Canon EOS Ra (2019)
A full-frame mirrorless camera for astrophotography, announced in late 2019 as a specialized variant of the EOS R.
Overview
The Canon EOS Ra is a full-frame mirrorless camera built for astrophotography. Canon announced it on November 5, 2019, with availability scheduled for mid-December 2019. It is the astronomical version of the Canon EOS R. The modifications make it more sensitive to the 656.28 nanometer H-Alpha wavelength, which helps with deep space nebulosity. Most of the core EOS R features carry over. The Ra is tuned for low-light, long-exposure imaging of the night sky.
Specifications
| Sensor | 30.3MP Full Frame CMOS |
| Live View feature | Offers 30x magnification in Live View for precise focus |
| IR filter | Modified to pass the 656.28 nanometer H-Alpha line at 4x transmission compared to standard filter |
| Dimensions (H x W x D) | 135.8 x 98.3 x 84.4mm |
| Weight | 1.46 lb (660g) (Body with Battery and Memory) |
| ISO Sensitivity | Auto 100–40000, expandable to L:50, H1:51200, H2:102400 |
| Movie Length | 4K and Full HD - Max duration 29min 59sec; no 4GB file limit with exFAT CF card |
| Original price | $2,499.00 (body only) |
Design
The EOS Ra is the first astro mirrorless camera with a 4K movie function. It has a modified sensor filter stack that increases transmission of the H-Alpha line. The design has been reported to produce strong red halo reflections around bright light sources, and some units needed warranty replacement of the entire sensor stack.
Context
The Canon EOS Ra is a specialized variant of the Canon EOS R full-frame mirrorless camera. It is positioned as the astro version of Canon's top mirrorless model. Canon developed it for deep space astrophotographers and astro landscape photographers who want more sensitivity to hydrogen-alpha emissions.
Market
The EOS Ra was offered at a discounted price of $2040.18 at the Canon Store with coupon codes. User forums and reviews note its excellent low-light image quality and a tangible improvement in capturing colorful H-alpha nebulosity. They also report the red halo design issues.
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