Archived posting to the Leica Users Group, 2011/04/11

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Subject: [Leica] DOF of 80/1.4 at 1.4 slimmer than 50mm at 1.4?
From: Frank.Dernie at btinternet.com (Frank Dernie)
Date: Mon, 11 Apr 2011 13:35:59 +0100
References: <747098.9554.qm@web82101.mail.mud.yahoo.com> <BD38DC430E434F79B63832050B44DA53@jimnichols> <BANLkTinCi_aYvnyQwfM+g=DF=yB+4gFX4Q@mail.gmail.com> <BLU0-SMTP63FFBE73F8419F8D7EEA128CA80@phx.gbl>

On 11 Apr, 2011, at 12:41, Vick Ko wrote:

> Hello
> 
> I've been playing with my DMR with the 80mm f1.4.
> 
> I'm finding it a lot more difficult to use and capture proper focus at 
> f1.4 than I expected.
> 
> Is the dof of an 80mm at f1.4 thinner than the dof of a 50mm at f1.4?

Yes, noticeably.

> 
> And is this typical of what people found, using their rf 75mm Summiluxes - 
> very difficult to capture proper focus?

More difficult than a Noctilux, but not impossible.

> 
> I suppose it didn't help, trying to photograph a 7 month old boy, who 
> doesn't quite understand sitting still yet   :-)

Fast lenses wide open with children is a 1 in 50 strategy...

> 
> Vick
> 
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information

Frank



Replies: Reply from red735i at earthlink.net (Frank Filippone) ([Leica] DOF of 80/1.4 at 1.4 slimmer than 50mm at 1.4?)
Reply from lluisripollquerol at gmail.com (Lluis Ripoll) ([Leica] DOF of 80/1.4 at 1.4 slimmer than 50mm at 1.4?)
In reply to: Message from rgacpa at yahoo.com (Bob Adler) ([Leica] IMG: Foothill Park)
Message from jhnichols at lighttube.net (Jim Nichols) ([Leica] IMG: Foothill Park)
Message from richard at imagecraft.com (Richard Man) ([Leica] IMG: Foothill Park)
Message from vick.ko at sympatico.ca (Vick Ko) ([Leica] DOF of 80/1.4 at 1.4 slimmer than 50mm at 1.4?)