cameracomparison · 2-way
Canon EOS 90D vs Canon EOS Ra Mark II
Canon
EOS 90D
A strong fit for photographers stepping into astro pairing with a broad range of focal lengths.
Canon
EOS Ra Mark II
A strong fit for photographers stepping into astro pairing with wide-field refractors.
Key differences
-38% larger sensor
Finer pixels (3.2µm vs 4.4µm)
-27% more resolution
Specifications
| Specification | Canon EOS 90D | Canon EOS Ra Mark II |
|---|---|---|
| Sensor | ||
| Type | dslr | dslr |
| Sensor | Canon APS-C | Canon FF astro |
| Sensor tech | CMOS | CMOS |
| Format | APS-C | Full frame |
| Sensor size | 22.3×14.8mm | 36.0×24.0mm |
| Diagonal | 26.8mm | 43.3mm |
| Pixel size | 3.20µm | 4.40µm |
| Resolution | 6960×4640 | 8192×5464 |
| Megapixels | 32.5MP | 44.8MP |
| Color | Yes | Yes |
| Cooling | ||
| Cooled | No | No |
| Performance | ||
| Full well | — | — |
| Peak QE | — | — |
Advantages of Canon EOS 90D
- Finer sampling at 3.2µm pixels
Advantages of Canon EOS Ra Mark II
- Larger sensor (43.3mm vs 26.8mm diagonal) — wider field
- Larger pixels — better low-light per-pixel sensitivity
- Higher resolution (44.8MP vs 32.5MP)
Best for — Canon EOS 90D
- Balanced field for most refractors
- Well-sampled deep-sky at medium focal lengths
- One-shot color — quick results, less processing
Best for — Canon EOS Ra Mark II
- Wide-field mosaics and full-frame telescopes
- Fast, low-noise deep-sky at short focal lengths
- One-shot color — quick results, less processing
Canon EOS 90D — typical FOV & scale
- On 250mm refractor (wide)FOV: 5.11° × 3.39°Scale: 2.64"/px
- On 800mm SCT reducerFOV: 1.60° × 1.06°Scale: 0.83"/px
- On 2000mm SCT nativeFOV: 0.64° × 0.42°Scale: 0.33"/px
Canon EOS Ra Mark II — typical FOV & scale
- On 250mm refractor (wide)FOV: 8.25° × 5.50°Scale: 3.63"/px
- On 800mm SCT reducerFOV: 2.58° × 1.72°Scale: 1.13"/px
- On 2000mm SCT nativeFOV: 1.03° × 0.69°Scale: 0.45"/px
Canon EOS 90D — recommended user
A strong fit for photographers stepping into astro pairing with a broad range of focal lengths.
Canon EOS Ra Mark II — recommended user
A strong fit for photographers stepping into astro pairing with wide-field refractors.