Full frame vs APS-C: what is the real difference?
Sensor size affects low light, depth of field, lens choice and price. A clear comparison using the Sony A7R V and α6700.
Full-frame sensors measure about 36 × 24 mm, the size of 35mm film. APS-C sensors are smaller, about 23.5 × 15.6 mm.
Crop factor
APS-C has a 1.5x crop factor on Sony. A 50mm lens on the α6700 gives a field of view similar to 75mm on full frame. This helps wildlife and sports reach.
Low light and dynamic range
Full-frame sensors generally produce cleaner images at high ISO and slightly more dynamic range.
Depth of field
At the same framing and aperture, full frame produces shallower depth of field, giving stronger background blur.
Resolution
The A7R V’s 61 megapixels allow huge prints and heavy cropping. The α6700’s 26 megapixels are plenty for most web and print uses.
Size, weight and cost
APS-C bodies and lenses are smaller, lighter and cheaper, ideal for travel and video rigs.
Which to choose
- Landscapes, real estate, studio and weddings: full frame
- Travel, vlogging, wildlife reach and budget builds: APS-C
Both use Sony E-mount, so many lenses work on both.
