Archived posting to the Leica Users Group, 1998/08/15

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Subject: Re: [Leica] 75/1.4 versus 90/2.0
From: Nathan Wajsman <nathan.wajsman@euronet.be>
Date: Sat, 15 Aug 1998 12:06:15 +0200

Fair point. Since Eastland does not show depth of field for the 75mm lens
below 1m, we can do something like this:

75mm at 1m: 0.993m to 1.006m (i.e. 1.3 cm)
90mm at 1.2m: 1.19m to 1.21m (i.e. 2 cm)

Both wide open, i.e. f1.4 for the 75mm and f2.0 for the 90mm.

In practice, this means that in either instance, if you focus on the pers=
on's
eyes, their ears and the tip of their nose will be out of focus.

Nathan

Raimo Korhonen wrote:

> Shallow yes - but if you are talking about portrait at 1 m with the 90 =
mm
> lens you must compare it with portrait at 0.83 m with the 75 mm lens
> because of the lower magnification of the shorter lens. What do the tab=
les
> say?
> Raimo
> photos at http://personal.inet.fi/private/raimo.korhonen
> nyt my=F6s suomeksi

- --
Nathan Wajsman
Overijse, Belgium

Photography page:  http://members.tripod.com/~belgiangator/index.html
Motorcycle page:  http://www.geocities.com/motorcity/downs/1704/index.htm=
l