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

Started Jun 15, 2014 | Discussions thread
Just another Canon shooter
Just another Canon shooter Veteran Member • Posts: 4,691
Re: A picture is worth...

Anders W wrote:

Just another Canon shooter wrote:

Anders W wrote:

Yes it is. I compared ISO 3200 on MFT with ISO 12800 on FF, i.e., a two EV difference.

Wrong. ISO has nothing to do with EV.

Yes it does. Let me explain:

Suppose the MFT user can take a certain photo at 25 mm, f/2.8, 1/100 s, and ISO 3200. To capture the same photo, the FF user needs 50 mm, f/5.6, 1/100 s, and ISO 12800. Do you get it?

Remove the ISO from that, and you (and I) would be right.

Here is the formula for EV (wikipedia):

where

Do you see ISO there?

 Just another Canon shooter's gear list:Just another Canon shooter's gear list
Canon EOS 5D Mark II Canon EF 15mm f/2.8 Fisheye Canon EF 35mm F1.4L USM Canon EF 50mm f/1.2L USM Canon EF 135mm F2L USM +4 more
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