Canon's astrophotography-specialised mirrorless — modified IR filter for hydrogen-alpha nebula capture.
The Canon EOS Ra was released in 2019 as an astrophotography-specialised variant of the EOS R, featuring a modified IR cut filter that transmits approximately 4× more H-alpha (656nm) light than the standard EOS R filter. The 30.3MP full-frame CMOS sensor and all other specifications are identical to the EOS R. 4K/30fps (1.8× crop). LP-E6N battery. At approximately 660g with battery.
30.3MP full-frame CMOS sensor — identical to EOS R. Modified IR cut filter: approximately 4× H-alpha transmission vs. standard EOS R. 4K/30fps (1.8× crop mode only; same 4K limitation as EOS R). 1080/60fps. LP-E6N battery. Approximately 660g with battery and card. Canon RF mount. Dual Pixel CMOS AF.
The Ra's H-alpha filter modification is the sole technical difference from the EOS R: emission nebulae radiate strongly at 656nm (H-alpha wavelength), but standard CMOS sensors suppress this wavelength via the IR cut filter to match human visual response. The Ra's modified filter enables accurate red nebula colour without requiring an aftermarket sensor modification. All other use cases — daylight photography, video — behave identically to the standard EOS R.
On the used market the Canon EOS Ra is available at a premium over the standard EOS R due to the dedicated astrophotography modification. Condition checks: sensor dust, LP-E6N battery health, RF mount contacts. The H-alpha modification makes this the Canon RF choice for emission nebula astrophotography. Compatible with all Canon RF-mount lenses.