Canon EOS Ra Review

Canon EOS Ra Review

Canon EOS Ra especially for astrophotography: Modified EOS R

The EOS Ra is a modified EOS model designed to meet the specific needs of astrophotographers. It is based on the EOS R, which has been available since September 2018. The EOS Ra captures four times the amount of hydrogen alpha light compared to the EOS R. The EOS Ra allows the capture of the clearly red color components of diffuse nebulae in space, which are interstellar dust clouds consisting mainly of hydrogen and helium. This is not possible with a conventional camera, since the UV/IR blocking filters installed there absorb exactly those light components from the IR spectrum that otherwise give these nebulae their typical red coloration.

Thanks to the special infrared blocking filter, the Canon EOS Ra absorbs four times as much hydrogen alpha light as the normal EOS R, allowing red fog to be recorded in space. [Photo: Canon]

Thanks to its compactness and small flange focal length, the Canon EOS Ra (similar to the image) can be easily mounted on telescopes. The rotating and swivelling touch screen facilitates operation. [Photo: Canon]

Thanks to the technical basis “EOS R”, the EOS Ra has a 30 megapixel resolution 35 mm sensor and the same autofocus sensitive to -6 EV. A 30x magnifying glass is also available for focus control. If desired, the detail can be converted to the APS-C format, for example, but the resolution is then only 11.3 megapixels. According to Canon, other formats are also possible in order to adapt the camera to the image section of the telescope to which it is connected. Thanks to the small flange focal length of the EOS-R bayonet, adaptations are no problem at all. The compact and lightweight design of the EOS Ra makes it easy to mount it on a telescope. Thanks to the rotating and swivelling touch screen, the operation of the camera on the telescope as well as the image control is made easier.

Thanks to the 4K video function, the EOS Ra is also the first astro camera with such high-resolution video. It also allows the creation of 4K time-lapse videos. Thanks to the support of the EOS utility software and the Canon Camera Connect app, the EOS Ra can be controlled remotely, wired or wirelessly (WLAN and Bluetooth). The Canon EOS Ra should cost almost 2,770 Euros, 280 Euros more than the UVP of the normal EOS R.

The Canon EOS Ra is a customized version of the mirrorless full-frame camera EOS R. It also resolves with 30 megapixels. Compared to the EOS R, however, the EOS Ra has a new infrared filter arrangement in front of the sensor. This passes four times as much hydrogen alpha light to the sensor. In this way, the full-frame camera can capture the reddish color of diffuse nebula more clearly and more differentiated.

The EOS Ra features a touch screen and a 30x magnification that allows photographers to closely view the details in the image. The display is also rotatable and swiveling and sets the focus on your fingertips on the touchscreen. Due to the lack of mirrors, the housing of the EOS-R family is compact and relatively light. The EOS Ra can be easily mounted on a telescope. 

Astro-filmmakers should also get their money’s worth with the EOS Ra. The camera takes videos and time-lapse of the nightly starry sky in 4K. With an ISO value of up to 40,000, the EOS Ra should still take decent pictures in low light. In darkness, she should also be able to quickly focus 6 FW AF the desired object. 

Canon EOS Ra Datasheet


Sensor CMOS sensor 35mm 36.0 x 24.0 mm (crop factor 1.0
)31.7 megapixels (physical) and 30.3 megapixels (effective)
Pixel pitch 5.3 µm
Photo resolution
6.720 x 4.480 pixels (3:2)
5.952 x 4.480 pixels (4:3)
4.480 x 4.480 pixels (1:1)
4.464 x 2.976 pixels (3:2)
4.464 x 2.512 pixels (16:9)
3.968 x 2.976 pixels (4:3)
3.360 x 2.240 pixels (3:2)
3.360 x 1.888 pixels (16:9)
2.976 x 2.976 pixels (1:1)
2.976 x 2.240 pixels (4:3)
2.400 x 1.600 pixels (3:2)
2.400 x 1.344 pixels (16:9)
2.240 x 2.240 pixels (1:1)
2.112 x 1.600 pixels (4:3)
1.600 x 1.600 pixels (1:1)
Picture formats JPG, RAW
Colour depth 24 bits (8 bits per color channel), 42 bits (14 bits per color channel)
Metadata Exif (version 2.3), DCF standard (version 2.0), IPTC
Video resolution
3.840 x 2.160 (16:9) 30 p
3.840 x 2.160 (16:9) 24 p
1.920 x 1.080 (16:9) 60 p
1.920 x 1.080 (16:9) 30 p
1.920 x 1.080 (16:9) 24 p
1.280 x 720 (16:9) 120 p
1.280 x 720 (16:9) 60 p
1.270 x 720 (16:9) 30 p
HDR video yes
Video format
MP4 (Codec H.264)


Lens mount
Canon RF


Autofocus mode Phase comparison autofocus with 5,655 sensors, autofocus working range from -6 EV to 18 EV, contrast autofocus
Autofocus Functions Single Auto Focus, Continuous Auto Focus, Area Auto Focus, Tracking Auto Focus, Manual, AFL Function, AF Assist Light (LED), Focus Peaking, Focus Magnifier (30x)
Focus control Depth of field control, dimming button

Viewfinder and Monitor

Monitor 3.2″ (8.0 cm) TFT LCD monitor with 2,100,000 pixels, brightness adjustable, tiltable 270°, rotatable 180°, with touch screen
Info display additional info display (top) with illumination
Video viewfinder Video viewfinder (100 % field coverage) with 3,690,000 pixels, 0.76x magnification factor, diopter compensation (-4.0 to 2.0 dpt)


Exposure metering Center-weighted integral measurement, matrix/multi-field measurement over 384 fields, spot measurement (measurement over 3% of the image field), AF-AE coupling
Exposure times 1/8,000 to 30 s (Auto
)1/8,000 to 30 s (Manual)
Bulb Function
Exposure control Fully Automatic, Program Automatic (with Program Shift), Aperture Priority, Aperture Priority, Manual
Bracketing function Exposure bracketing function with maximum 7 shots, step size from 1/3 to 3 EV, HDR function
Exposure compensation -3.0 to +3.0 EV with step size from 1/3 to 1/2 EV
Sensitivity to light ISO 100 to ISO 40.000 (automatic
)ISO 50 to ISO 102.400 (manual)
Remote access Remote release, cable release, remote control via smartphone/tablet
, remote control from computer: certain functions
Picture effects Landscape, Monochrome, Neutral, Portrait, 4 more image effects
White balance Auto, Clouds, Sun, Fine Tuning, Shadows, Flash, Fluorescent Lamp, Incandescent Light, Kelvin Input, Manual
Color space Adobe RGB, sRGB
Continuous shooting Continuous shooting function max. 8.0 fps at highest resolution and max. 100 stored photos, 47 consecutive images at RAW, 5 frames per second with AF tracking
Self-timer Self-timer every 10 s, special features: or 2 seconds
Shooting functions AEL function, AFL function, live histogram


Flash no built-in flash availableFlash shoe
: Canon, standard center contact
Flash range Flash sync time 1/200 s
Flash functions Auto, Fill Flash, Flash On, Flash Off, High Speed Sync, Slow Sync, Flash On Second Shutter Curtain, Flash Exposure Compensation from -3.0 EV to +2.0 EV


Image stabilizer no optical image stabilizer
GPS function GPS external (permanent smartphone connection|wired or plug-on receiver)
Microphone Stereo
Power supply no power supply connectionUSB charging function
Power supply 1 x Canon LP-E6N (lithium ion (Li-Ion), 7.2 V, 1,865 mAh
)370 CIPA-standard images
Playback Functions Red eye retouching, crop images, rotate images, protect images, highlight / shadow warning, playback histogram, playback magnifier with 10.0x magnification, image index, slide show function with fade effects, zoom out
Face recognition Face recognition
Picture parameters Sharpness, Contrast, Saturation, Noise Reduction
Special functions Electronic Spirit Level, Grid Display, Orientation Sensor, Live View, User Profiles with 1 User Profile and 22 Options
Ports Data interfaces: Bluetooth, WLANUSB type
:USB 3.1 SuperSpeedPlusWLAN
: available (type: B, G, N)
AV connectors AV output: HDMI output Mini (Type C
)Audio input: yes (3.5 mm stereo microphone jack)
Audio output: yes (3.5 mm stereo jack (3-pin))
Supported direct printing methods DPOF, PictBridge
Tripod socket 1/4″ in optical axis
Case Splash guard
Features and Miscellaneous DIGIC 8 Image ProcessorIR Block Filter System
for Improved Hydrogen Alpha Light TransmissionSensor Cleaning SystemTouchBar143
AF AreaThree
Picture StylesOLED MemoryPlots for Picture StylesOLED
Video FinderGrid
Display (3 x 3, 6 x 4, 3 x 3 + Diagonal)
Video ISO (100-102,400)
Log Recording: 4K/Full HD/HD YCbCr 4:2:0 BT.709

8-bit (Internal Memory), 4K/Full HD/HD YCbCr 4:2:2 BT.709 8-bit (HDMI Output), 4K YCbCr 4:2:2 BT.709/BT.2020 10-bit (HDMI Output)
Exposure Compensation Video (-3 to +3 EV in 1/3 and 1/2 steps)
Dual Pixel RAW Support

Technical information This camera is a version of the EOS R optimized for astrophotography.

Size and weight

Dimensions W x H x D 139 x 98 x 84 mm
Weight 580 g (ready for operation)


included accessories Canon IFC-100U USB cableCanon
LC-E6E Charger for special rechargeable batteriesCanon
LP-E6N Special rechargeable battery power cable
optional accessory Canon AC-E6N AC AdapterCanon
BG-E22 Rechargeable Battery HandleCanon
CBC-E6 Charger for Special BatteriesCanon
DR-E6 Battery Compartment Adapter CableCanon
GP-E2 (GPS Receiver)
Canon MR-14EX Macro FlashCanon
MR-14EX II Macro FlashCanon
MT-24EX Macro FlashCanon

T Macro flashCanon
Speedlite 220EX Small additional flashCanon
Speedlite 270EX Slip-on flash with swivel reflectorCanon
Speedlite 270EX II Slip-on flash with swivel reflectorCanon
Speedlite 320EX Slip-on flash with swivel reflector


Speedlite 380EX Slip-on flash with swivel reflectorCanon
Speedlite 420EX Slip-on flash with swivel reflector

Speedlite 430EX Slip-on flash with swivel reflectorCanon
Speedlite 430EX II Slip-on flash with swivel reflectorCanon
Speedlite 430EX III-


T Slip-on flash with swivel reflectorCanon
Speedlite 470EX-AI Slip-on flash with swivel reflector

Speedlite 550EX Slip-on flash with swivel reflectorCanon Speed


580EX S

lip-on flash with swivel reflectorCanon Speedlite 580EX

II Slip-on flash with swivel reflectorCanon

Speedlite 600EX

Slip-on flash with sw

ivel reflectorCanon Speedlite

600EX II-


T Slip-on flash with swivel reflectorCanon
Speedlite 600EX-RT Slip-on flash with swivel reflectorCanon
Speedlite 90EX Small additional flashCanon
WFT-E7B (WiFi adapter)
USB power adapter EC809

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