Canon has announced the launch of the EOS Ra, the latest in the line of EOS R full-frame mirrorless cameras. Designed specifically for astrophotography, the EOS Ra sports augmentations to aid astrophographers compose and capture in extremely low-light situations.
Compatibility with RF-mount lenses gives users access to a wide variety of Canon lenses, including EF/EF-S lenses with a separately-available EF-EOS R adapter. Its mirrorless design eliminates shutter shake caused by heavy moving parts – a key feature in low light and long exposures.
The EOS Ra sports a different, high-precision electronic viewfinder (EVF) that will help users compose accurately even with dim or distant difficult-to-see objects. A 30.3-megapixel full-frame CMOS sensor allows the EOS Ra to capture the most subtle of nuances with weak light or subtle shading. ISO performance also minimises noise even when higher sensitivity is demanded.
With a sensitivity range of ISO 100-40,000 for stills and ISO 100-25,600 for video (ISO 100-12,800 for 4K), the EOS Ra is designed specifically for low-light situations.
Its weight at only 660g makes it ideal for the hiking and climbing astrophotographers usually do. A Vari-angle tilting LCD allows users to comfortably frame their image even with the camera at awkward angles.
To optimise performance for astrophotography, the EOS Ra utilises an infrared cutoff filter for the CMOS sensor that maximises optical performance for the light wavelengths that are most useful. This enables the EOS Ra to boast approximately four times the sensitivity than the EOS R to Hα light wavelengths emitted by hydrogen atoms in stars. Images will capture deep red wavelengths emitted by nebulae without any adjustments.
Furthermore, the EOS Ra supports the ability to magnify live-view images by 5x and 30x as compared to the 5x and 10x of the EOS R. This enables a more critical analysis of small stars on the touch-sensitive monitor or EVF for more accurate adjustments in settings and focus.
Designed for outdoor use, the EOS Ra also sports the same dust and drip resistance of the EOS R.
For astrophotography, users might consider the RF15-35 F2.8L IS USM ultra-wide angle zoom lens with a constant wide aperture. EF lenses like the EF14mm f2.8L II USM and the EF24mm f1.4L USM can also be adapted to the EOS Ra. The separately-available Remote Switch RS-60E3 and Wireless Remote Control BR-E1 are also compatible with the EOS Ra – key tools for remote shooting to minimise camera shake.