40 Million Pixels Shocked Pentax 645D Physical Test Report

Before the release of Pentax 645D, the cheapest medium format DSLR in the world was mamia ZD, but even this one? Cheapest? Mamia ZD also costs more than 80,000 RMB, and there is no lens. So when Pentax 645D was released in Japan at a price of more than 60,000 yuan, countless commercial photographers and super enthusiasts were boiling.

Pentax 645D+D FA 645 55mm F2.8 AL [IF] SDM AW

Now, as long as you spend13 more than the top 135 Quan Huafu, you can enjoy the amazing image quality brought by the 40-megapixel medium format SLR, which was absolutely unimaginable in the past. However, there is still one thing that needs to be confirmed, that is, aside from the manufacturer's propaganda, what is the actual performance of the 645D?

Next, let's take a look at the massive photos of 645D found on the website of dc.watch, and the samples measured with the lens of D FA 645 55mm F2.8 AL [IF] SDM AW. Readers interested in this low-priced Quan Huafu DSLR will never miss it.

Six photos of the fuselage:

The 645D adopts the 645AF2 bayonet, which is compatible with the previous FA645 lens, but the equivalent focal length of 645 needs to be multiplied by 1.3.

44 for 645D? The 33mm 40-megapixel CCD sensor is provided by Kodak, and there is no low-pass filter like the sensor provided by Kodak to Leica. Its single pixel size is as high as 6? M, the sensitivity range can be extended to ISO 100- 1600, with 14bit A/D conversion, and the shooting resolution is as high as 7264? 5440, the single size of TIFF document is 120MB, and the single size of RAW+JPEG format is 50-60MB.

On the back of the 645D machine, the handling performance is strong.

645D has an optical viewfinder with a field of view ratio of 98% and a magnification of 0.62 times. Behind it is a top LCD with 3 inches and 926,5438+0 million pixels, which can reach a viewing angle of 65,438+0.70 degrees in all directions. The reinforced protective lens can withstand a pressure of up to 50kg.

The information screen and control buttons of a large set-top box are extremely rich.

There are tripod screws on the side and bottom of the fuselage to facilitate vertical shooting.

645D adopts all-metal skeleton, and up to 70 parts of the fuselage have been treated with dust and drip prevention, which has cold resistance of-10 degree. In addition, Pentax also provided the latest DR II ultra-wave dust removal system for 645D.

On the left is the memory card bin and various interfaces.

Look at that M.UP. It's probably that the reflector has raised the knob. You don't need to be so professional. * Oh *

645D More details:

There is an independent ISO button behind the shutter, and the power-on button integrates the function of viewing the depth of field.

The 645D adopts a newly designed shutter and reflector, with durability of 50,000 times, shutter speed of 30-1/4,000 seconds and flash synchronization speed of1150 seconds.

The slightly inclined information screen at the top of the machine has a huge amount of information.

Double-layer mode dial, and independent focus mode and metering mode knobs.

As a heavyweight medium format DSLR, Pentax has provided a newly designed SAFOX IX+ autofocus system for 645D, with 1 1 autofocus points, 9 of which are high-precision focus points (the focusing system can enhance the optical signals transmitted to these focus points, so that it has higher focusing accuracy). At the same time, 645D's latest 77-zone automatic metering system can collect the focal length, horizontal/vertical composition, magnification and other information of the subject, thus making metering more accurate (supporting central focusing and spot metering functions, exposure compensation can be achieved? 5EV).

The number of buttons on the back is not inferior to the current top 135 SLR.

One-button RAW, SD 1 memory card, SD2 memory card, surround mode.

Dual SD/SDHC memory card

D-LI90 lithium ion battery similar to K-7.

There are tripod screws on the side and bottom of the fuselage to facilitate vertical shooting.

Video, external power supply, HDMI and USB interface

On the other hand, in order to meet the demand of 40 million pixels for large-capacity storage media, Pentax 645D provides two SD/SDHC slots (unfortunately, SDXC is not supported), and its battery is D-LI90 lithium-ion battery like K-7, which can take about 800 photos according to CIPA standard. Finally, the measurements of Pentax 645D are 156? 1 19? 1 17mm, weighing 1400g, and its body is equipped with various interfaces such as HDMI, USB, flash synchronization and external power supply.

Features of 645D:

Like K-7, it provides a variety of color styles and supports user-defined fine tuning.

The 645D is equipped with Prime II (Pentax Real Image Engine II) image processor from K-7, which not only meets the demand of huge data streams for response speed and provides unusually rich color modes, but also enables the shooting speed of the 645D to reach 1. 1fps (JPEG can be 15 in continuous shooting, and RAW+JPEG can be/5 in continuous shooting).

With electronic level

645D provides HDR shooting function, which can greatly improve the dynamic range.

Support chromatic aberration and distortion correction function.

With focus correction function

On pentax D FA645 55mm F2.8 AL [IF] SDM AW lens:

D FA645 55mm F2.8 AL [IF] SDM AW is Pentax's first digitally optimized FA645 lens. From the model, D stands for digital optimization, al stands for compound aspheric lens, IF stands for internal focusing structure, SDM stands for ultrasonic focusing, and AW stands for all-weather operation.

Pentax D FA645 55mm F2.8 AL [IF] SDM AW

D FA645 55mm F2.8 AL [IF] SDM AW is installed on 645D, and its equivalent focal length is 7 1.5mm, and 135 is 43.5mm Seven groups of 9 lenses are adopted, including AL composite aspherical lenses, which can effectively improve the peripheral imaging quality and reduce the influence of halo and dispersion.

Pentax D FA645 55mm F2.8 AL [IF] SDM AW

In order to cooperate with the 645D high-strength and high-reliability fuselage, D FA645 55mm F2.8 AL [IF] SDM AW has also been treated with meticulous dust and drip prevention. At the same time, the front lens adopts Pentax SP(Super Protect) coating, which can effectively resist pollutants.

Pentax D FA645 55mm F2.8 AL [IF] SDM AW

In other aspects, D FA645 55mm F2.8 AL [IF] SDM AW also supports fast-moving focusing system (AF/MF fast switching system), with up to 9 circular aperture blades, minimum aperture F22, nearest focal length of 50cm, photographic magnification of 0. 17 times and volume of 8 1.3? 68.2mm, weight 4 16g, filter aperture 67 mm.

645D actual samples (all samples are in 15-20MB, so downloading needs patience):

JPEG and RAW:

Joint image expert group

Shutter: 1/320s/ aperture: F 1 1/ exposure compensation: +0.3EV/ sensitivity: ISO200/ white balance: automatic.

Raw (DNG)

Shutter: 1/320s/ aperture: F 1 1/ exposure compensation: +0.3EV/ sensitivity: ISO200/ white balance: automatic.

The shooting parameters of the above two photos are exactly the same, but it can be clearly seen that the sample converted from RAW has higher definition. But strangely, the exposure of these two photos seems to be different. The sample of RAW is obviously brighter, and even some highlights are gone.

HDR dynamic range optimization function:

General setting: shutter: 1/400s/ aperture: F9/ exposure compensation: 0EV/ sensitivity: ISO200/ white balance: automatic.

close

standard

exaggerate

As can be seen from the above proofs, after the HDR function is turned on in the 645D, the details of both highlights and dark parts of the proofs are obviously improved.

Dynamic range (focus correction)

close

Shutter: 1/250 seconds/aperture: F5.6/ exposure compensation: +0.3EV/ sensitivity: ISO200/ white balance: automatic.

automatic

Shutter: 1/500s/ aperture: F5.6/ exposure compensation: +0.3EV/ sensitivity: ISO400/ white balance: automatic.

From the sample analysis, the difference between the above two samples is very small, and considering the changes of shooting parameters before and after, we analyze that this function should be an automatic function, which automatically adjusts shooting parameters according to the shooting environment to ensure shooting clarity as much as possible. (The above picture shows that the shutter speed is reduced by increasing the sensitivity and shutter speed. )

Dynamic range (shadow correction)

close

Shutter: 1/6 seconds/aperture: F8/ exposure compensation: 0EV/ sensitivity: ISO200/ white balance: automatic.

low

Shutter: 1/6 seconds/aperture: F8/ exposure compensation: 0EV/ sensitivity: ISO200/ white balance: automatic.

middle

Shutter: 1/6 seconds/aperture: F8/ exposure compensation: 0EV/ sensitivity: ISO200/ white balance: automatic.

high

Shutter: 1/6 seconds/aperture: F8/ exposure compensation: 0EV/ sensitivity: ISO200/ white balance: automatic.

It can be seen from the same sample that after shadow correction is turned on, the brightness of the dark part in the photo is graded up, and the details of the dark part are more and more abundant, but the highlight part does not change much, so there is no problem of highlight overflow.

speed

General setting: aperture: F6.3/ exposure compensation: -0.7EV/ white balance: automatic.

ISO 100

ISO200

ISO400

ISO800

ISO 1000

ISO 1600

The quality of 645D under ISO400 is very good. Clean and exquisite? In ISO800, there is only a slight noise in the dark, and it is so light that I even think it is called? Noise? It's all a little too much. When the sensitivity is ISO 1000, the improvement of noise is very limited compared with ISO800. Only when the sensitivity is in ISO 1600 will you feel obvious noise and some details will be lost.

It can be 645D that all sensitivities except ISO1600,645d are absolute. And even ISO 1600 still has high practical value.

More measurement samples of Pentax 645D:

Shutter: 1/400s/ aperture: F 1 1/ exposure compensation: +0.3EV/ sensitivity: ISO200/ white balance: automatic.

Shutter:1125s/aperture: F9/ exposure compensation: +0.3EV/ sensitivity: ISO200/ white balance: automatic.

Shutter: 1/500s/ aperture: F8/ exposure compensation: +0.3EV/ sensitivity: ISO200/ white balance: automatic.

Shutter: 1/200s/ aperture: F3.2/ exposure compensation: 0EV/ sensitivity: ISO400/ white balance: automatic.

Shutter: 1/800s/ aperture: F4/ exposure compensation: +0.3EV/ sensitivity: ISO200/ white balance: automatic.

Shutter:1100s/aperture: F3.2/ exposure compensation: +0.3EV/ sensitivity: ISO200/ white balance: automatic.

Shutter:1125s/aperture: F4/ exposure compensation: +0.7EV/ sensitivity: ISO400/ white balance: automatic.

Shutter: 1/500s/ aperture: F3.5/ exposure compensation:+1EV/ sensitivity: ISO200/ white balance: automatic.

Shutter: 1/200s/ aperture: F3.5/ exposure compensation: +0.3EV/ sensitivity: ISO200/ white balance: automatic.

Shutter: 1/400s/ aperture: F3.5/ exposure compensation: +0.7EV/ sensitivity: ISO200/ white balance: automatic.

Shutter: 1/400s/ aperture: F4/ exposure compensation:+1EV/ sensitivity: ISO200/ white balance: automatic.

Shutter:1160s/aperture: F7. 1/ exposure compensation: +0.7EV/ sensitivity: ISO200/ white balance: automatic.

Shutter: 1/2000s/ aperture: F3.5/ exposure compensation: 0EV/ sensitivity: ISO200/ white balance: automatic.

Shutter:1100s/aperture: F4/ exposure compensation: +0.7EV/ sensitivity: ISO200/ white balance: automatic.

Shutter: 1/500s/ aperture: F3.5/ exposure compensation: -0.3EV/ sensitivity: ISO200/ white balance: automatic.

Shutter: 1/200s/ aperture: F3.5/ exposure compensation: 0EV/ sensitivity: ISO400/ white balance: automatic.

Shutter:1125s/aperture: F5/ exposure compensation: +0.7EV/ sensitivity: ISO200/ white balance: automatic.

Shutter: 1/500s/ aperture: F3.5/ exposure compensation: +0.3EV/ sensitivity: ISO200/ white balance: automatic.

Shutter:1125s/aperture: F3.5/ exposure compensation: +0.7EV/ sensitivity: ISO200/ white balance: automatic.

Shutter:1125s/aperture: F4.5/ exposure compensation:+1.3EV/ sensitivity: ISO200/ white balance: automatic.

Shutter: 1/200s/ aperture: F2.8/ exposure compensation:+1.3EV/ sensitivity: ISO200/ white balance: automatic.

Shutter: 1/200s/ aperture: F3.2/ exposure compensation: +0.3EV/ sensitivity: ISO200/ white balance: automatic.

Shutter: 1/500s/ aperture: F2.8/ exposure compensation: 0EV/ sensitivity: ISO200/ white balance: automatic.

Shutter: 6 seconds/aperture: F 1 1/ exposure compensation:+1.3EV/ sensitivity: ISO200/ white balance: automatic.

Shutter:1125s/aperture: F8/ exposure compensation:+1EV/ sensitivity: ISO200/ white balance: automatic.

Summary:

At this price, the 645D is impeccable in body design, man-machine interface and image quality. Typical medium frame fuselage, menu similar to K-7, supplemented by rich, comprehensive and powerful control buttons and knobs, plus all-weather dust-proof and drip-proof fuselage/lens and large sensor with 40 million pixels? It can be said that 645D is a medium format DSLR that can meet the needs of most professional users, all-weather shooting environment and various shooting subjects, and the imaging quality completely exceeds 135 SLR.

Pentax 645D

Especially the menu interface from K-7, electronic level, large-size high-precision liquid crystal, various adjustable color settings, HDR, color difference/distortion correction and other functions. All these greatly enhance the control freedom of the 645D, and the control efficiency and flexibility are in line with those of the 135 SLR (unfortunately, the fuselage is not designed more thoroughly, like mamia ZD).

Speaking of image quality, the performance of 645D is not the best in the same level of independent back medium format SLR. After all, compared with many 14bit A/D analog-to-digital conversion units, there is still a certain gap in color and hierarchical expression. However, there is no doubt about the shocking details brought by 40 million pixels. Even the top 135 digital SLR only reaches the A/D conversion unit of 14bit.

More specifically, what excites us most about the 645D is its amazing clarity in the RAW format (of course, this has a lot to do with its matching D FA645 55mm F2.8 AL [IF] SDM AW lens), and as a medium format DSLR, the performance of the 645D is satisfactory at all speeds, even with the lengthened ISO 6550.