Are you looking for the best camera to suit your needs? Due to a wide range of options, making a wise and weighted decision can be rather challenging. Which specs to keep in mind? What are the key pros and cons of each model? This comparison should give some helpful hints!
In this review, we are going to make a detailed comparison of two cameras that fall into different categories. While the first model we are looking at, Pentax 645D belongs to a Pro DSLR category, the other model, Pentax 645D is a Pro Mirrorless camera. Both models feature different types of sensors. Thus, Pentax 645D comes with CCD sensor that has a resolution of 40.0 MP resolution, while our second compared model Sony Alpha A7 III features a 24.0 MP BSI-CMOS sensor.
Both cameras we are going to look at in our overview fall into two different categories - DSLR and MirrorLess. Keeping in mind all the distinctive features of each category, it will be hard to make a detailed comparison of these two models. However, we will do our best to make this review as unbiased and detailed as possible.
To get started, let’s take a look at some of the key features of Pentax 645D and Sony Alpha A7 III and, after this, we can go on to our detailed comparison of these models.
Pentax 645D Key Features:
Sony Alpha A7 III Key Features:
|Sensor Resolution||40.0 MP vs 24.0 MP||40% more pixels|
|Sensor Area||1452 mm2 vs 852.04 mm2||41.3% larger pixel area|
|Battery Life||800 shots vs 610 shots||190 more frames with a single charge|
|Viewfinder Magnification||0.85 vs 0.78||0.07 better magnification|
|Wireless Connectivity||Built-In vs No||Better connectivity|
|NFC||Yes vs No||Easy wireless connectivity with compatible devices|
|Bluetooth||Yes vs No||Connect your camera to other devices via Bluetooth|
|Image Stabilization||Yes vs No||All lenses are stabilized|
|Continuous Shooting||10 fps vs Yes fps||9 fps faster|
|Max Shutter Speed||1/8000 vs 1/4000||Faster shutter speed|
|Number Of Focus Points||693 vs 11||682 more focus points|
|AutoFocus Face Detection||Yes vs No||Very handy for portraits|
|Screen Resolution||922k dots vs 921k dots||0.1% higher resolution screen|
|Touch Screen||Yes vs No||Easy control of camera functions|
|Weight||650 g vs 1480 g||830 g lighter|
|Dxo Color Depth||25 vs 24.6||Better color depth|
|Dxo Dynamic Range||14.7 vs 12.6||Better dynamic range|
|Dxo Low Light Iso||3730 vs 1262||Better High ISO performance|
|Screen Size||3″ | 3″||Large display|
|Viewfinder||Optical (pentaprism) | Electronic||Better framing and control|
|Raw Support||Yes | Yes||Better image quality|
|Sensor Resolution||40.0 MP | 24.0 MP||Bigger prints and more details|
|Storage Slots||2 slots | 2 slots||Extra Storage Slots|
|Bracketing||Yes | Yes||Useful for tough lighting conditions and HDR|
|Flash Sync Port||Yes | Yes||Port for Flash Sync|
|Environmental Sealing||Yes | Yes||Shoot at tough conditions|
|Battery Life||800 shots | 610 shots||Big number of frames with a single charge|
|Screen Resolution||921k dots | 922k dots||Small screen resolution|
|Built-In Flash||No | No||No built-in flash|
Before heading straight to the technical characteristics of each model, let’s start with comparing their physical specs. Let’s start with looking at the physical difference of the two products. Below are images that clearly show the sizes of Pentax 645D and Sony Alpha A7 III from the front view.
Now, let’s go on and see how the reviewed models are different or similar by the top view.
After looking at these images, you should get a clear idea of each model’s dimensions and how they are different from each other. However, we are not going to stop there. The next characteristic worth looking at is the weight. Of course, not every photographer is concerned about the weight, for example, it wouldn't be a decisive point for those who shoot in a studio. However, it is still an important factor because if you happen to go on a long photo session or just love having the camera with you wherever you go, you want to be sure that the chosen model isn't too heavy.
Speaking of weight, Sony Alpha A7 III is a lighter option of these two, as it weights 830g less than the Pentax 645D. This difference, in fact, can become a significant disadvantage for the photographers, who prefer to have their cameras with them wherever they go.
Sensor is, without a doubt, the most significant element of every digital camera. Its type, size, and resolution are the factors that define the quality of future shots. Thus, it is barely possible to pick a suitable camera without looking at these specs.
Are Pentax 645D and Sony Alpha A7 III any different in terms of sensor type?
In fact, that's exactly what makes these two models really different. Thus, it is a good point to consider if your are choosing between these two cameras. Pentax 645D features a 40.0 MP Medium format sized CCD sensor and boasts of a Prime II processor . Sony Alpha A7 III, in its turn, comes with a 24.0 MP Full frame sized BSI-CMOS sensor and Bionz X processor , which makes it significantly different from the first model.
Take a look below to find the comparison of Pentax 645D and Sony Alpha A7 III by the size of their sensors.
One more distinctive feature of compared models is the sensor size. Pentax 645D has a sensor area 0.6x bigger compared to Sony Alpha A7 III. What does it mean? This basically means that if you these cameras them with the same aperture and focal length, the first model will give you more control in terms of the blurry background and depth of field.
If you are interested in photography or has made a career in this field, you should know that different types of shooting actually require different camera characteristics. While one model can produce outstanding portraits, at the same time, it can be terrible for shooting landscapes, and so on. Thus, before you purchase a specific camera, it is vital to decide, which type of shooting you do most often and consider an option that suits it the most.
This section of our comparison is devoted to the performance of Pentax 645D and Sony Alpha A7 III in different fields of photography. Here we are going to look at the five main areas and evaluate how well each of the reviewed models performs in them. This will help you choose an option that suits your needs the most depending on your interest in one or several of these fields.
|Photography Type||Pentax 645D||Sony Alpha A7 III|
Disadvantages:No Significant Disadvantages
Disadvantages:No Significant Disadvantages
Hopefully, our detailed overview of these models has helped you consider all the main specs, pros and cons of each cameras. Maybe, after reading this comparison, some of you have already decided which option to opt for depending on your needs and preferences. However, if you are still wondering which option is a better choice, Pentax 645D or Sony Alpha A7 III, below you can see what scores each of them received in five different aspects. To wrap up, we have used our unique Decision Algorithm that assesses different camera models upon 63 different factors including their price, and, if possible, DxO Mark scores. This algorithm allows us to make our verdict more consistent and objective.
What is our final verdict? Based on our comparison and the final scores of Pentax 645D and Sony Alpha A7 III here is what we can say in conclusion:
According all the factors that we considered in the process of comparing these two cameras, Pentax 645D deserves a higher Total Score than the Sony Alpha A7 III. Thus, if you are choosing between these options, we would recommend you to choose the first model over the other one.
For better understanding of each model’s technical characteristics, find the detailed comparison below:
|Pentax 645D||Sony Alpha A7 III|
|Model||645D||Alpha A7 III|
|Announced||Mar 10, 2010||Feb 27, 2018|
|Body Type||Large SLR"||SLR-style mirrorless|
|Sensor Size||Medium format||Full frame|
|Sensor Dimensions||44 x 33 mm||35.8 x 23.8 mm|
|Sensor Area||1452.00 mm2||852.04 mm2|
|Sensor Resolution||40.0 MP||24.0 MP|
|Max Image Resolution||7264 x 5440||6000 x 4000|
|Max Native ISO||1,600||51,200|
|Max Boosted ISO||n/a||204,800|
|Min Native ISO||200||100|
|Lens Mount||Pentax 645AF2||Sony E|
|Number of Lenses||6||83|
|Focal Length Multiplier||0.8x||1x|
|Macro Focus Range|
|AF Multi Area|
|AF Live View|
|AF Face Detection|
|AF Contrast Detection|
|AF Phase Detection|
|Number of Focus Points||11||693|
|Number of Cross Focus Points||n/a||n/a|
|Screen Type||Fixed Type||Tilting|
|Screen Resolution||921k dots||922k dots|
|ViewFinder Resolution||0k dots||2,359k dots|
|Min Shutter Speed||30 s||30 s|
|Max Shutter Speed||1/4000 s||1/8000 s|
|Continuous Shooting||1.0 fps||10.0 fps|
|Manual Exposure Mode|
|Custom White Balance|
|Flash Modes||Auto, Red-eye, Slow Sync, Rear Curtain||no built-in flash|
|DxO Sensor Scores|
|DxO Sensor Score||82||96|
|DxO Color Depth||24.6||25.0|
|DxO Dynamic Range||12.6||14.7|
|DxO Low Light ISO||1262||3730|
|Video Resolutions||n/a||3840 x 2160 (30p, 24p) 1920 x 1080 (120p, 60p, 60i, 24p), 1440 x 1080 (30p), 640 x 480 (30p)|
|Max Video Resolution||3840 x 2160|
|Video Formats||n/a||MPEG-4, AVCHD, XAVC S, H.264|
|USB||USB 2.0||USB 1|
|Weight||1480 g||650 g|
|Physical Dimensions||156 x 117 x 119 mm||127 x 96 x 74 mm|
|Battery Life||800 shots||610 shots|
|Battery Type||Battery Pack||Battery Pack|
|Storage Type||SD/SDHC||SD/SDHC/SDXC, Memory Stick Duo/Pro Duo/Pro-HG Duo|