Sony a1 II
Real Sensor Data
- Brand
- Sony
- Sensor Format
- Full Frame
- Resolution
- 50.1 MP
- Pixel Pitch
- 4.15 microns
- Circle of Confusion
- 0.0288 mm
- Crop Factor
- 1.00x
- Announced
- 2024
The a1 II, released in 2024, is a rare case on this reference of a manufacturer refreshing a flagship body without touching its core sensor at all — the 50.1-megapixel stacked full-frame chip carries over unchanged from the original 2021 a1, with Sony's updates instead concentrated on autofocus processing (borrowed from the newer a9 III), a fully articulating screen, and refined ergonomics.
Sony a1 II sensor specs
- Sensor
- Full Frame
- Resolution
- 50.1 MP
- Pixel dimensions
- 8,669 × 5,779 px
- Aspect ratio
- 3:2
- Pixel pitch
- 4.15 µm
- Crop factor
- 1.00x
- Circle of confusion
- 0.0288 mm
Full Frame sensor · DoF & Hyperfocal Calculator · Astro 500/NPF Calculator
Reusing the identical sensor means every depth-of-field, hyperfocal and astro-shutter-speed figure on this page applies equally to the original a1 — a genuine case where a full model generation passed without any change to the core imaging chip at all, unusual for a flagship refresh cycle.
Sony also carried the a9 III's AI-processing autofocus chip into the a1 II, a genuine capability upgrade over the original a1's autofocus system despite the unchanged core sensor. A real, meaningful autofocus upgrade. A real, tangible tracking improvement.
See these numbers used live in the DoF & Hyperfocal Calculator by selecting the Full Frame sensor format.
Frequently Asked Questions
Is there any reason to buy the a1 II over a cheaper original a1 for image quality?
Not for sensor performance specifically — they share the identical 50.1-megapixel sensor, so resolution, depth of field and astro shutter-speed math are the same on both. The a1 II's real upgrades are in autofocus tracking and handling, which matter for many photographers but aren't sensor-level differences.