications

Detailed spec comparison table for Nikon S640 and Pentax K-x
 Nikon Coolpix S640Pentax K-x
General Information
Company Nikon Pentax
Model type Nikon Coolpix S640 Pentax K-x
Category Small Sensor Compact Entry-Level DSLR
Announced 2009-08-04 2009-12-23
Body design Compact Compact SLR
Sensor Information
Powered by Expeed Prime
Sensor type CCD CMOS
Sensor size 1/2.3" APS-C
Sensor dimensions 6.08 x 4.56mm 23.6 x 15.8mm
Sensor area 27.7mm² 372.9mm²
Sensor resolution 12 megapixels 12 megapixels
Anti alias filter
Aspect ratio 4:3 and 16:9 3:2
Max resolution 4000 x 3000 4288 x 2848
Max native ISO 6400 6400
Max enhanced ISO - 12800
Minimum native ISO 100 100
RAW pictures
Autofocusing
Focus manually
Touch to focus
Autofocus continuous
Autofocus single
Tracking autofocus
Selective autofocus
Autofocus center weighted
Multi area autofocus
Autofocus live view
Face detection autofocus
Contract detection autofocus
Phase detection autofocus
Total focus points - 11
Lens
Lens support fixed lens Pentax KAF2
Lens zoom range 28-140mm (5.0x) -
Maximum aperture f/2.7-6.6 -
Macro focusing distance 2cm -
Number of lenses - 151
Crop factor 5.9 1.5
Screen
Screen type Fixed Type Fixed Type
Screen diagonal 2.7 inches 2.7 inches
Screen resolution 230k dot 230k dot
Selfie friendly
Liveview
Touch operation
Screen technology - TFT LCD monitor
Viewfinder Information
Viewfinder type None Optical (pentamirror)
Viewfinder coverage - 96 percent
Viewfinder magnification - 0.57x
Features
Min shutter speed 30 secs 30 secs
Max shutter speed 1/8000 secs 1/6000 secs
Continuous shutter speed - 5.0fps
Shutter priority
Aperture priority
Manually set exposure
Exposure compensation - Yes
Change white balance
Image stabilization
Inbuilt flash
Flash distance - 16.00 m
Flash modes - Auto, On, Off, Red-Eye, Slow Sync, Rear curtain, Wireless
External flash
AEB
WB bracketing
Max flash sync - 1/180 secs
Exposure
Multisegment exposure
Average exposure
Spot exposure
Partial exposure
AF area exposure
Center weighted exposure
Video features
Video resolutions 1280 x 720 (30 fps), 640 x 480 (30 fps), 320 x 240 (30 fps) 1280 x 720 (24 fps), 640 x 416 (24 fps)
Max video resolution 1280x720 1280x720
Video format Motion JPEG Motion JPEG
Mic jack
Headphone jack
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 seal
Water proofing
Dust proofing
Shock proofing
Crush proofing
Freeze proofing
Weight 130 gr (0.29 lbs) 580 gr (1.28 lbs)
Dimensions 91 x 55 x 21mm (3.6" x 2.2" x 0.8") 123 x 92 x 68mm (4.8" x 3.6" x 2.7")
DXO scores
DXO Overall rating not tested 72
DXO Color Depth rating not tested 22.8
DXO Dynamic range rating not tested 12.5
DXO Low light rating not tested 811
Other
Battery life - 1900 images
Battery form - Battery Pack
Battery ID EN-EL12 4 x AA
Self timer Yes Yes (2 or 12 sec)
Time lapse feature
Type of storage SD/SDHC, Internal SD/SDHC card
Storage slots Single Single
Launch price $225 $600