Archived posting to the Leica Users Group, 2008/04/20

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Subject: [Leica] Noctilux DOF Film vs M8
From: faneuil at gmail.com (Eric Korenman)
Date: Sun Apr 20 07:58:28 2008
References: <D66AF68A-F211-47AA-A589-492C18022D56@comcast.net> <77F7A2BB-2C7C-481D-860C-6C16A64EBF2F@cox.net> <F4AC3CA3-EC3D-4D43-BEBB-12FE0D13FA4C@comcast.net>

My noct is coming back from Germany this week. Wish me luck.
Leica claimed that adding the 6 bit coding ring would 'shim' it
slightly and improve focusing with my m8.

here's to sharp eyes and soft ears,
Eric

On Sun, Apr 20, 2008 at 10:31 AM, Leonard Taupier <len-1@comcast.net> wrote:
> Hi Steve,
>
>  Don didn't ask for my M8, just the lenses. He still has them and I would
> expect for awhile as he's pretty busy.  Others on the Camera forum have 
> done
> the same thing and report very good results.
>
>  Len
>
>
>
>
>  On Apr 20, 2008, at 10:15 AM, Steve Barbour wrote:
>
>
> >
> > On Apr 20, 2008, at 6:46 AM, Leonard Taupier wrote:
> >
> >
> > > This is a very interesting issue. I don't know if anybody has mentioned
> what happens to the depth of field of the Noctilux, or any other lens, in a
> Leica film camera versus the M8 digital camera. It seems that nobody
> complains about the focus on a film body but all kinds of complaints on the
> M8, especially the Noctilux, Summilux Asph and the 75mm Summilux. Is there 
> a
> difference? Yup, there sure is. I tested 16 leica lenses for depth of field
> at a distance of 8 feet. I tested 13 of the lenses with film using a .85 MP
> and compared the results to those taken with an M8 and a 1.25 Leica
> magnifier.
> > >
> > > In every case the DOF shifts away from the camera with the M8. In other
> words the lens appears to back focus. The worse lens for this shift is the
> Noctilux. But even on a film camera it is barely in focus. The typical back
> focus shift of any 50mm Leica lens is about 4 to 5 inches at 8 feet with 
> the
> M8. The backward shift of the Noctilux is between 8 and 9 inches. This puts
> the focused point of the rangefinder outside the depth of field of the 
> lens.
> The other thing I noticed is the DOF is better centered on the older LTM
> lenses then on the newer lenses. I don't know if this is a quality control
> problem now or if the focus point test has changed. I tested 7 LTM lenses,
> the Xenon, Summarit, Summitar, Summicron Coll, 50 Elmar RS, 90 Elmar and 
> 135
> Hektor. The focus point nicely stayed within the DOF on both cameras. Of 
> the
> M lenses the best is the 1st 50mm Summicron rigid version followed by the
> current 50mm Summicron.
> > >
> > > I verified my results with a second M8. The MP body is one year old and
> purchased new. I also sent my Noctilux and 75mm Summilux to DAG for focus
> adjustment even though the lens is still in warranty. I'm also shooting 
> more
> with film these days.
> > >
> >
> > hi Len,
> >
> > is it appropriate to send a Noctilux to DAG for focus adjustment, without
> the body...
> >
> > does that work out OK?
> >
> > I agree that with film (bodies) I did fine with the Noctilux wide open,
> with the M8 much less so...
> >
> > Steve
> >
> >
> >
> > >
> > >
> > > Len
> > >
> > >
> > >
> > > _______________________________________________
> > > Leica Users Group.
> > > See http://leica-users.org/mailman/listinfo/lug for more information
> > >
> >
> > best, Steve
> >
> >
> > "I never wanted to be famous"
> > http://www.blurb.com/bookstore/detail/186890
> >
> >
> > _______________________________________________
> > Leica Users Group.
> > See http://leica-users.org/mailman/listinfo/lug for more information
> >
>
>
>  _______________________________________________
>  Leica Users Group.
>  See http://leica-users.org/mailman/listinfo/lug for more information
>

Replies: Reply from len-1 at comcast.net (Leonard Taupier) ([Leica] Noctilux DOF Film vs M8)
Reply from kididdoc at cox.net (Steve Barbour) ([Leica] Noctilux DOF Film vs M8)
In reply to: Message from len-1 at comcast.net (Leonard Taupier) ([Leica] Noctilux DOF Film vs M8)
Message from kididdoc at cox.net (Steve Barbour) ([Leica] Noctilux DOF Film vs M8)
Message from len-1 at comcast.net (Leonard Taupier) ([Leica] Noctilux DOF Film vs M8)