Canon EOS R5 Mark II
vs Sony a1
vs
Both builds use the Sigma 18-35mm f/1.8 Art so you can pin one and flip the body in the simulator.
| Canon EOS R5 Mark II | Sony a1 | |
|---|---|---|
| Sensor size | 36 × 24 mm | 35.9 × 24 mm |
| Crop factor | 1× | 1× |
| Sensor class | Full Frame | Full Frame |
| Native mount | RF | E |
| Aspect modes | 3:2 · 16:9 | 3:2 · 16:9 |
| Released | 2024 | 2021 |
Both bodies share a 1× crop, so any lens frames identically on each — the choice comes down to codec, body and workflow, not field of view.
| Lens focal | EOS R5 Mark II (1×) | a1 (1×) |
|---|---|---|
| 16mm | 16mm · 96.7° | 16mm · 96.6° |
| 24mm | 24mm · 73.7° | 24mm · 73.6° |
| 35mm | 35mm · 54.4° | 35mm · 54.3° |
| 50mm | 50mm · 39.6° | 50mm · 39.5° |
| 85mm | 85mm · 23.9° | 85mm · 23.8° |
What's the crop-factor difference between the EOS R5 Mark II and the a1?
The EOS R5 Mark II is 1× and the a1 is 1×. They share the same crop factor, so a given lens frames identically on both.
Do the EOS R5 Mark II and a1 use the same lenses?
Not natively — the EOS R5 Mark II is RF and the a1 is E. focalcomp's registry shows which adapters bridge them.
Which is wider, the EOS R5 Mark II or the a1?
Neither — identical crop factors mean identical framing with the same lens.