New Canon camera 22mm lems - shallow depth of field vs Pany 20mm?

Started Jul 23, 2012 | Discussions thread
Great Bustard Forum Pro • Posts: 39,307
Re: Very simple.

tt321 wrote:

Great Bustard wrote:

correos wrote:

Hi there, I'm wondering about the shallow depth of field trade off between aperture and sensor size. The new canon ILC has apparently an APS-C sensor and will come wth a 22mm f2 lens. How would depth of field compare with a m43 sensor with the Panasonic 20mm f1.7? The latter has about a third stop faster aperture, but the Canon has a substantially larger sensor. Any idea how this would affect dof?

The sensor ratio (crop factor) from mFT to 1.6x (Canon APS-C) is 1.24. So, 20mm f/1.7 on mFT is equivalent to 25mm f/2.1 on Canon APS-C, which is pretty freakin' close.

If you crop the Canon to 4:3, then the sensor ratio is 1.15. So 20mm f/1.7 on mFT is equivalent to 23mm f/1.9 on Canon APS-C -- even more freakin' close.

What if you crop the M4/3 to 3:2?

Just as simple: you take the ratio of the sensor lengths (as opposed to the ratio of sensor heights for cropping 3:2 to 4:3): 22.3mm / 17.3mm = 1.29. So, 20mm f/1.7 on mFT cropped to 3:2 is equivalent to 26mm f/2.2 on Canon APS-C.

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