Archived posting to the Leica Users Group, 2008/05/03

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Subject: [Leica] Update: My Noctilux back from world travels. Looks tan and happy!
From: faneuil at gmail.com (Eric Korenman)
Date: Sat May 3 08:28:21 2008

My noctilux just got back from Germany.
It now has a spiffy 6 bit code ring to prove it.

results: Absolutely spot-on focus at f 1.0 on my M8
higher apertures still result in drifting back focus (but I didn't
expect them to regrind the lenses..)

so I am happy.
Whatever they did (likely the shimming by the 6 bit code ring) helped.
No more hex key monkeying with the M8's cam for me.

Eric

On Sun, Apr 20, 2008 at 10:58 AM, Eric Korenman <faneuil@gmail.com> wrote:
> 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 editor at frontenachouse.com (editor@frontenachouse.com) ([Leica] Update: My Noctilux back from world travels. Looks tan andhappy!)