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Pentax 645D vs Sigma fp

The Pentax 645D and the Sigma fp are two digital cameras that were officially introduced, respectively, in March 2010 and July 2019. The 645D is a DSLR, while the fp is a mirrorless interchangeable lens camera. The cameras are based on a medium format (645D) and a full frame (fp) sensor. The Pentax has a resolution of 39.5 megapixels, whereas the Sigma provides 24 MP.

Below is an overview of the main specs of the two cameras as a starting point for the comparison.

Headline Specifications
Pentax 645D
versus
Sigma fp
Pentax 645D   Sigma fp
Digital single lens reflex Mirrorless system camera
Pentax 645 mount lenses Leica L mount lenses
39.5 MP – Medium Format sensor 24 MP – Full Frame sensor
no Video 4K/30p Video
ISO 100-1,600 ISO 100-25,600 (6 - 102,400)
Optical viewfinder Viewfinder optional
3.0" LCD – 921k dots 3.2" LCD – 2100k dots
Fixed screen (not touch-sensitive) Fixed touchscreen
1.1 shutter flaps per second 12 shutter flaps per second
Weathersealed bodyWeathersealed body
800 shots per battery charge280 shots per battery charge
156 x 117 x 119 mm, 1480 g 113 x 70 x 45 mm, 422 g
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Going beyond this snapshot of core features and characteristics, what are the differences between the Pentax 645D and the Sigma fp? Which one should you buy? Read on to find out how these two cameras compare with respect to their body size, their imaging sensors, their shooting features, their input-output connections, and their reception by expert reviewers.

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Body comparison

The side-by-side display below illustrates the physical size and weight of the Pentax 645D and the Sigma fp. The two cameras are presented according to their relative size. Three consecutive perspectives from the front, the top, and the back are available. All size dimensions are rounded to the nearest millimeter.

Size Pentax 645D vs Sigma fp
Compare 645D versus fp top
Comparison 645D or fp rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sigma fp is considerably smaller (57 percent) than the Pentax 645D. Moreover, the fp is substantially lighter (71 percent) than the 645D. In this context, it is worth noting that both cameras are splash and dust-proof and can, hence, be used in inclement weather conditions or harsh environments.

The above size and weight comparisons are to some extent incomplete since they do not consider the interchangeable lenses that both of these cameras require. Hence, you might want to study and compare the specifications of available lenses in order to get the full picture of the size and weight of the two camera systems.

Concerning battery life, the 645D gets 800 shots out of its Pentax D-LI90 battery, while the fp can take 280 images on a single charge of its Sigma BP-51 power pack. The power pack in the fp can be charged via the USB port, which can be very convenient when travelling.

The table below summarizes the key physical specs of the two cameras alongside a broader set of comparators. In case you want to display and compare another camera duo, you can use the CAM-parator app to select your camera combination among a large number of options.

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Body Specifications
  empty Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price
Street
Price
1.
 
Pentax 645D 156 mm 117 mm 119 mm 1480 g 800 Y Mar 2010 US$ 9 995ebay.com
2.
 
Sigma fp 113 mm 70 mm 45 mm 422 g 280 Y Jul 2019 US$ 1 899 amazon.com
3.
 
Canon 1D Mark IV 156 mm 157 mm 80 mm 1230 g 1500 Y Oct 2009 US$ 4 999ebay.com
4.
 
Canon 1D X 158 mm 168 mm 83 mm 1551 g 1120 Y Oct 2011 US$ 6 799ebay.com
5.
 
Canon 1D X Mark II 158 mm 168 mm 83 mm 1530 g 1210 Y Feb 2016 US$ 5 999ebay.com
6.
 
Fujifilm X-Pro2 141 mm 83 mm 46 mm 495 g 350 Y Jan 2016 US$ 1 699ebay.com
7.
 
Fujifilm X-T2 133 mm 92 mm 49 mm 507 g 340 Y Jul 2016 US$ 1 599ebay.com
8.
 
Leica S Typ 006 160 mm 120 mm 80 mm 1260 g .. Y Sep 2012 US$ 21 949ebay.com
9.
 
Nikon D3S 160 mm 157 mm 88 mm 1240 g 4200 Y Oct 2009 US$ 5 199ebay.com
10.
 
Nikon D5 160 mm 159 mm 92 mm 1415 g 3780 Y Jan 2016 US$ 6 499ebay.com
11.
 
Nikon D810 146 mm 123 mm 82 mm 980 g 1200 Y Jun 2014 US$ 3 299ebay.com
12.
 
Nikon D850 146 mm 124 mm 79 mm 1005 g 1840 Y Jul 2017 US$ 3 299 amazon.com
13.
 
Panasonic FT7 117 mm 76 mm 37 mm 319 g 300 Y May 2018 US$ 449ebay.com
14.
 
Panasonic S1 149 mm 110 mm 97 mm 1017 g 400 Y Feb 2019 US$ 2 499 amazon.com
15.
 
Pentax 645Z 156 mm 117 mm 123 mm 1550 g 650 Y Apr 2014 US$ 8 499ebay.com
16.
 
Sony A7 127 mm 94 mm 48 mm 474 g 340 Y Oct 2013 US$ 1 699ebay.com
17.
 
Sony A7R 127 mm 94 mm 48 mm 465 g 340 Y Oct 2013 US$ 2 299ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.

Any camera decision will naturally be influenced heavily by the price. The manufacturer’s suggested retail prices give an idea on the placement of the camera in the maker’s lineup and the broader market. The fp was launched at a markedly lower price (by 81 percent) than the 645D, which puts it into a different market segment. Normally, street prices remain initially close to the MSRP, but after a couple of months, the first discounts appear. Later in the product cycle and, in particular, when the replacement model is about to appear, further discounting and stock clearance sales often push the camera price considerably down. Then, after the new model is out, very good deals can frequently be found on the pre-owned market.

Sensor comparison

The size of the sensor inside a digital camera is one of the key determinants of image quality. All other things equal, a large sensor will have larger individual pixel-units that offer better low-light sensitivity, wider dynamic range, and richer color-depth than smaller pixels in a sensor of the same technological generation. Moreover, a large sensor camera will give the photographer more control over depth-of-field in the image and, thus, the ability to better isolate a subject from the background. On the downside, larger sensors tend to be more expensive and lead to bigger and heavier cameras and lenses.

Of the two cameras under consideration, the Pentax 645D features a medium format sensor and the Sigma fp a full frame sensor. The sensor area in the fp is 41 percent smaller. As a result of these sensor size differences, the cameras have a format factor of, respectively, 0.79 and 1.0. The sensor in the 645D has a native 4:3 aspect ratio, while the one in the fp offers a 3:2 aspect.

Pentax 645D and Sigma fp sensor measures

With 39.5MP, the 645D offers a higher resolution than the fp (24MP), but the 645D nevertheless has marginally larger individual pixels (pixel pitch of 6.06μm versus 5.98μm for the fp) due to its larger sensor. However, the fp is a much more recent model (by 9 years and 4 months) than the 645D, and its sensor will have benefitted from technological advances during this time that further enhance the light gathering capacity of its pixels. Coming back to sensor resolution, it should be mentioned that neither of the two cameras has an anti-alias filter installed, so they are able to capture all the detail the sensor resolves.

The resolution advantage of the Pentax 645D implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the 645D for good quality output (200 dots per inch) amounts to 36.3 x 27.2 inches or 92.3 x 69.1 cm, for very good quality (250 dpi) 29.1 x 21.8 inches or 73.8 x 55.3 cm, and for excellent quality (300 dpi) 24.2 x 18.1 inches or 61.5 x 46.1 cm. The corresponding values for the Sigma fp are 30 x 20 inches or 76.2 x 50.8 cm for good quality, 24 x 16 inches or 61 x 40.6 cm for very good quality, and 20 x 13.3 inches or 50.8 x 33.9 cm for excellent quality prints.

The Pentax 645D has a native sensitivity range from ISO 100 to ISO 1600. The corresponding ISO settings for the Sigma fp are ISO 100 to ISO 25600, with the possibility to increase the ISO range to 6-102400.

In terms of underlying technology, the 645D is build around a CCD sensor, while the fp uses a BSI-CMOS imager. Both cameras use a Bayer filter for capturing RGB colors on a square grid of photosensors. This arrangement is found in most digital cameras.

645D versus fp MP

Since 2007, DXO Mark has published sensor performance measurements that have been derived using a consistent methodology. This service assesses and scores the color depth ("DXO Portrait"), dynamic range ("DXO Landscape"), and low-light sensitivity ("DXO Sports") of camera sensors, and also publishes an overall camera score. The table below summarizes the physical sensor characteristics and sensor quality findings and compares them across a set of similar cameras.

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Sensor Characteristics
  empty Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Pentax 645D Medium Format 39.5 7264 5440none24.612.6126282
2.
 
Sigma fp Full Frame 24.0 6000 40004K/30p25.214.2282994
3.
 
Canon 1D Mark IV APS-H 16.0 4896 32641080/30p22.812.0132074
4.
 
Canon 1D X Full Frame 17.9 5184 34561080/30p23.811.8278682
5.
 
Canon 1D X Mark II Full Frame 20.0 5472 36484K/60p24.113.5320788
6.
 
Fujifilm X-Pro2 APS-C 24.0 6000 40001080/60p23.713.0160880
7.
 
Fujifilm X-T2 APS-C 24.0 6000 40004K/30p23.813.1165381
8.
 
Leica S Typ 006 Medium Format 37.5 7500 5000none23.912.282476
9.
 
Nikon D3S Full Frame 12.1 4256 2832720/24p23.512.0325382
10.
 
Nikon D5 Full Frame 20.7 5588 37124K/30p25.112.3234388
11.
 
Nikon D810 Full Frame 36.2 7360 49121080/60p25.714.8285397
12.
 
Nikon D850 Full Frame 45.4 8256 55044K/30p26.414.82660100
13.
 
Panasonic FT7 1/2.3 20.2 5184 38884K/30p20.612.1102851
14.
 
Panasonic S1 Full Frame 24.0 6000 40004K/60p25.214.5333395
15.
 
Pentax 645Z Medium Format 51.1 8256 61921080/60i26.014.74505101
16.
 
Sony A7 Full Frame 24.0 6000 40001080/60p24.814.2224890
17.
 
Sony A7R Full Frame 36.2 7360 49121080/60p25.614.1274695
Note: DXO values in italics represent estimates based on sensor size and age.

Many modern cameras are not only capable of taking still images, but can also record movies. The fp indeed provides for movie recording, while the 645D does not. The highest resolution format that the fp can use is 4K/30p.

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Feature comparison

Apart from body and sensor, cameras can and do differ across a range of features. For example, the 645D has an optical viewfinder, which can be very useful when shooting in bright sunlight. In contrast, the fp relies on live view and the rear LCD for framing. That said, the fp can be equipped with an optional viewfinder – the EVF-11. The adjacent table lists some of the other core features of the Pentax 645D and Sigma fp along with similar information for a selection of comparators.

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Core Features
  empty Camera
Model
Viewfinder
(Type or
000 dots)
Control
Panel
(yes/no)
LCD
Specifications
(inch/000 dots)
LCD
Attach-
ment
Touch
Screen
(yes/no)
Max
Shutter
Speed *
Max
Shutter
Flaps *
Built-in
Flash
(yes/no)
Built-in
Image
Stab
1.
 
Pentax 645Doptical Y3.0 / 921 fixed n 1/4000s 1.1/s n n
2.
 
Sigma fpoptional n3.2 / 2100 fixed Y 1/8000s 12.0/s n n
3.
 
Canon 1D Mark IVoptical Y3.0 / 920 fixed n 1/8000s 10.0/s n n
4.
 
Canon 1D Xoptical Y3.2 / 1040 fixed n 1/8000s 14.0/s n n
5.
 
Canon 1D X Mark IIoptical Y3.2 / 1620 fixed Y 1/8000s 16.0/s n n
6.
 
Fujifilm X-Pro22360 n3.0 / 1620 fixed n 1/8000s 8.0/s n n
7.
 
Fujifilm X-T22360 n3.0 / 1040 full-flex n 1/8000s 8.0/s n n
8.
 
Leica S Typ 006optical Y3.0 / 922 fixed n 1/4000s 1.5/s n n
9.
 
Nikon D3Soptical Y3.0 / 921 fixed n 1/8000s 11.0/s n n
10.
 
Nikon D5optical Y3.2 / 2359 fixed Y 1/8000s 14.0/s n n
11.
 
Nikon D810optical Y3.2 / 1229 fixed n 1/8000s 5.0/s Y n
12.
 
Nikon D850optical Y3.2 / 2359 tilting Y 1/8000s 9.0/s n n
13.
 
Panasonic FT71170 n3.0 / 1040 fixed n 1/1300s 10.0/s Y Y
14.
 
Panasonic S15760 Y3.2 / 2100 full-flex Y 1/8000s 9.0/s n Y
15.
 
Pentax 645Zoptical Y3.2 / 1037 tilting n 1/4000s 3.0/s n n
16.
 
Sony A72400 n3.0 / 1230 tilting n 1/8000s 5.0/s n n
17.
 
Sony A7R2400 n3.0 / 1230 tilting n 1/8000s 4.0/s n n
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.

One feature that is present on the 645D, but is missing on the fp is a top-level LCD. While being, of course, smaller than the rear screen, the control panel conveys some of the essential shooting information and can be convenient for quick and easy settings verification.

The reported shutter speed information refers to the use of the mechanical shutter. Yet, some cameras only have an electronic shutter, while others have an electronic shutter in addition to a mechanical one. In fact, the fp is one of those camera that have an additional electronic shutter, which makes completely silent shooting possible. However, this mode is less suitable for photographing moving objects (risk of rolling shutter) or shooting under artificial light sources (risk of flickering).

The Pentax 645D and the Sigma fp both have an intervalometer built-in. This enables the photographer to capture time lapse sequences, such as flower blooming, a sunset or moon rise, without purchasing an external camera trigger and related software.

Concerning the storage of imaging data, both the 645D and the fp write their files to SDXC cards. The 645D features dual card slots, which can be very useful in case a memory card fails. In contrast, the fp only has one slot. The fp supports UHS-II cards (Ultra High Speed data transfer of up to 312 MB/s), while the 645D cannot take advantage of Ultra High Speed SD cards.

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Connectivity comparison

For some imaging applications, the extent to which a camera can communicate with its environment can be an important aspect in the camera decision process. The table below provides an overview of the connectivity of the Pentax 645D and Sigma fp and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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Input-Output Connections
  empty Camera
Model
Hotshoe
Port
Internal
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Pentax 645DYstereo / ----2.0---
2.
 
Sigma fpYstereo / monoY-micro3.1---
3.
 
Canon 1D Mark IVYstereo / -Y-mini2.0---
4.
 
Canon 1D XYmono / -Y-mini2.0---
5.
 
Canon 1D X Mark IIYmono / monoYYmini3.0---
6.
 
Fujifilm X-Pro2Ystereo / monoY-micro2.0Y--
7.
 
Fujifilm X-T2Ystereo / monoY-micro3.0Y--
8.
 
Leica S Typ 006Y- / ---mini2.0---
9.
 
Nikon D3SYstereo / ---mini2.0---
10.
 
Nikon D5Ystereo / monoYYmini3.0---
11.
 
Nikon D810Ystereo / monoYYmini3.0Y--
12.
 
Nikon D850Ystereo / monoYYmini3.0YYY
13.
 
Panasonic FT7-stereo / mono--micro2.0Y--
14.
 
Panasonic S1Ystereo / monoYYfull3.1Y-Y
15.
 
Pentax 645ZYstereo / monoY-mini3.0---
16.
 
Sony A7Ystereo / monoYYmicro2.0YY-
17.
 
Sony A7RYstereo / monoYYmicro2.0YY-

Studio photographers will appreciate that the Pentax 645D (unlike the fp) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

The fp is a recent model that features in the current product line-up of Sigma. In contrast, the 645D has been discontinued (but can be found pre-owned on ebay). As a replacement in the same line of cameras, the 645D was succeeded by the Pentax 645Z. Further information on the features and operation of the 645D and fp can be found, respectively, in the Pentax 645D Manual (free pdf) or the online Sigma fp Manual.

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Review summary

So how do things add up? Which of the two cameras – the Pentax 645D or the Sigma fp – has the upper hand? Is one clearly better than the other? The listing below highlights the relative strengths of the two models.

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Arguments in favor of the Pentax 645D:

  • More detail: Offers more megapixels (39.5 vs 24MP) with a 26% higher linear resolution.
  • Easier framing: Has an optical viewfinder for image composition and settings control.
  • Easier setting verification: Features an LCD display on top to control shooting parameters.
  • Longer lasting: Can take more shots (800 versus 280) on a single battery charge.
  • Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
  • Greater peace of mind: Features a second card slot as a backup in case of memory card failure.
  • More heavily discounted: Has been available for much longer (launched in March 2010).

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Advantages of the Sigma fp:

  • Broader imaging potential: Can capture not only stills but also 4K/30p video.
  • Larger screen: Has a bigger rear LCD (3.2" vs 3.0") for image review and settings control.
  • More detailed LCD: Has a higher resolution rear screen (2100k vs 921k dots).
  • Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/4000s) to freeze action.
  • Faster burst: Shoots at higher frequency (12 vs 1.1 flaps/sec) to capture the decisive moment.
  • Less disturbing: Has an electronic shutter option for completely silent shooting.
  • More compact: Is smaller (113x70mm vs 156x117mm) and will fit more readily into a bag.
  • Less heavy: Has a lower weight (by 1058g or 71 percent) and is thus easier to take along.
  • Easier travel charging: Can be conveniently charged via its USB port.
  • More legacy lens friendly: Can use many non-native lenses via adapters.
  • Faster data transfer: Supports a more advanced USB protocol (3.1 vs 2.0).
  • Faster buffer clearing: Has an SD card interface that supports the UHS-II standard.
  • More affordable: Was introduced into a lower priced category (81 percent cheaper at launch).
  • More modern: Reflects 9 years and 4 months of technical progress since the 645D launch.

If the count of relative strengths (bullet points above) is taken as a measure, the fp is the clear winner of the contest (15 : 7 points). However, the relevance of individual strengths will vary across photographers, so that you might want to apply your own weighing scheme to the summary points when reflecting and deciding on a new camera. A professional wedding photographer will view the differences between cameras in a way that diverges from the perspective of a travel photog, and a person interested in cityscapes has distinct needs from a macro shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

645D 07:15 fp

How about other alternatives? Do the specifications of the Pentax 645D and the Sigma fp place the cameras among the top in their class? Find out in the latest Best DSLR Camera and Best Mirrorless Interchangeable Lens Camera listings whether the two cameras rank among the cream of the crop.

In any case, while the comparison of the spec-sheets of cameras can offer a general idea of their imaging potential, it remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the 645D or the fp. User reviews, such as those found at amazon, can sometimes inform about these issues, but such feedback is often incomplete, inconsistent, and biased.

Expert reviews

This is why expert reviews are important. The following table reports the overall ratings of the cameras as published by some of the major camera review sites (amateurphotographer [AP], cameralabs [CL], digitalcameraworld [DCW], dpreview [DPR], ephotozine [EPZ], photographyblog [PB]). As can be seen, the professional reviewers agree in many cases on the quality of different cameras, but sometimes their assessments diverge, reinforcing the earlier point that a camera decision is often a very personal choice.

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Expert Camera Reviews
  empty  Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price
Street
Price
1.
 
Pentax 645D5/5.......... Mar 2010 US$ 9 995ebay.com
2.
 
Sigma fp4/5..4/5..4/54.5/5 Jul 2019 US$ 1 899 amazon.com
3.
 
Canon 1D Mark IV5/5....89/100.... Oct 2009 US$ 4 999ebay.com
4.
 
Canon 1D X5/5......4.5/54.5/5 Oct 2011 US$ 6 799ebay.com
5.
 
Canon 1D X Mark II....4.5/589/1004.5/54.5/5 Feb 2016 US$ 5 999ebay.com
6.
 
Fujifilm X-Pro2..+..83/1004.5/54.5/5 Jan 2016 US$ 1 699ebay.com
7.
 
Fujifilm X-T25/5+ +..86/1004.5/55/5 Jul 2016 US$ 1 599ebay.com
8.
 
Leica S Typ 006............ Sep 2012 US$ 21 949ebay.com
9.
 
Nikon D3S5/5....89/1004.5/55/5 Oct 2009 US$ 5 199ebay.com
10.
 
Nikon D5....4/589/1004.5/55/5 Jan 2016 US$ 6 499ebay.com
11.
 
Nikon D8105/5..5/586/1005/54.5/5 Jun 2014 US$ 3 299ebay.com
12.
 
Nikon D8504.5/5+ +5/589/1004.5/55/5 Jul 2017 US$ 3 299 amazon.com
13.
 
Panasonic FT7..+....3.5/53.5/5 May 2018 US$ 449ebay.com
14.
 
Panasonic S14.5/5+ +4.5/588/1004.5/54/5 Feb 2019 US$ 2 499 amazon.com
15.
 
Pentax 645Z5/5..3.5/5..4.5/55/5 Apr 2014 US$ 8 499ebay.com
16.
 
Sony A75/5+ +..80/1005/55/5 Oct 2013 US$ 1 699ebay.com
17.
 
Sony A7R5/5+ +..82/1004.5/55/5 Oct 2013 US$ 2 299ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.

Care should be taken when interpreting the review scores above, though. The assessments were made in relation to similar cameras of the same technological generation. Thus, a score needs to be put into the context of the launch date and the launch price of the camera, and comparing ratings of very distinct cameras or ones that are far apart in terms of their release date have little meaning. Also, please note that some of the review sites have changed their methodology and reporting over time.

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Other camera comparisons

Did this review help to inform your camera decision process? In case you would like to check on the differences and similarities of other camera models, just use the search menu below. Alternatively, you can follow any of the listed hyperlinks for comparisons that others found interesting.

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    Specifications: Pentax 645D vs Sigma fp

    Below is a side-by-side comparison of the specs of the two cameras to facilitate a quick review of their differences and common features.

    Camera Specifications
    Camera Model Pentax 645D Sigma fp
    Camera Type Digital single lens reflex Mirrorless system camera
    Camera Lens Pentax 645 mount lenses Leica L mount lenses
    Launch Date March 2010 July 2019
    Launch Price USD 9,995 USD 1,899
    Sensor Specs Pentax 645D Sigma fp
    Sensor Technology CCD BSI-CMOS
    Sensor Format Medium Format Sensor Full Frame Sensor
    Sensor Size 44.0 x 33.0 mm 35.9 x 23.9 mm
    Sensor Area 1452 mm2 858.01 mm2
    Sensor Diagonal 55 mm 43.1 mm
    Crop Factor 0.79x 1.0x
    Sensor Resolution 39.5 Megapixels 24 Megapixels
    Image Resolution 7264 x 5440 pixels 6000 x 4000 pixels
    Pixel Pitch 6.06 μm 5.98 μm
    Pixel Density 2.72 MP/cm2 2.80 MP/cm2
    Moiré control no AA filter no AA filter
    Movie Capability no Video 4K/30p Video
    ISO Setting 100 - 1,600 ISO 100 - 25,600 ISO
    ISO Boost no Enhancement 6 - 102,400 ISO
    DXO Sensor Quality (score) 82 ..
    DXO Color Depth (bits) 24.6 ..
    DXO Dynamic Range (EV) 12.6 ..
    DXO Low Light (ISO) 1262 ..
    Screen Specs Pentax 645D Sigma fp
    Viewfinder Type Optical viewfinder Viewfinder optional
    Viewfinder Field of View 98%
    Viewfinder Magnification 0.78x
    Top-Level Screen Control Panel no Top Display
    LCD Framing Live View
    Rear LCD Size 3.0inch 3.2inch
    LCD Resolution 921k dots 2100k dots
    LCD Attachment Fixed screen Fixed screen
    Touch Input no Touchscreen Touchscreen
    Shooting Specs Pentax 645D Sigma fp
    Focus System Phase-detect AF Contrast-detect AF
    Manual Focusing Aidno Peaking FeatureFocus Peaking
    Max Shutter Speed (mechanical) 1/4000s 1/8000s
    Continuous Shooting 1.1 shutter flaps/s 12 shutter flaps/s
    Electronic Shutterno E-Shutterup to 1/8000s
    Time-Lapse PhotographyIntervalometer built-inIntervalometer built-in
    Fill Flash no On-Board Flash no On-Board Flash
    Storage Medium SDXC cards SDXC cards
    Single or Dual Card Slots Dual card slots Single card slot
    UHS card support no UHS-II
    Connectivity Specs Pentax 645D Sigma fp
    External Flash Hotshoe Hotshoe
    Studio Flash PC Sync socket no PC Sync
    USB Connector USB 2.0 USB 3.1
    HDMI Port no HDMI micro HDMI
    Microphone Port no MIC socket External MIC port
    Wifi Support no Wifi no Wifi
    Body Specs Pentax 645D Sigma fp
    Environmental SealingWeathersealed bodyWeathersealed body
    Battery Type Pentax D-LI90 Sigma BP-51
    Battery Life (CIPA)800 shots per charge280 shots per charge
    In-Camera Charging no USB charging USB charging
    Body Dimensions 156 x 117 x 119 mm
    (6.1 x 4.6 x 4.7 in)
    113 x 70 x 45 mm
    (4.4 x 2.8 x 1.8 in)
    Camera Weight 1480 g (52.2 oz) 422 g (14.9 oz)
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