Crop Factor, Low Light and Aperture with m4/3 lenses?

Started Jun 15, 2014 | Discussions thread
baxters Veteran Member • Posts: 5,157
Re: Crop Factor, Low Light and Aperture with m4/3 lenses?

The crop factor is 2. That is why there is an Olympus 25mm f1.8 and a Panasonic 25mm f1.4. Both correspond to a 50mm lens on film.  For exposure, the aperture is unchanged by crop factor. Both of these lenses will act like your 50mm f1.7 lens for focal length and exposure.

Depth of field (DOF) calculations do require you to multiply the aperture by 2. So if you like to calculate  where a lens will start to go out of focus for blurred backgrounds, you will get less DOF in theory. In practice, you could show this in a lab. Out on the street, you could probably shoot someone with your 50 f1.7 on film or the 25mm f1.8 on an EM10 and both backgrounds will look the same because they are both far enough away.

The light sensitivity of digital cameras is far better than film. Any low light shooting you did with your 50mm f1.7 on film will be easily matched by the two above lenses on the EM10.

By the way, you can use your film lenses on the EM10.

 baxters's gear list:baxters's gear list
Panasonic Lumix DMC-GM1 Olympus Zuiko Digital ED 70-300mm 1:4.0-5.6
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