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Compare Pentax K-S1 vs Pentax 645D vs Pentax K-3 Mark III

Connectivity

Ports
HDMI + Remote Control + USB 2.0
Remote Control + USB 2.0
HDMI + Headphone + Microphone + Remote Control + USB 3.2 Gen 1
Wireless Connectivity
802.11b/g/n + Bluetooth

Construction

Form Factor
DSLR camera
DSLR camera
Image Size
APS-C (23.5 x 15.6 mm)
Medium format (645)
APS-C (23 x 15.5 mm)
Lens Mount
Pentax K-mount
Pentax K-mount
Microphone
Stereo
Stereo
Stereo
Sensor | Resolution
20 MP (5472 x 3648)
40 MP (7264 x 5440)
26 MP (6192 x 4128)
Sensor | Type
CMOS
CCD
CMOS
Speakers
Mono
None
Mono

Dimensions

Size | Depth
70 mm / 2.76 in
119 mm / 4.69 in
74 mm / 2.91 in
Size | Height
93 mm / 3.66 in
117 mm / 4.61 in
104 mm / 4.09 in
Size | Width
121 mm / 4.76 in
156 mm / 6.14 in
135 mm / 5.31 in
Weight
558 g / 19.72 oz
1480 g / 52.30 oz
820 g / 28.98 oz

Display

Display Diagonal
3 inch
3 inch
3.2 inch
Display Type
Fixed TFT-LCD
Fixed TFT Color LCD with wide-viewing angle and with AR coating
Fixed TFT LCD
Resolution
921,000 dots
921,000 dots
1,620,000 dots
Viewfinder | Coverage
100%
98%
100%
Viewfinder | Magnification
0.95x
0.85x
1.05x
Viewfinder | Type
Optical (pentaprism)
Optical (pentaprism)
Optical (pentaprism)

Function

AE Bracketing
±3 (3 frames at 1/3 EV, 1/2 EV steps)
±2 (3, 5 frames at 1/7 EV, 1/5 EV, 1/3 EV, 1/2 EV, 2/3 EV, 1 EV steps)
±5 (2, 3, 5 frames at 1/3 EV, 1/2 EV steps)
Autofocus
11 focus points
11 focus points
101 focus points (25 cross type)
Crop Factor
1.5
0.6
1.5
Exposure Compensation
±5 (at 1/3 EV, 1/2 EV steps)
±5 (at 1/3 EV, 1/2 EV steps)
±5 (at 1/3 EV, 1/2 EV steps)
Exposure Mode
Auto / Aperture Priority / Shutter Priority / Manual
Auto / Aperture Priority / Shutter Priority / Manual
Auto / Aperture Priority / Shutter Priority / Manual
Flash
Built-in
GPS
Optional O-GPS-1
No
No
ISO Range
100 ~ 51200
200, 400, 800, 1600 (100 with boost)
(100 ~ 1600000)
Image Stabilization
3-axis
No
5.5 stops
Intervalometer
Yes
Yes
Processor
Prime MII
Prime II
PRIME V
Touch Screen
No
No
Yes
Video Codecs
H.264
MPEG-4, H.264
Weather Resistance
No
Yes
Yes

Performance

Battery Life
410 shots
800 shots
Flash Range
10.00 m
Max Burst Rate
5.4 fps
1.1 fps
12.0 fps
Storage
SD/SDHC/SDXC
SD/SDHC
Dual SD/SDHC/SDXC slots (UHS-II supported in slot 1)

Production

Battery
D-LI109 lithium-ion battery and charger
Lithium-Ion D-LI90 rechargeable battery & charger
D-LI90
Debut
2014-08-27
2010-03-10
2021-03-30

Reviews

Neofiliac score
50%
57%
69%
Pros
  • Rather compact
  • Medium format look
  • Weather-sealed
  • Affordable for a 645 DSLR
  • Exceptional battery life
  • 5.5 stops of IBIS
  • Good 12.0 fps burst rate
  • Weather-sealed
  • Viewfinder with great 1.05x magnification
  • Supports both WiFi and Bluetooth
Cons
  • Menu not touch-enabled
  • Low 5.4 fps burst rate
  • Low 20 MP resolution
  • Lacks weather sealing
  • Tacky design
  • Menu not touch-enabled
  • Very low 1.1 fps burst rate
  • Very large in size
  • Very heavy
  • Viewfinder coverage is cropped at 98%
  • Quite heavy

Price

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