Pentax 645Z vs Pentax K-S1
49 Imaging
81 Features
74 Overall
78
69 Imaging
64 Features
70 Overall
66
Pentax 645Z vs Pentax K-S1 Key Specs
(Full Review)
- 51MP - Medium format Sensor
- 3.2" Tilting Display
- ISO 100 - 204800
- No Anti-Alias Filter
- 1920 x 1080 video
- Pentax 645AF2 Mount
- 1550g - 156 x 117 x 123mm
- Released April 2014
- Previous Model is Pentax 645D
(Full Review)
- 20MP - APS-C Sensor
- 3" Fixed Screen
- ISO 100 - 51200
- Sensor based Image Stabilization
- No Anti-Alias Filter
- 1/6000s Maximum Shutter
- 1920 x 1080 video
- Pentax KAF2 Mount
- 558g - 121 x 93 x 70mm
- Released August 2014
- Successor is Pentax K-S2
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In this article, we will be comparing the Pentax 645Z versus Pentax K-S1, former is a Pro DSLR while the latter is a Advanced DSLR and they are both offered by Pentax. There exists a considerable gap among the sensor resolutions of the 645Z (51MP) and K-S1 (20MP) and the 645Z (Medium format) and K-S1 (APS-C) possess different sensor size.
Meta to Introduce 'AI-Generated' Labels for Media starting next monthThe 645Z was revealed 4 months prior to the K-S1 and they are of a similar age. Each of these cameras offer different body type with the Pentax 645Z being a Large SLR camera and the Pentax K-S1 being a Mid-size SLR camera.
Before delving straight into a full comparison, below is a concise summation of how the 645Z matches up versus the K-S1 in regards to portability, imaging, features and an overall score.
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Following is a preview of the gallery images for Pentax 645Z & Pentax K-S1. The full galleries are provided at Pentax 645Z Gallery & Pentax K-S1 Gallery.
Reasons to pick Pentax 645Z over the Pentax K-S1
| 645Z | K-S1 | |||
|---|---|---|---|---|
| Screen type | Tilting |  | Fixed | Tilting screen |
| Screen sizing | 3.2" |  | 3" | Bigger screen (+0.2") |
| Screen resolution | 1037k |  | 921k | Crisper screen (+116k dot) |
Reasons to pick Pentax K-S1 over the Pentax 645Z
| K-S1 | 645Z |
|---|
Common features in the Pentax 645Z and Pentax K-S1
| 645Z | K-S1 | |||
|---|---|---|---|---|
| Released | April 2014 |  | August 2014 | Same age |
| Manually focus |  | Very precise focus | ||
| Selfie screen |  | Neither features selfie screen | ||
| Touch screen |  | Neither features Touch screen |
Pentax 645Z vs Pentax K-S1 Physical Comparison
In case you're planning to carry around your camera frequently, you will have to factor in its weight and dimensions. The Pentax 645Z enjoys outside measurements of 156mm x 117mm x 123mm (6.1" x 4.6" x 4.8") with a weight of 1550 grams (3.42 lbs) while the Pentax K-S1 has dimensions of 121mm x 93mm x 70mm (4.8" x 3.7" x 2.8") with a weight of 558 grams (1.23 lbs).
Check the Pentax 645Z versus Pentax K-S1 in our completely new Camera plus Lens Size Comparison Tool.
Don't forget, the weight of an ILC will vary dependant on the lens you are working with at that time. Following is the front view dimension comparison of the 645Z against the K-S1.
Taking into account dimensions and weight, the portability rating of the 645Z and K-S1 is 49 and 69 respectively.
Pentax 645Z vs Pentax K-S1 Sensor Comparison
Sometimes, it is hard to visualize the contrast in sensor sizes purely by researching technical specs. The pic underneath should give you a far better sense of the sensor sizing in the 645Z and K-S1.
As you have seen, the two cameras enjoy different megapixels and different sensor sizes. The 645Z having a bigger sensor is going to make achieving shallower DOF easier and the Pentax 645Z will result in more detail because of its extra 31 Megapixels. Higher resolution will allow you to crop photographs far more aggressively.
Pentax 645Z vs Pentax K-S1 Screen and ViewFinder
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Pentax 645Z vs Pentax K-S1 Specifications
| Pentax 645Z | Pentax K-S1 | |
|---|---|---|
| General Information | ||
| Company | Pentax | Pentax |
| Model | Pentax 645Z | Pentax K-S1 |
| Type | Pro DSLR | Advanced DSLR |
| Released | 2014-04-15 | 2014-08-27 |
| Physical type | Large SLR | Mid-size SLR |
| Sensor Information | ||
| Powered by | PRIME III | Prime MII |
| Sensor type | CMOS | CMOS |
| Sensor size | Medium format | APS-C |
| Sensor dimensions | 44 x 33mm | 23.5 x 15.6mm |
| Sensor area | 1,452.0mm² | 366.6mm² |
| Sensor resolution | 51 megapixels | 20 megapixels |
| Anti aliasing filter | ||
| Aspect ratio | 4:3 | 3:2 |
| Full resolution | 8256 x 6192 | 5472 x 3648 |
| Max native ISO | 204800 | 51200 |
| Minimum native ISO | 100 | 100 |
| RAW files | ||
| Autofocusing | ||
| Manual focus | ||
| AF touch | ||
| Continuous AF | ||
| AF single | ||
| AF tracking | ||
| Selective AF | ||
| AF center weighted | ||
| AF multi area | ||
| AF live view | ||
| Face detect AF | ||
| Contract detect AF | ||
| Phase detect AF | ||
| Number of focus points | 27 | 11 |
| Lens | ||
| Lens mount | Pentax 645AF2 | Pentax KAF2 |
| Number of lenses | 6 | 151 |
| Focal length multiplier | 0.8 | 1.5 |
| Screen | ||
| Display type | Tilting | Fixed Type |
| Display diagonal | 3.2 inches | 3 inches |
| Resolution of display | 1,037 thousand dots | 921 thousand dots |
| Selfie friendly | ||
| Liveview | ||
| Touch screen | ||
| Viewfinder Information | ||
| Viewfinder | Optical (pentaprism) | Optical (pentaprism) |
| Viewfinder coverage | 98% | 100% |
| Viewfinder magnification | 0.85x | 0.64x |
| Features | ||
| Slowest shutter speed | 30 secs | 30 secs |
| Maximum shutter speed | 1/4000 secs | 1/6000 secs |
| Continuous shooting rate | 3.0fps | 5.4fps |
| Shutter priority | ||
| Aperture priority | ||
| Manually set exposure | ||
| Exposure compensation | Yes | Yes |
| Change WB | ||
| Image stabilization | ||
| Inbuilt flash | ||
| Flash range | no built-in flash | 10.00 m (at ISO 100) |
| Flash settings | Flash On, Flash On+Red-eye Reduction, Slow-speed Sync, Slow-speed Sync+Red-eye, P-TTL, Trailing Curtain Sync, contrast-control-sync, high-speed sync, wireless sync | Auto, auto + redeye, on, on + redeye reduction, slow sync, trailing curtain sync, manual |
| Hot shoe | ||
| Auto exposure bracketing | ||
| White balance bracketing | ||
| Maximum flash synchronize | 1/125 secs | - |
| Exposure | ||
| Multisegment metering | ||
| Average metering | ||
| Spot metering | ||
| Partial metering | ||
| AF area metering | ||
| Center weighted metering | ||
| Video features | ||
| Video resolutions | 1920 x 1080 (60i, 50i, 30p, 25p, 24p), 1280 x 720 (60p, 50p, 30p, 25p,24p) | 1920 x 1080 (30,25,24 fps), 1280 x 720 (60,50 fps) |
| Max video resolution | 1920x1080 | 1920x1080 |
| Video format | MPEG-4, H.264 | H.264 |
| Mic port | ||
| Headphone port | ||
| Connectivity | ||
| Wireless | None | Eye-Fi Connected |
| Bluetooth | ||
| NFC | ||
| HDMI | ||
| USB | USB 3.0 (5 GBit/sec) | USB 2.0 (480 Mbit/sec) |
| GPS | Optional | Optional |
| Physical | ||
| Environmental sealing | ||
| Water proof | ||
| Dust proof | ||
| Shock proof | ||
| Crush proof | ||
| Freeze proof | ||
| Weight | 1550 gr (3.42 pounds) | 558 gr (1.23 pounds) |
| Dimensions | 156 x 117 x 123mm (6.1" x 4.6" x 4.8") | 121 x 93 x 70mm (4.8" x 3.7" x 2.8") |
| DXO scores | ||
| DXO All around score | 101 | 78 |
| DXO Color Depth score | 26.0 | 23.5 |
| DXO Dynamic range score | 14.7 | 13.0 |
| DXO Low light score | 4505 | 1061 |
| Other | ||
| Battery life | 650 images | 410 images |
| Type of battery | Battery Pack | Battery Pack |
| Battery model | D-LI90 | D-LI109 |
| Self timer | Yes (2 or 10 secs) | Yes ( 2 or 12 seconds) |
| Time lapse feature | ||
| Type of storage | Dual SD/SDHC/SDXC slots | SD/SDHC/SDXC |
| Card slots | Two | One |
| Price at launch | $5,024 | $339 |
