Developed specifically for those looking to photograph the night sky, the Canon EOS Ra is a modified version of the original EOS R that incorporates an optical IR cut filter in front of the sensor for photographing distant nebulae and other astronomical phenomena with utmost clarity. By updating the EOS R's design with a dedicated filter, the EOS Ra provides approximately 4x improved transmission and sensitivity to H-alpha (656.28nm) wavelengths for depicting nebulae and other subjects without unwanted infrared contamination for greater color neutrality. Additionally, a 30x live view magnification setting has also been added for improved focusing precision on distant subjects when working with either the EVF or rear LCD. Beyond these couple distinctions, the EOS Ra and EOS R feature the same set of core features to produce high resolution, well-detailed imagery.
The EOS Ra features a high-resolution 30.3MP full-frame CMOS sensor along with a DIGIC 8 image processor. The combination of these technologies offers a wide sensitivity range up to a native ISO 40000, fast continuous shooting to 8 fps, and UHD 4K30 video recording. In addition to imaging, the sensor also facilitates an advanced Dual Pixel CMOS AF system, which uses 5655 selectable points for quickly and accurately acquiring focus. This focusing system is also sensitive down to EV -6 for working in impressively dark conditions. The AF system is also perfectly matched to the UHD 4K video recording capabilities, which are also rounded out by Movie Digital IS to minimize camera shake, built-in Canon Log gamma for a greater dynamic range, and 4K 10-bit 4:2:2 output over HDMI for even greater color control.
Beyond the performance attributes, this camera has been designed from the ground up and features a high-resolution 3.69m-dot OLED electronic viewfinder for clear and bright eye-level viewing. Conversely, a rear 3.15" 2.1m-dot LCD touchscreen is also featured and has a swivel design to suit working from high and low angles. Also catering to the tactile cravings is a Multi-Function bar, which is customizable for intuitively adjusting shooting settings. And as a camera built to withstand the toughest environments, the magnesium alloy body is dust and moisture-sealed.
|Lens Mount||Canon RF|
|Camera Format||Full-Frame (1x Crop Factor)|
|Pixels||Actual: 31.7 Megapixel
Effective: 30.3 Megapixel
|Maximum Resolution||6720 x 4480|
|Aspect Ratio||1:1, 3:2, 4:3, 16:9|
|Sensor Size||36 x 24 mm|
|Image File Format||JPEG, Raw|
|Image Stabilization||Digital, 5-Axis (Video Only)|
|ISO Sensitivity||Auto, 100 to 40000 (Extended: 50 to 102400)|
|Shutter Speed||Electronic Front Curtain Shutter
1/8000 to 30 Seconds
|Metering Method||Center-Weighted Average, Evaluative, Partial|
|Exposure Modes||Aperture Priority, Manual, Shutter Priority|
|Exposure Compensation||-3 to +3 EV (1/3, 1/2 EV Steps)|
|Metering Range||-3 to 20 EV|
|White Balance||Auto, Cloudy, Color Temperature, Custom, Daylight, Flash, Fluorescent (White), Shade, Tungsten|
|Continuous Shooting||Up to 8 fps at 30.3 MP for up to 47 Frames (Raw) / 100 Frames (JPEG)
Up to 3 fps at 30.3 MP for up to 47 Frames (Raw) / 100 Frames (JPEG)
Up to 2.2 fps at 30.3 MP for up to 47 Frames (Raw) / 100 Frames (JPEG)
UHD 4K (3840 x 2160) at 23.976p/24.00p/25p/29.97p
Full HD (1920 x 1080) at 23.976p/24.00p/25p/29.97p/50p/59.94p
HD (1280 x 720) at 25p/29.97p/50p/59.94p/100p/119.88p
|External Recording Modes||4:2:2 10-Bit
UHD 4K (3840 x 2160)
|Recording Limit||Up to 29 Minutes, 59 Seconds|
|Audio Recording||Built-In Microphone (Stereo)
External Microphone Input
|Audio File Format||AAC, Linear PCM (Stereo)|
|Focus Type||Auto and Manual Focus|
|Focus Mode||Continuous-Servo AF (C), Manual Focus (M), Single-Servo AF (S)|
|Autofocus Points||Phase Detection: 5655|
|Autofocus Sensitivity||-6 to +18 EV|
Viewfinder and Monitor
|Viewfinder Resolution||3,690,000 Dot|
|Viewfinder Eye Point||23 mm|
|Viewfinder Magnification||Approx. 0.71x|
|Diopter Adjustment||-4 to +2|
|Monitor Resolution||2,100,000 Dot|
|Monitor Type||Articulating Touchscreen LCD|
|Flash Modes||Flash On, Slow Sync|
|Flash Compensation||-3 to +3 EV (1/3, 1/2 EV Steps)|
|Dedicated Flash System||eTTL|
|External Flash Connection||Hot Shoe|
|Memory Card Slot||Single Slot: SD/SDHC/SDXC (UHS-II)|
|Connectivity||3.5mm Microphone, HDMI C (Mini), USB Type-C (USB 3.0)|
|Operating Temperature||32 to 104°F / 0 to 40°C|
|Operating Humidity||0 to 85%|
|Battery||1 x LP-E6N Rechargeable Lithium-Ion, 7.2 VDC, 1865 mAh|
|Dimensions (W x H x D)||5.3 x 3.9 x 3.3" / 135.8 x 98.3 x 84.4 mm|
|Weight||1.45 lb / 660 g (Body with Battery and Memory)|
|Package Weight||3.33 lb|
|Box Dimensions (LxWxH)||11.1 x 8.8 x 6"|
Based on the EOS R, the EOS Ra is an astrophotography-dedicated camera that differs from its general-use sibling in a number of ways to better enable photographing the night sky:
Beginning with the lens mount, the EOS Ra supports Canon's line of RF-mount lenses. This mount is characterized by its wide 54mm diameter and short 20mm flange-back distance, which promotes the ability to design lenses that are both faster and smaller than their SLR equivalents. The mount also incorporates a 12-pin electronic contact system for more sophisticated autofocus and image stabilization capabilities. This mount design also lends full compatibility to existing EF and EF-S-mount lenses via an optional EF-EOS R Mount Adapter.
A large 30.3MP full-frame CMOS sensor is featured and serves as an ideal balance between high-resolution output, low-light performance, and high-speed capabilities. When paired with the DIGIC 8 image processor, the EOS Ra affords a native sensitivity range of ISO 100-40000, which can be expanded to ISO 50-102400 for working in a variety of lighting conditions. Quick continuous shooting to 8 fps is also supported for photographing moving subjects.
Dual Pixel CMOS AF offers smooth and fast focusing performance in a similar manner to how a camcorder acquires focus. This system integrates two separate photodiodes within each pixel to provide a broad and dense network of 5655 phase-detection gathering elements across a majority of the image sensor to reduce focus hunting for faster, more direct control of focus placement. When working with still imagery, this focusing system works to acquire focus quickly and accurately, making it ideally suited to shooting and tracking moving subjects so that critical focus is attained with each shot. When shooting video, a Movie Servo AF mode offers smooth and natural focusing when changing from different subjects or different distances within the scene, as well as the ability to specify tracking sensitivity, AF speed, and Face Tracking priority. Benefited by the Touch AF system, rack focus is possible simply by touching elements within the scene on the touchscreen in order to change focus in an intuitive manner. Subject tracking in movies is also heightened due to the Dual Pixel CMOS AF system's ability to recognize subjects and maintain focus when working within changing or cluttered scenery. Additionally, the focus system is sensitive down to EV -6 for working in truly low-light conditions with accurate AF capabilities.
Designed for multimedia image-maker, the EOS Ra supports UHD 4K (3840 x 2160) resolution recording at up to 30 fps at 480 Mb/s, along with Full HD 1080p shooting at 60 fps and HD 720p at 120 fps for slow motion playback. When recording in-camera, 4K video has 4:2:2 sampling and 8-bit color depth, a 4:2:2 10-bit clean output in ITU-R CT.2020 is possible when using an external recorder.
Integrated Canon Log also allows users to capture flat images with an improved dynamic range of 800%, or 12 stops. This function makes it easier to match cameras in post-production as well as provides the most latitude and potential for color grading. For monitoring, a View Assist function is available, which emulates a graded look for more accurate viewing on the camera's LCD.
Audio can be recorded using the on-board stereo microphone or an optional external mic can also be used via the 3.5mm mic jack.
First introduced with the EOS 5D Mark IV, Dual Pixel RAW allows photographers to record all the information the sensor's unique pixel architecture can deliver, providing a way for fine adjustments to be made after the image is taken. These adjustments include focus fine tuning that can help you ever-so-slightly adjust the focus point to bring out extra details, shift bokeh around for improved composition, and reduce the impact of ghosting on your photos. This requires the use of Canon's Digital Photo Professional software.