What's the full frame equvialance of this phone lens?

Question

I took a photo with my phone, and here is the EXIF:

F/2 4mm 1/14s ISO-1250

I searched on the Internet and found that the sensor is Sony IMX134, 1/4 inch. Then how to calculate the equivalent focal length of this lens?

(The equivalent focal lens of an APS-C lens is about 1.5 of the focal length. For example, a 35mm lens is equivalent to 52.5mm full frame.)

Henk Holterman · Accepted Answer · 2015-03-22 08:19:43Z

1

The crop-factor is specified as 9.42.

So you have a 4 x 9.42 = 38mm equivalent lens.

Apparently, that "Type 1/4 sensor" has to be taken with a grain of salt. The diagonal seems to be 0.18", closer to 1/5.

answered Mar 22, 2015 at 8:03

Henk Holterman

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\$\begingroup\$ Thank you very much indeed! According to your figure, I guess I can take this lens as a standard prime (about 50mm). \$\endgroup\$
– Nick
Commented Mar 22, 2015 at 10:10
\$\begingroup\$ It's a little wider than standard, the usual range for that is 43-50 mm. But yes, it's close and less wide than most phonecams that I'm aware of. \$\endgroup\$
– Henk Holterman
Commented Mar 22, 2015 at 10:18

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