What is the crop factor of the Sony A77?

The Sony Alpha SLT-A77 is equipped with an APS-C sensor, whose diagonal measures 28.2mm. The sensor has a crop factor (or format factor, or focal length multiplier) of 1.5.

The crop factor is defined as the ratio of the 35mm full-frame film diagonal to the diagonal of a digital sensor. This number indicates how a lens behaves in relation to the size of the image sensor.

Sensor size comparison with a film slide

With a crop factor of 1.5, the sensor in the Sony A77 is smaller than the receptor area of a 35mm film slide or negative. As a result, a lens that is attached to the Sony A77 will offer a narrower angle of view and provide deeper depth of field than a lens of similar focal length and aperture on a film camera. The equivalent focal length is obtained by multiplying the actual focal length of the lens with the crop factor. For example, a 33mm lens on the Sony A77 will provide the same angle of view and depth of field as a 50mm normal lens on a film camera (33mm * 1.5 = 50mm).

Sensor specs and performance

The table below compares the sensor specs of the Sony A77 to those of several similar cameras. The reported DXO values are indicators of the sensor's imaging quality (higher is better), covering color depth (DXO Portrait), dynamic range (DXO Landscape), and high-ISO noise (DXO Sports). Larger sensor cameras tend to outperform cameras of the same generation that are equipped with a smaller imager. On the other hand, larger sensors are more expensive and require bigger and heavier lenses than smaller light receptors.

Sensor Characteristics

		Camera Model	Sensor Class	Resolution (MP)	Horiz. Pixels	Vert. Pixels	Video Format	DXO Portrait	DXO Landscape	DXO Sports	DXO Overall
1.		Sony A77	APS-C	24.0	6000	4000	1080/60p	24.0	13.2	801	78
2.		Canon 6D	Full Frame	20.0	5472	3648	1080/30p	23.8	12.1	2340	82
3.		Panasonic GH5	Four Thirds	20.2	5184	3888	4K/60p	23.9	13.0	807	77
4.		Pentax K-3	APS-C	24.1	6016	4000	1080/60i	23.7	13.4	1216	80
5.		Sony A7 II	Full Frame	24.0	6000	4000	1080/60p	24.9	13.6	2449	90
6.		Sony A9	Full Frame	24.0	6000	4000	4K/30p	24.9	13.3	3517	92
7.		Sony A68	APS-C	24.0	6000	4000	1080/60i	24.1	13.5	701	79
8.		Sony A77 II	APS-C	24.0	6000	4000	1080/60p	24.4	13.4	1013	82
9.		Sony A99	Full Frame	24.0	6000	4000	1080/60p	25.0	14.0	1555	89
10.		Sony A6500	APS-C	24.0	6000	4000	4K/30p	24.5	13.7	1405	85
11.		Sony A6600	APS-C	24.0	6000	4000	4K/30p	23.8	13.4	1497	82

In the United States, the A77 was initially launched in August 2011 at a price of $1,399.

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Camera to camera comparisons

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