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Epson R-D1 vs Sony A7 III

The Epson R-D1 and the Sony Alpha A7 III are two enthusiast cameras that were revealed to the public, respectively, in March 2004 and February 2018. The R-D1 is a rangefinder-focusing mirrorless, while the A7 III is a mirrorless interchangeable lens camera. The cameras are based on an APS-C (R-D1) and a full frame (A7 III) sensor. The Epson has a resolution of 6 megapixels, whereas the Sony provides 24 MP.

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

Headline Specifications
Epson R-D1
versus
Sony A7 III
Epson R-D1   Sony A7 III
Rangefinder camera Mirrorless system camera
Leica M mount lenses Sony E mount lenses
6 MP – APS-C sensor 24 MP – Full Frame sensor
no Video 4K/30p Video
ISO 200-1,600 ISO 100-51,200 (50 - 204,800)
Optical viewfinder Electronic viewfinder (2359k dots)
2.0" LCD – 235k dots 3.0" LCD – 922k dots
Fixed screen (not touch-sensitive) Tilting touchscreen
1 shutter flaps per second 10 shutter flaps per second
no shake reductionIn-body stabilization
not weather sealedWeathersealed body
142 x 89 x 40 mm, 620 g 127 x 96 x 74 mm, 650 g
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Going beyond this snapshot of core features and characteristics, what are the differences between the Epson R-D1 and the Sony Alpha A7 III? 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 Epson R-D1 and the Sony A7 III. The two cameras are presented according to their relative size. Three consecutive perspectives from the front, the top, and the back are available. All width, height and depth dimensions are rounded to the nearest millimeter.

Size Epson R-D1 vs Sony A7 III
Compare R-D1 versus A7 III top
Comparison R-D1 or A7 III rear

If the front view area (width x height) of the cameras is taken as an aggregate measure of their size, the Sony A7 III is somewhat smaller (4 percent) than the Epson R-D1. However, the A7 III is markedly heavier (5 percent) than the R-D1. It is noteworthy in this context that the A7 III is splash and dust-proof, while the R-D1 does not feature any corresponding weather-sealing.

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. A larger imaging sensor will tend to go along with bigger and heavier lenses, although exceptions exist. You can compare the optics available for the two cameras in the Leica M Lens Catalog (R-D1) and the Sony FE Lens Catalog (A7 III).

The power pack in the A7 III can be charged via the USB port, which can be very convenient when travelling.

The adjacent table lists the principal physical characteristics of the two cameras alongside a wider set of alternatives. If you want to switch the focus of the display and review another camera pair, you can move across to the CAM-parator tool and choose from the broad selection of possible camera comparisons there.

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Body Specifications
# image Camera
Model
Camera
Width
Camera
Height
Camera
Depth
Camera
Weight
Battery
Life
Weather
Sealing
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Epson R-D1 142 mm 89 mm 40 mm 620 g .. n Mar 2004 2,999ebay.com
2.
 
Sony A7 III 127 mm 96 mm 74 mm 650 g 610 Y Feb 2018 1,999 amazon.com
3.
 
Canon Rebel 142 mm 99 mm 72 mm 649 g 400 n Aug 2003 899ebay.com
4.
 
Leica CL 131 mm 78 mm 45 mm 403 g 220 n Nov 2017 2,795ebay.com
5.
 
Leica M10 139 mm 80 mm 39 mm 660 g 210 Y Jan 2017 6,595ebay.com
6.
 
Leica X-U Typ 113 140 mm 79 mm 88 mm 635 g 450 Y Jan 2016 2,950ebay.com
7.
 
Leica X Vario 133 mm 73 mm 95 mm 680 g 450 n Jun 2013 2,850ebay.com
8.
 
Leica M9 139 mm 80 mm 37 mm 585 g 550 n Sep 2009 7,999ebay.com
9.
 
Nikon Z6 134 mm 101 mm 67 mm 675 g 310 Y Aug 2018 1,999ebay.com
10.
 
Nikon D40 124 mm 94 mm 64 mm 522 g 470 n Nov 2006 499ebay.com
11.
 
Nikon D50 133 mm 102 mm 76 mm 620 g 400 n Apr 2005 749ebay.com
12.
 
Nikon D70s 140 mm 111 mm 78 mm 679 g 500 n Apr 2005 899ebay.com
13.
 
Nikon D70 140 mm 111 mm 78 mm 679 g 400 n Jan 2004 999ebay.com
14.
 
Sony A7R IV 129 mm 96 mm 78 mm 665 g 670 Y Jul 2019 3,499ebay.com
15.
 
Sony A7R III 127 mm 96 mm 74 mm 650 g 650 Y Oct 2017 3,199ebay.com
16.
 
Sony A9 127 mm 96 mm 63 mm 673 g 650 Y Apr 2017 4,499ebay.com
17.
 
Sony A7 II 127 mm 96 mm 60 mm 599 g 350 Y Nov 2014 1,999ebay.com
Note: Measurements and pricing do not include easily detachable parts, such as add-on or interchangeable lenses or optional viewfinders.
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Any camera decision will obviously take relative prices into account. The retail prices at the time of the camera’s release place the model in the market relative to other models in the producer’s line-up and the competition. The A7 III was launched at a markedly lower price (by 33 percent) than the R-D1, which puts it into a different market segment. Usually, retail prices stay at first close to the launch price, but after several months, discounts become available. 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 imaging sensor is at the core of digital cameras and its size is one of the main determining factors 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. Further, a large sensor camera will give the photographer additional creative options when using shallow depth-of-field to isolate a subject from its 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 Epson R-D1 features an APS-C sensor and the Sony A7 III a full frame sensor. The sensor area in the A7 III is 129 percent bigger. As a result of these sensor size differences, the cameras have a format factor of, respectively, 1.5 and 1.0. Both cameras have a native aspect ratio (sensor width to sensor height) of 3:2.

Epson R-D1 and Sony A7 III sensor measures

With 24MP, the A7 III offers a higher resolution than the R-D1 (6MP), but the A7 III has smaller individual pixels (pixel pitch of 5.94μm versus 7.85μm for the R-D1). Yet, the A7 III is a much more recent model (by 13 years and 11 months) than the R-D1, and its sensor will have benefitted from technological advances during this time that enhance the light gathering capacity of its pixel-units.

The resolution advantage of the Sony A7 III implies greater flexibility for cropping images or the possibility to print larger pictures. The maximum print size of the A7 III for good quality output (200 dots per inch) amounts to 30 x 20 inches or 76.2 x 50.8 cm, for very good quality (250 dpi) 24 x 16 inches or 61 x 40.6 cm, and for excellent quality (300 dpi) 20 x 13.3 inches or 50.8 x 33.9 cm. The corresponding values for the Epson R-D1 are 15 x 10 inches or 38.2 x 25.4 cm for good quality, 12 x 8 inches or 30.6 x 20.3 cm for very good quality, and 10 x 6.7 inches or 25.5 x 16.9 cm for excellent quality prints.

The A7 III has on-sensor phase detect pixels, which results in fast and reliable autofocus acquisition even during live view operation.

The Epson R-D1 has a native sensitivity range from ISO 200 to ISO 1600. The corresponding ISO settings for the Sony Alpha A7 III are ISO 100 to ISO 51200, with the possibility to increase the ISO range to 50-204800.

In terms of underlying technology, the R-D1 is build around a CCD sensor, while the A7 III 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.

R-D1 versus A7 III MP

For many cameras, data on sensor performance has been reported by DXO Mark. 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 following table provides an overview of the physical sensor characteristics, as well as the sensor quality measurements for a selection of comparators.

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Sensor Characteristics
# image Camera
Model
Sensor
Class
Resolution
(MP)
Horiz.
Pixels
Vert.
Pixels
Video
Format
DXO
Portrait
DXO
Landscape
DXO
Sports
DXO
Overall
1.
 
Epson R-D1 APS-C 6.0 3008 2000none21.110.456455
2.
 
Sony A7 III Full Frame 24.0 6000 40004K/30p25.014.7373096
3.
 
Canon Rebel APS-C 6.3 3072 2048none21.010.854455
4.
 
Leica CL APS-C 24.1 6014 40144K/30p24.013.3178882
5.
 
Leica M10 Full Frame 23.8 5952 3992none24.413.2213386
6.
 
Leica X-U Typ 113 APS-C 16.1 4928 32641080/30p23.813.0161480
7.
 
Leica X Vario APS-C 16.1 4928 32721080/30p23.412.7132078
8.
 
Leica M9 Full Frame 18.1 5212 3472none22.511.788469
9.
 
Nikon Z6 Full Frame 24.3 6048 40244K/30p25.314.3329995
10.
 
Nikon D40 APS-C 6.0 3008 2000none21.011.056156
11.
 
Nikon D50 APS-C 6.0 3008 2000none20.910.856055
12.
 
Nikon D70s APS-C 6.0 3008 2000none20.410.352950
13.
 
Nikon D70 APS-C 6.0 3008 2000none20.410.352950
14.
 
Sony A7R IV Full Frame 60.2 9504 63364K/30p26.014.8334499
15.
 
Sony A7R III Full Frame 42.2 7952 53044K/30p26.014.73523100
16.
 
Sony A9 Full Frame 24.0 6000 40004K/30p24.913.3351792
17.
 
Sony A7 II Full Frame 24.0 6000 40001080/60p24.913.6244990
Note: DXO values in italics represent estimates based on sensor size and age.
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Many modern cameras cannot only take still pictures, but also record videos. The A7 III indeed provides for movie recording, while the R-D1 does not. The highest resolution format that the A7 III can use is 4K/30p.

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Feature comparison

Apart from body and sensor, cameras can and do differ across a variety of features. For example, the A7 III has an electronic viewfinder (2359k dots), while the R-D1 has an optical one. Both systems have their advantages, with the electronic viewfinder making it possible to project supplementary shooting information into the framing view, whereas the optical viewfinder offers lag-free viewing and a very clear framing image. The adjacent table lists some of the other core features of the Epson R-D1 and Sony A7 III along with similar information for a selection of comparators.

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Core Features
# image 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.
 
Epson R-D1optical n2.0 / 235 fixed n 1/2000s 1.0/s n n
2.
 
Sony A7 III2359 n3.0 / 922 tilting Y 1/8000s 10.0/s n Y
3.
 
Canon Rebeloptical n1.8 / 118 fixed n 1/4000s 2.5/s Y n
4.
 
Leica CL2360 Y3.0 / 1040 fixed Y 1/8000s 10.0/s n n
5.
 
Leica M10optical n3.0 / 1037 fixed n 1/4000s 5.0/s n n
6.
 
Leica X-U Typ 113optional n3.0 / 920 fixed n 1/2000s 5.0/s Y n
7.
 
Leica X Variooptional n3.0 / 920 fixed n 1/2000s 5.0/s Y n
8.
 
Leica M9optical n2.5 / 230 fixed n 1/4000s 2.0/s n n
9.
 
Nikon Z63690 Y3.2 / 2100 tilting Y 1/8000s 12.0/s n Y
10.
 
Nikon D40optical n2.5 / 230 fixed n 1/4000s 2.5/s Y n
11.
 
Nikon D50optical n2.0 / 130 fixed n 1/4000s 2.5/s Y n
12.
 
Nikon D70soptical n2.0 / 130 fixed n 1/8000s 3.0/s Y n
13.
 
Nikon D70optical n1.8 / 130 fixed n 1/8000s 3.0/s Y n
14.
 
Sony A7R IV5760 n3.0 / 1440 tilting Y 1/8000s 10.0/s n Y
15.
 
Sony A7R III3686 n3.0 / 1440 tilting Y 1/8000s 10.0/s n Y
16.
 
Sony A93686 n3.0 / 1440 tilting Y 1/8000s 20.0/s n Y
17.
 
Sony A7 II2400 n3.0 / 1230 tilting n 1/8000s 5.0/s n Y
Note: *) Information refers to the mechanical shutter, unless the camera only has an electronic one.
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One differentiating feature between the two cameras concerns the touch sensitivity of the rear screen. The A7 III has a touchscreen, while the R-D1 has a conventional panel. Touch control can be particularly helpful, for example, for setting the focus point.

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 A7 III 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 Sony A7 III has 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.

The R-D1 writes its imaging data to SDHC cards, while the A7 III uses SDXC or Memory Stick PRO Duo cards. The A7 III features dual card slots, which can be very useful in case a memory card fails. In contrast, the R-D1 only has one slot. The A7 III supports UHS-II cards on its first slot and UHS-I on its second one, while the R-D1 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 Epson R-D1 and Sony Alpha A7 III and, in particular, the interfaces the cameras (and selected comparators) provide for accessory control and data transfer.

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Input-Output Connections
# image Camera
Model
Hotshoe
Port
Internal
Mic / Speaker
Microphone
Port
Headphone
Port
HDMI
Port
USB
Port
WiFi
Support
NFC
Support
Bluetooth
Support
1.
 
Epson R-D1Y- / --------
2.
 
Sony A7 IIIYstereo / monoYYmicro3.1YYY
3.
 
Canon RebelY- / ----1.1---
4.
 
Leica CLYstereo / mono----Y--
5.
 
Leica M10Y- / -----Y--
6.
 
Leica X-U Typ 113Ystereo / mono---2.0---
7.
 
Leica X VarioYstereo / mono--mini2.0---
8.
 
Leica M9Y- / ----2.0---
9.
 
Nikon Z6Ystereo / monoYYmicro3.1Y-Y
10.
 
Nikon D40Y- / ----2.0---
11.
 
Nikon D50Y- / ----2.0---
12.
 
Nikon D70sY- / ----2.0---
13.
 
Nikon D70Y- / ----1.0---
14.
 
Sony A7R IVYstereo / monoYYmicro3.1YYY
15.
 
Sony A7R IIIYstereo / monoYYmicro3.1YYY
16.
 
Sony A9Ystereo / monoYYmicro2.0YYY
17.
 
Sony A7 IIYstereo / monoYYmicro2.0YY-
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It is notable that the A7 III offers wifi support, which can be a very convenient means to transfer image data to an off-camera location. In contrast, the R-D1 does not provide wifi capability.

Studio photographers will appreciate that the Epson R-D1 (unlike the A7 III) features a PC Sync socket, so that professional strobe lights can be controlled by the camera.

The A7 III is a recent model that features in the current product line-up of Sony. In contrast, the R-D1 has been discontinued (but can be found pre-owned on ebay). There has not been a direct replacement model for the R-D1 from Epson. Further information on the features and operation of the R-D1 and A7 III can be found, respectively, in the Epson R-D1 Manual (free pdf) or the online Sony A7 III Manual.

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Review summary

So what conclusions can be drawn? Is there a clear favorite between the Epson R-D1 and the Sony A7 III? Which camera is better? The listing below highlights the relative strengths of the two models.

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Advantages of the Epson R-D1:

  • Brighter framing: Features an optical viewfinder for clear, lag-free composition.
  • Better studio light control: Has a PC Sync socket to connect to professional strobe lights.
  • More heavily discounted: Has been available for much longer (launched in March 2004).

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Arguments in favor of the Sony Alpha A7 III:

  • More detail: Has more megapixels (24 vs 6MP), which boosts linear resolution by 100%.
  • Better image quality: Is equipped with a larger and more technologically advanced sensor.
  • Richer colors: The sensor size advantage translates into images with better, more accurate colors.
  • More dynamic range: Larger sensor captures a wider spectrum of light and dark details.
  • Better low-light sensitivity: Larger sensor produces good images even in poorly lit environments.
  • Broader imaging potential: Can capture not only stills but also 4K/30p video.
  • Better live-view autofocus: Features on-sensor phase-detection for more confident autofocus.
  • More framing info: Has an electronic viewfinder that displays shooting data.
  • Larger screen: Has a bigger rear LCD (3.0" vs 2.0") for image review and settings control.
  • More detailed LCD: Has a higher resolution rear screen (922k vs 235k dots).
  • More flexible LCD: Has a tilting screen for odd-angle shots in landscape orientation.
  • Fewer buttons to press: Has a touchscreen to facilitate handling and shooting adjustments.
  • Faster shutter: Has higher mechanical shutter speed (1/8000s vs 1/2000s) to freeze action.
  • Faster burst: Shoots at higher frequency (10 vs 1 flaps/sec) to capture the decisive moment.
  • Less disturbing: Has an electronic shutter option for completely silent shooting.
  • Easier time-lapse photography: Has an intervalometer built-in for low frequency shooting.
  • Easier travel charging: Can be conveniently charged via its USB port.
  • Better sealing: Is splash and dust sealed for shooting in inclement weather conditions.
  • Sharper images: Has stabilization technology built-in to reduce the impact of hand-shake.
  • Easier file upload: Has wifi built in for automatic backup or image transfer to the web.
  • Easier device pairing: Supports NFC for fast wireless image transfer over short distances.
  • Easier wireless transfer: Supports Bluetooth for image sharing without cables.
  • Greater peace of mind: Features a second card slot as a backup in case of memory card failure.
  • Faster buffer clearing: Supports Ultra High Speed (UHS-II and UHS-I) SDXC cards.
  • More affordable: Was introduced into a lower priced category (33 percent cheaper at launch).
  • More modern: Reflects 13 years and 11 months of technical progress since the R-D1 launch.

If the number of relative strengths (bullet points above) is taken as a guide, the A7 III is the clear winner of the contest (26 : 3 points). However, the relative importance of the various individual camera aspects will vary according to personal preferences and needs, so that you might like to apply corresponding weights to the particular features before making a decision on a new camera. A professional wildlife photographer will view the differences between cameras in a way that diverges from the perspective of a family photog, and a person interested in architecture has distinct needs from a sports shooter. Hence, the decision which camera is best and worth buying is often a very personal one.

R-D1 03:26 A7 III

In any case, while the specs-based evaluation of cameras can be instructive in revealing their potential as photographic tools, it remains partial and cannot reveal, for example, the shooting experience and imaging performance when actually working with the R-D1 or the A7 III. User reviews that are available, for instance, at amazon can sometimes shed light on these issues, but such feedback is all too often partial, inconsistent, and inaccurate.

Expert reviews

This is where reviews by experts come in. The adjacent summary-table relays the overall verdicts of several of the most popular 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
# image  Camera 
 Model 
 AP 
 score 
 CL 
 score 
 DCW 
 score 
 DPR 
 score 
 EPZ 
 score 
 PB 
 score 
Camera
Launch
Launch
Price (USD)
Street
Price
1.
 
Epson R-D1............ Mar 2004 2,999ebay.com
2.
 
Sony A7 III..+ +4.5/589/1005/55/5 Feb 2018 1,999 amazon.com
3.
 
Canon Rebel......+ +.... Aug 2003 899ebay.com
4.
 
Leica CL....4.2/5....4/5 Nov 2017 2,795ebay.com
5.
 
Leica M104.5/5......4/54.5/5 Jan 2017 6,595ebay.com
6.
 
Leica X-U Typ 1133.5/5........3.5/5 Jan 2016 2,950ebay.com
7.
 
Leica X Vario3/5......4/54/5 Jun 2013 2,850ebay.com
8.
 
Leica M9........4.5/5.. Sep 2009 7,999ebay.com
9.
 
Nikon Z65/5..5/589/1004.5/55/5 Aug 2018 1,999ebay.com
10.
 
Nikon D40..81/100..+ +o4.5/5 Nov 2006 499ebay.com
11.
 
Nikon D50..78/100..+ +4/54.5/5 Apr 2005 749ebay.com
12.
 
Nikon D70s..........5/5 Apr 2005 899ebay.com
13.
 
Nikon D70......+ +.... Jan 2004 999ebay.com
14.
 
Sony A7R IV5/5+4.5/591/1004.5/55/5 Jul 2019 3,499ebay.com
15.
 
Sony A7R III..+ +4/590/1004.5/55/5 Oct 2017 3,199ebay.com
16.
 
Sony A95/5+ +4.8/589/1005/55/5 Apr 2017 4,499ebay.com
17.
 
Sony A7 II5/5+4/582/1004.5/55/5 Nov 2014 1,999ebay.com
Note: (+ +) highly recommended; (+) recommended; (o) reviewed; (..) not available.
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Care should be taken when interpreting the review scores above, though. The ratings were established in reference to similarly priced cameras that were available in the market at the time of the review. 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, kindly note that some of the listed sites have over time developped their review approaches and their reporting style.

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Other camera comparisons

Did this review help to inform your camera decision process? In case you are interested in seeing how other cameras pair up, just make your choice using the following search menu. As an alternative, you can also directly jump to any one of the listed comparisons that were previously generated by the CAM-parator tool.

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    Specifications: Epson R-D1 vs Sony A7 III

    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 Epson R-D1 Sony A7 III
    Camera Type Rangefinder camera Mirrorless system camera
    Camera Lens Leica M mount lenses Sony E mount lenses
    Launch Date March 2004 February 2018
    Launch Price USD 2,999 USD 1,999
    Sensor Specs Epson R-D1 Sony A7 III
    Sensor Technology CCD BSI-CMOS
    Sensor Format APS-C Sensor Full Frame Sensor
    Sensor Size 23.7 x 15.6 mm 35.6 x 23.8 mm
    Sensor Area 369.72 mm2 847.28 mm2
    Sensor Diagonal 28.4 mm 42.8 mm
    Crop Factor 1.5x 1.0x
    Sensor Resolution 6 Megapixels 24 Megapixels
    Image Resolution 3008 x 2000 pixels 6000 x 4000 pixels
    Pixel Pitch 7.85 μm 5.94 μm
    Pixel Density 1.63 MP/cm2 2.83 MP/cm2
    Moiré control Anti-Alias filter Anti-Alias filter
    Movie Capability no Video 4K/30p Video
    ISO Setting 200 - 1,600 ISO 100 - 51,200 ISO
    ISO Boost no Enhancement 50 - 204,800 ISO
    DXO Sensor Quality (score) .. 96
    DXO Color Depth (bits) .. 25.0
    DXO Dynamic Range (EV) .. 14.7
    DXO Low Light (ISO) .. 3730
    Screen Specs Epson R-D1 Sony A7 III
    Viewfinder Type Optical viewfinder Electronic viewfinder
    Viewfinder Field of View 100% 100%
    Viewfinder Magnification 0.78x
    Viewfinder Resolution 2359k dots
    LCD Framing Live View
    Rear LCD Size 2.0inch 3.0inch
    LCD Resolution 235k dots 922k dots
    LCD Attachment Fixed screen Tilting screen
    Touch Input no Touchscreen Touchscreen
    Shooting Specs Epson R-D1 Sony A7 III
    Focus System Manual Focus On-Sensor Phase-detect
    Manual Focusing Aidno Peaking FeatureFocus Peaking
    Max Shutter Speed (mechanical) 1/2000s 1/8000s
    Continuous Shooting 1 shutter flaps/s 10 shutter flaps/s
    Electronic Shutterno E-ShutterYES
    Time-Lapse Photographyno IntervalometerIntervalometer built-in
    Image Stabilizationno shake reductionIn-body stabilization
    Fill Flash no On-Board Flash no On-Board Flash
    Storage Medium SDHC cards MS or SDXC cards
    Single or Dual Card Slots Single card slot Dual card slots
    UHS card support no Single UHS-II
    Connectivity Specs Epson R-D1 Sony A7 III
    External Flash Hotshoe Hotshoe
    Studio Flash PC Sync socket no PC Sync
    USB Connector no USB USB 3.1
    HDMI Port no HDMI micro HDMI
    Microphone Port no MIC socket External MIC port
    Headphone Socket no Headphone port Headphone port
    Wifi Support no Wifi Wifi built-in
    Near-Field Communication no NFC NFC built-in
    Bluetooth Support no Bluetooth Bluetooth built-in
    Body Specs Epson R-D1 Sony A7 III
    Environmental Sealingnot weather sealedWeathersealed body
    Battery Type Epson EU-85 Sony NP-FZ100
    In-Camera Charging no USB charging USB charging
    Body Dimensions 142 x 89 x 40 mm
    (5.6 x 3.5 x 1.6 in)
    127 x 96 x 74 mm
    (5.0 x 3.8 x 2.9 in)
    Camera Weight 620 g (21.9 oz) 650 g (22.9 oz)
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