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
Author/Publisher: The SLR Compendium - http://www.blurb.com/books/3732813
On 23/01/2013, at 12:30 AM, Frank Wijsmuller wrote:
> 25mm/0,95 on (m)4/3 is like 50mm ~1.9 (add 2 stops, or multiply by 2).
> Thin, but not spectacular so (we did it all the time with our 50mm 1.8's ;-)
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