OM System OM-1 vs Sony A1
Side-by-side used price and spec comparison. Lowest current prices pulled daily from the major used-gear sites.
Today's price sits in the middle of its recent range. The 90-day window runs from $768 to roughly today's $854. 39% of the $2,199 MSRP. Prices are down 25.0% over the last 30 days.
Today's price sits in the middle of its recent range. The 90-day window runs from $2,500 to roughly today's $2,692. 41% of the $6,499 MSRP. Prices are down 3.8% over the last 30 days.
Quick answers
- Which is cheaper used, the OM System OM-1 or the Sony A1?
- The OM System OM-1 is cheaper used: $854 against $2,692 for the Sony A1, a gap of $1,838 (215%) as of 2026-10-30.
- Why is the older Sony A1 more expensive used than the OM System OM-1?
- It is, by $1,838: $2,692 against $854 for the newer OM System OM-1 as of 2026-10-30, with 19 and 24 live listings. When an older model holds a premium, buyers usually prefer something it does that its successor changed, or the newer model is still sold new, which keeps pressure on its used price.
- What share of its launch price does a used OM System OM-1 cost?
- About 39%: $854 used against a $2,199 launch price as of 2026-10-30.
- Which is smaller, the OM System OM-1 or the Sony A1?
- The OM System OM-1 is smaller: the Sony A1 is 6 mm narrower, 5 mm taller, 8 mm deeper and 138 g heavier.
Size and weight
The Sony A1 is 6 mm narrower, 5 mm taller, 8 mm deeper and 138 g heavier than the OM System OM-1.
| Measurement | OM System OM-1 | A1 | Difference |
|---|---|---|---|
| Width | 135 mm | 129 mm −6 mm | A1 is 6 mm narrower |
| Height | 92 mm | 97 mm +5 mm | A1 is 5 mm taller |
| Depth | 73 mm | 81 mm +8 mm | A1 is 8 mm deeper |
| Weight | 599 g | 737 g +138 g | A1 is 138 g heavier (23%) |
Drawn to scale from manufacturer dimensions. Body only: lenses not included. Outlines are simplified shapes, not product drawings.
Specs side by side
| OM System OM-1 | Sony A1 | |
|---|---|---|
| Brand | Olympus | Sony |
| Family | OM System OM | Sony Alpha |
| Category | body | body |
| Body type | Mirrorless | Mirrorless |
| Mount | MFT | Sony FE |
| Sensor | MFT | Full Frame |
| Sensor family | OM 20MP stacked Four Thirds Live MOS (OM-1) · 20MP Four Thirds stacked BSI Live MOS | Sony FF 50MP stacked (A1/A1 II) · 50.1MP full-frame Exmor RS stacked CMOS |
| Megapixels | 20.4 MP | 50.1 MP |
| Autofocus | Hybrid | Hybrid |
| IBIS | 5-axis 7-stop | 5-axis 5.5-stop |
| Weather sealed | Yes | Yes |
| Max video | 4K60 | 8K30 |
| Max native ISO | ISO 25,600 | ISO 32,000 |
| Body weight | 599 g | 737 g |
| Dimensions | 135 × 92 × 73 mm | 129 × 97 × 81 mm |
| Body material | magnesium alloy | magnesium alloy |
| Released | 2022-03-18 | 2021-01-26 |
| Discontinued | — | — |
| Status | current | current |
| MSRP | $2,199 | $6,499 |
| Current low | $854 | $2,692 |
| vs MSRP | -61% | -59% |
Dynamic range, head to head
Both sensors plotted on one chart, across the full ISO range. The higher line holds more shadow-to-highlight latitude at that ISO.
Overlay both curves on Photons to PhotosMeasurements by William J. Claff. We link rather than reprint them.
Hands-on review
The verdicts above describe price timing. They don't tell you which camera fits your shooting style. See /methods for how we normalize seller conditions and compute the deal score.