Canon EOS Ra (2019)
A full-frame mirrorless camera optimized 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 designed specifically for astrophotography. Announced on November 5, 2019, and scheduled for availability in mid-December 2019, it is the astronomical version of the Canon EOS R. The camera features modifications that enhance its sensitivity to the 656.28 nanometer H-Alpha wavelength, making it particularly effective for capturing deep space nebulosity. It retains most core features of the EOS R but is tailored 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 and includes a modified sensor filter stack that increases transmission of the H-Alpha line. However, this design has been reported to generate strong red halo reflections around bright light sources, with some units requiring 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, positioned as the astro version of Canon's top mirrorless model. It was developed to serve deep space astrophotographers and astro landscape photographers seeking enhanced 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. It has been noted in user forums and reviews for its excellent low-light image quality and tangible improvement in capturing colorful H-alpha nebulosity, though design issues with red halos have been reported.
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