This explains it nicely, and no (or not much) math involved; a boon for the
mathematically-challenged. ;-)
http://www.cambridgeincolour.com/tutorials/digital-camera-sensor-size.htm
Stick with whatever idea you want, but it will likely be wrong.
On 1/22/13 7:02 PM, "olympus-request@xxxxxxxxxxxxxxxxx"
<olympus-request@xxxxxxxxxxxxxxxxx> wrote:
> I keep running into this idea and I don't get it.
> Yes I'm sure that there's some nice mathematics to back it up but...
> I've use a lot of 50/1.8 lenses and I have used the CV 25/0.95.
> Believe me - the DOF on the 25 wide open on 4/3rds is VERY thin, far more so
> than a 50/1.8 on 35mm.
> I was reminded of struggling with an OM 50/1.2 on 35mm.
> So I won't be doing any adding or multiplying thanks, whatever the theory.
> f1.9 equivalent - ptui!
> I'll stick with the idea that the small sensor merely crops the image.
> The reduced focal length widens the DOF but the ultra wide aperture really
> reduces it a lot.
> Andrew Fildes
> afildes@xxxxxxxxxxxxx
> www.soultheft.com
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